# fourwalls

> building performance specialists


## Posts

- [New Role with the UK Centre for Moisture in Buildings (UKCMB)](https://fourwalls-uk.com/new-role-with-the-uk-centre-for-moisture-in-buildings-ukcmb/): I am delighted to share some news about a new part-time role I have recently taken on with the UK Centre for Moisture in Buildings (UKCMB). UKCMB has a clear and important mission: to ensure that moisture safety is placed at the heart of creating healthy, durable and low-carbon buildings. This is an area I have long been passionate about. My own work on building performance: from airtightness and ventilation through to indoor air quality and energy efficiency, has shown time and again that moisture is a hidden but critical factor. If you get it wrong, the consequences can be […]
- [Fire doors and ventilation air transfer: resolving a false conflict](https://fourwalls-uk.com/fire-doors-and-ventilation-air-transfer-resolving-a-false-conflict/): We are increasingly encountering a recurring issue: a perceived clash between ventilation air transfer requirements and fire door specifications – particularly in flats. We are finding that intended ventilation air paths are being blocked because air cannot transfer between rooms as designed. Internal fire doors are fitted tightly into their frames with minimal threshold clearance, leaving no effective air path. Ventilation systems, whether natural ventilation or, more commonly, MEV or MVHR, rely on those transfer paths to connect supply rooms (e.g. bedrooms and living areas) with extract rooms (e.g. kitchens and bathrooms). Without them, ventilation is restricted in the rooms […]
- [Airtightness: progress, but are we missing the point?](https://fourwalls-uk.com/airtightness-the-journey-so-far/): When I first became involved in shaping the airtightness requirements for Part L of the Building Regulations, the topic was treated as a specialist curiosity. Airtightness was often seen as a compliance hurdle rather than a fundamental element of energy efficiency, comfort, and building durability. Over the last two decades, the industry has come a long way. New homes are now tested, airtightness targets are clearly defined, and there is a growing supply chain of testers and products designed to make compliance achievable. In many respects, this is a positive story: UK homes are significantly more airtight than they were […]
- [Ventilation policy: A reflection on progress and the road ahead](https://fourwalls-uk.com/ventilation-policy-a-reflection-on-progress-and-the-road-ahead/): I have worked in building performance for over 30 years, and since 2008 have been closely involved in shaping ventilation policy in England and Wales. Having contributed directly to the 2010 and 2021 editions of Approved Document F, I have seen first-hand how regulation has evolved to respond to tighter fabric standards and the drive to cut greenhouse gas emissions, lately net-zero. 2010: A step change The 2010 edition of AD F was the first to make an explicit connection between airtightness and ventilation system choice. The principle was clear: as buildings become tighter, reliance on infiltration is not acceptable. […]
- [CIBSE Building Performance Awards 2025](https://fourwalls-uk.com/cibse-building-performance-awards-2025/): Four Walls Consultants Director, Ian Mawditt, Appointed Judge for CIBSE Building Performance Awards 2025 We are delighted to announce that Ian Mawditt, Director of Four Walls Consultants, has been selected as a judge for the prestigious Chartered Institution of Building Services Engineers (CIBSE) Building Performance Awards 2025. Ian’s experience in building performance evaluation and commitment to sustainable building practices are among the reasons he has been appointed to the judging panel. Reflecting on this appointment, Ian said, “It’s an honour to contribute to an institution that sets the benchmark for excellence in building performance and to be appointed among such […]
- [Our retrofit featured in CIBSE Retrofit Revisit Report](https://fourwalls-uk.com/our-retrofit-featured-in-cibse-retrofit-revisit-report/): We’re pleased to share Four Walls Consultants’ involvement in the Chartered Institution of Building Services Engineers (CIBSE) Retrofit Revisit Report. This study revisits ten homes across the UK, including “Blaise Castle,” the home of Four Walls director Ian Mawditt, to assess the long-term effectiveness of energy retrofit measures. The report highlights crucial findings that offer insights into improving energy performance and sustainability in residential properties. Key Findings of the Study The CIBSE study re-examined various retrofit strategies implemented over recent years to gauge their impact on energy efficiency, indoor comfort, and carbon reduction. It provided an insight into how these […]
- [Building for 2050 at Futurebuild 2022](https://fourwalls-uk.com/building-for-2050-at-futurebuild-2022/): The Building for 2050 team will be presenting their findings and launching the final film from the Building for 2050 project.
- [Approved Documents for Parts L, F and O 2021 now out](https://fourwalls-uk.com/parts-l-f-and-o-now-out/): Four Walls Consultants have been working with AECOM over the last three years helping to provide strategic and technical support to DLUHC in its development of the changes to Part L (conservation of fuel and power) and Part F (ventilation) of the Building Regulations and the introduction of Part O (overheating). The changes will significantly improve the energy efficiency of the buildings and are an important step on the pathway towards the government’s Future Homes and Buildings Standards. Ian Mawditt at Fourwalls is the technical lead for the changes in Part F, and for the building fabric and airtightness aspects […]
- [Working with Oxford City Housing Ltd](https://fourwalls-uk.com/working-with-oxford-city-housing-ltd/): Cambridge Energy is working with Oxford City Council’s wholly-owned housing company, Oxford City Housing Ltd as Energy Quality Auditors to help them meet their minimum target of 70% improvement over current carbon emission reduction targets (Part L 2013). Four Walls are associates of Cambridge Energy, and Ian has been working alongside Dr Jason Palmer to help deliver this work. The Energy Quality Auditor role includes oversight of the design process at pre-planning all the way through construction. This means rigorous reviews of the design proposals, including energy models; construction stage site inspections and post-construction testing. Most developments are currently at […]
- [Fourwalls appointed on Building for 2050 research project](https://fourwalls-uk.com/fourwalls-appointed-building-2050-research-project/): Fourwalls has been appointed as part of the team led by AECOM to support the Department for Business, Energy and Industrial Strategy (BEIS) to help deliver ground-breaking research relating to low cost, low carbon new build housing: Building for 2050. Fourwalls will provide the Building Performance Evaluation element of this project, launched by the government this month. Led by Ian Mawditt, Fourwalls role will be to lead the post-construction performance testing and 12-month energy and comfort performance of the study properties. Fourwalls will be working with AECOM and other consultants Pollard Thomas Edwards Architects and Delta Energy & Environment to […]
- [UK Centre for Moisture in Buildings re-launches](https://fourwalls-uk.com/uk-centre-moisture-buildings-relaunches/): On 20 October, the UK Centre for Moisture in Buildings (UKCMB) hosted a successful re-launch event. Over a hundred experts joined the conference to hear about the UKCMB’s latest research outputs, videos and tools. UKCMB discussed plans for the new training programme and other upcoming activities. Ian Mawditt from fourwalls co-chairs the technical working group for ventilation, airtightness and moisture in buildings alongside Prof. Tim Sharpe from MEARU at GSA. Our TWG will be coordinating activities and scoping studies in this area soon. For further information about the re-launch and to see the presentations from the day, go to the […]
- [STBA-SPAB Conference 13th June, London](https://fourwalls-uk.com/stba-spab-conference-sustainability-traditional-buildings/): Register now for the STBA-SPAB Conference on 13 June 2017, which will be focusing on the sustainability of traditional buildings. This year the conference will explore a much broader agenda, based around three themes: Context relates to the existing regulatory and policy framework for the built environment, but also to our understanding of sustainability – as most current definitions fail to include health or heritage and thus lead to false oppositions and unintended consequences. Continuity highlights the importance of maintenance in achieving dry, healthy and functioning (i.e. sustainable) buildings, the recording and valuing of heritage on “low status” buildings, and reducing the […]
- [Register for the HEMAC sandpit event, Glasgow](https://fourwalls-uk.com/hemac-sandpit-event/): The HEMAC (Health Effects of Modern Airtight Construction) network are holding a sandpit event on 25th April 2017 at The Glasgow School of Art. The aim of the event is to determine key research needs and identify opportunities for funding applications for cross-disciplinary projects, building on the outcomes of the previous activities. It is hoped that the sandpit event will assist with the development of novel research projects (with strong leadership from architectural design) by allowing participants to brainstorm and refine ideas for collaborations under the theme of ‘healthy buildings’. If you are interested in attending the event, please visit the HEMAC web-page for registration and […]
- [UKIEG Conference 26th April, Glasgow](https://fourwalls-uk.com/ukieg-conference-26th-april-glasgow/): This conference, hosted and supported by the HEMAC network and the Mackintosh Environmental Architecture Research Unit at the Glasgow School of Art, brings together research and case studies to help shed light on this important topic. The conference will include invited speakers, presentations and discussion, a poster session and networking opportunities. Ian Mawditt will be presenting findings from the MVHR meta-study, which was published in 2016. The focus of this presentation will be in relation to design-stage decisions that have a bearing on the performance of MVHR ventilation. For further conference details, visit the UKIEG web page.
- [PCA Conference 4th May, Coventry](https://fourwalls-uk.com/pca-conference-4th-may-coventry/): This year’s conference will explore areas where there are significant current and upcoming challenges and opportunities for the industry. Ian Mawditt from fourwalls will be presenting on ventilation and IAQ – how to evaluate and deal with the problems. See PCA website for booking details. Session 1 – Current and future challenges faced by industry Themes: Retrofit / Challenges faced by residential surveyors / Property Level Protection (PLP) and its adoption Session 2 – Ventilation & Indoor Air Quality Themes: The problems we are facing / How to evaluate and deal with the problems / PCA & Knowledge Transfer Partnership Session 3 – […]
- [Indoor air quality, airtightness and ventilation](https://fourwalls-uk.com/indoor-air-quality-airtightness-ventilation/): Book now for this very well-received event with a panel of expert speakers. Free Zero Carbon Hub guides x 4 for all attendees! Does an airtight building result in an unhealthy internal environment? What are the health consequences of poor indoor air quality? What ventilation solutions are there to protect the occupants? Indoor air quality, airtightness and ventilation – a challenging balancing act In the past, under-ventilation of buildings was not seen to be much of an issue due to the unintended gaps in the external envelope providing plenty of fresh air to the occupants. However due to improved workmanship, […]
- [ASBP Healthy Buildings Conference and Expo](https://fourwalls-uk.com/1134-2/): Building products can have a considerable impact on the health of building occupants as well as on the natural environment and on the people and communities impacted by the manufacturing process. Consequently, sustainable products must be healthy products. This Conference, organised by the Alliance for Sustainable Building Products will help delegates to both conceive of and design healthier buildings and to maximise the opportunities of more informed product selection. Ian Mawditt from fourwalls will be speaking at this event on 15th February 2017. Come and see his presentation: Can we rely on good ventilation? IAQ and ventilation effectiveness, which will […]
- [Oxley Conservation Day, Henley-on-Thames](https://fourwalls-uk.com/oxley-conservation-day/): A great day hosted by conservation experts, Oxley Conservation, in a wonderful Grade I medieval timber framed building, Chantry House in Henley-on-Thames. This is an annual event to debate the hot topics in the world of building preservation. This year, one of the main topics related to ventilation and moisture. fourwalls were asked to present about the importance of ventilation in traditional buildings, particularly in the context of retrofit measures where the thermal envelope of the building is subject to being upgraded. A very interesting day – see the Oxley Conservation website for further information about the event.
- [Ventilation Presentations for HVAC 2016 at the NEC](https://fourwalls-uk.com/ventilation-presentations-for-hvac-2016-at-the-nec/): fourwalls will be giving two presentations at the HVAC 2016: UK Construction Week Conference at the NEC on 18th October 2016. Ian Mawditt will be presenting alongside Emma Clancy, CEO of Certsure on Indoor Air Quality in Energy Efficient Homes. This will be followed by a joint presentation with Professor Rajat Gupta of Oxford Brookes University on the Characteristics and Performance of MVHR Systems. The Guardian recently wrote an article about a possible link to worsening asthma from the lack of ventilation in more energy efficient homes due to a lack of ventilation. The synopsis of the presentations are:The Guardian […]
- [Health Effects of Modern Airtight Construction (HEMAC)](https://fourwalls-uk.com/health-effects-of-modern-airtight-construction-hemac/): The HEMAC Network, hosted by the Mackintosh Environmental Architecture Research Unit (MEARU) at the Glasgow School of Art, and funded by the Arts and Humanities Research Council, held its first symposium on 21st September 2016. The network aims to bridge the gap between the fields of indoor air quality, health, sustainability and the built environment, providing a platform for discussion and collaboration while facilitating knowledge exchange to the built environment professionals. fourwalls director, Ian Mawditt – a committee member of HEMAC, gave a presentation at the first symposium. Entitled ‘The State of Ventilation in the UK‘, Ian presented findings from his […]
- [Ventilation Masterclass for the STBA](https://fourwalls-uk.com/ventilation-masterclass-for-the-stba/): The second in the STBA series of Masterclasses took place in September, with over 30 delegates learning from Ian Mawditt of fourwalls. Ventilation in retrofit projects is often one of the most overlooked considerations.  Yet ignoring ventilation is high risk, both in terms of occupant health and minimising moisture risk to the building fabric. Most retrofits, by their very nature, will automatically have a dramatic reduction effect on air leakage. However, it can be quite confusing to work out how best to ventilate – natural, mechanical – centralised or decentralised. A number of factors will dictate the most appropriate strategy, […]
- [Zero Carbon Hub Ventilation Study](https://fourwalls-uk.com/zero-carbon-hub-ventilation-study-2/): fourwalls were part of the project team for this study, led by the Zero Carbon Hub. The study team visited 33 dwellings across 6 construction sites in 2015 to see how effectively their mechanical ventilation systems were designed, installed, commissioned and handed over to occupants. In summary, we found things going wrong at multiple stages of the construction process at every site. The cumulative effect of these issues ultimately outweighed any good practice, as the systems we tested showed significant under-performance. At 5 of the 6 sites, fans were operating at only half the required duty or lower, i.e. flow […]
- [Characteristics and Performance of MVHR Systems](https://fourwalls-uk.com/mvhr-meta-study/): A long time in the making, but we are pleased to announce that the MVHR meta study has now been published. The meta-study was commissioned by Innovate UK as part of the Building Performance Evaluation (BPE) Programme to provide an overview of the performance and use of whole-house heat recovery ventilation (MVHR) systems in domestic projects. With increasing requirements for energy reduction, the impact of ventilation strategies has increased in importance, both in terms of energy reduction and indoor air quality (IAQ). The primary aims of this meta-study are to: Review the characteristics of installed systems in relation to air […]
- [Bristolian's Solid Wall Insulation Guide](https://fourwalls-uk.com/bristolians-solid-wall-insulation-guide/): We are pleased to announce that the Bristolian’s Guide to Solid Wall Insulation was launched last week. The guidance, which includes a video and an online tool as well a the guidance document, was commissioned by Bristol City Council and led by the Sustainable and Traditional Buildings Alliance (STBA). The new and user-friendly online tool and complimentary guide are available for those living in Bristol to help them make more informed decisions about how to insulate their homes in a responsible way.  By showing residents what to look out for, Bristol City Council believes that the uptake of one of […]
- [don't forget to check 'my fourwalls'](https://fourwalls-uk.com/new-website/): ‘My fourwalls’ is a blog set up by Ian Mawditt of fourwalls to chart the progress and performance of a deep retrofit that he undertook on his own home in Bristol. His house is being monitored and he intends to continue to post energy and environmental performance data periodically. ‘My fourwalls’ can be accessed from our main menu, or by clicking here. Please feel free to send Ian a message if you like him to post about anything in particular from his retrofit. Even a prompt to him to update the site – at least he knows people are reading […]
- [Indoor Air Quality Research](https://fourwalls-uk.com/indoor-air-quality-research/): We need your help… fourwalls are working together with AECOM  to undertake a study of indoor air quality in naturally ventilated homes in England constructed to Part L / F 2010 of the Building Regulations. The study, which has been commissioned by the Government, will help inform future ventilation standards, and accompanying technical guidance such that they are appropriate for the health and wellbeing of occupants living in increasingly airtight homes.  We are currently approaching developers and housing providers to request their assistance with identifying suitable homes. We will be carrying out the monitoring in recruited homes during the winter […]
- [Zero Carbon Hub - Ventilation Study](https://fourwalls-uk.com/zero-carbon-hub-ventilation-study/): fourwalls is pleased to be working with the Zero Carbon Hub on their In-Use Performance of Ventilation Systems in New Homes Study. The aims is to gather sufficient evidence in relation to design, installation and commissioning issues, which can lead to poor performance, both in air quality terms, and energy use. fourwalls is providing a technical lead role in the field work, which includes walkthrough evaluations, volume air flow measurements and tracer gas air exchange measurements. For more information about this study, see the Zero Carbon Hub page here or download the study summary here.
- [Building Performance Evaluation in the South West](https://fourwalls-uk.com/building-performance-evaluation-in-the-south-west-seminar-and-site-visit/): Ian Mawditt from fourwalls presented ‘how to evaluate buildings – the lessons we have learnt from the Building Performance Evaluation programme’ at this event on behalf of Innovate UK. Watch the video here. Through the BPE programme it has become evident that new buildings are rarely evaluated and fine-tuned, and that there is a lack of feedback between the building owner, and the design and construction teams. This can often result in impressive-looking buildings with dissatisfied occupants, and higher-than-expected energy bills. The programme has encouraged capacity building of BPE processes within the industry, and has helped the teams to develop […]
- [MVHR meta-study talk at Ecobuild](https://fourwalls-uk.com/mvhr-meta-study-talk-ecobuild/): Ian Mawditt from fourwalls has been working in partnership with Professor Tim Sharpe from the Mackintosh Environmental Architecture Research Unit and Professor Rajat Gupta from Oxford Brookes University on a meta-study of domestic heat recovery ventilation systems. The study, funded by Innovate UK, uses project data from the recent Building Performance Evaluation Programme to assess the air flow characteristics, energy and comfort performance, and user engagement of over 40 installed systems. The study is ongoing, but some of the key findings will be presented at Ecobuild on the 3rd March 2015 in the Building Performance Seminar session. Come along – […]
- [fourwalls partner with STBA in Bristol](https://fourwalls-uk.com/fourwalls-partner-stba-bristol/): fourwalls are pleased to be working in partnership with the Sustainable and Traditional Buildings Alliance (STBA) in Bristol. The STBA were awarded the contract by Bristol City Council (BCC) to develop the ‘design and technical guidance’ to support a city-wide retrofitting initiative. The BCC ‘Warm Up Bristol’ scheme, commences in earnest this year – the same year that Bristol holds the European Green Capital status. It will be the biggest energy-efficiency scheme in the country, with a total estimated value of £60M. The qualifying retrofit houses will be solid wall, privately-owned properties, which can be difficult to treat. The funding […]
- [welcome to our new website](https://fourwalls-uk.com/new-website-launch/): We are pleased to launch our new website. The site has been updated to reflect the broad array of services that we offer. We continue to offer compliance testing and inspection services, such as Energy Performance Certificates, ventilation commissioning and thermography. But getting buildings to perform as intended requires a more holistic approach, which includes how occupants engage with their buildings, whether it is at home or at work. We hope that this new site will give you  good overview for what we can do, but please do get in touch – we would like to hear from you.

## Pages

- [Research and Development](https://fourwalls-uk.com/research/): Buildings need to adapt to our changing environment – through using fewer resources during construction and in-use, but also to ensure occupant safety, and wellbeing. New technologies are constantly emerging. Techniques continue to develop. How successful will these be in practice? This is where we can step in. We work with a wide range of organisations in the private sector to help develop technologies, products, and strategies. We also work extensively with the public sector, using our technical experience to help governments develop policies for delivering net-zero buildings, and local authorities develop strategies for implementing these policies. Our research is […]
- [Cookies](https://fourwalls-uk.com/cookies/): We use cookies. Cookies are just small files of data that websites can write to your computer (via your browser) for any number of legitimate purposes, and the law now gives you the choice and the responsibility to decide which site may and may not use which cookies.Each time you visit the website, the server may deliver certain customised information to your computer based on the data stored in your cookie. This allows us to tailor the service to your preferences. You are not obliged to accept a cookie, and you may modify your browser so that it will not […]
- [Benchmarking](https://fourwalls-uk.com/services/performance-measurements/): [column_row][two_third bg=] Building users and owners are becoming increasingly aware of, what is commonly called, the ‘performance gap’. The energy performance of a new, low-energy building can be worse than a much older building. Benchmarking a building at design stage allows for a realistic evaluation of the predicted energy performance, and will help you to make informed decisions during the design and construction process. Benchmarks can form the basis for setting targets for building operators and energy managers when comparing expected performance against similar buildings. At fourwalls, we use recognised industry methods for reporting benchmarking data, such as CIBSE TM54 […]
- [Post-Construction Inspection](https://fourwalls-uk.com/services/site-inspections/): Post-construction quality inspection and testing will help to assess the quality of construction in relation to thermal performance, and to determine if the services are optimally commissioned. We offer a range of inspection and testing services. These include airtightness testing, ventilation performance measurements and thermographic surveys. Thermographic Surveys Infrared thermography is an established method for surveying buildings and can provide visual evidence of a range of defects in the building envelope. fourwalls have 15 years of thermography experience specifically relating to building energy and condition surveys. We use our own high-resolution thermal imaging equipment to conduct internal and external surveys […]
- [Retrofit Advice](https://fourwalls-uk.com/services/retrofit-advice/): The majority of existing buildings are very inefficient to heat, meaning they are more expensive to run. Retrofitting existing buildings to improve their thermal performance is becoming ever more important as we start to respond to, and adapt, our building stock for low carbon heating strategies. Retrofitting needn’t be complex, but there will be challenges. We take a strategic, long-term approach to retrofit projects, and encourage clients to evaluate the post-retrofit performance for a period afterwards to ensure both the design targets and their expectations are met – not just on paper. Our approach to retrofit projects is to help […]
- [Monitoring](https://fourwalls-uk.com/services/monitoring/): ‘If you can’t measure it, you can’t manage it’. Monitoring a building can help you to make strategic decisions about the efficient operation of a building, or to identify where investment may be needed to upgrade a building. We can install our own wireless telemetry sensors and data logging equipment, to monitor both comfort and energy buildings for short-term (e.g a few weeks) or long-term periods (a year or more), or if available we can use on-site data (e.g. from a BMS) to provide equivalent data. Please get in touch if you would like to discuss your monitoring requirements. Professor […]
- [Energy Audits](https://fourwalls-uk.com/services/energy-audits/): Most buildings offer considerable opportunities for reducing energy use and costs. A building energy audit is an inspection process that aims to quantify energy use and identify areas that use or lose energy. Our audits will help you identify the most appropriate solution for your building: from a domestic one-off house to preparing a business case development for a large corporation. We can also provide technical evaluations, and energy assessment reports compiled using the CIBSE TM22 (non-domestic) and DomEARM (domestic) methods. What’s involved? As part of the audit we will conduct a survey of the premises and collect various data […]
- [Design Advice](https://fourwalls-uk.com/services/design-advice/): The building performance gap sometimes exists because the expectations might be unrealistic. However, it is normally associated with the design of the building fabric and services – they may be incompatible, or a particular design detail might be very difficult to build. fourwalls offer design advice on all aspects of energy-efficient, sustainable building to help you manage the performance gap at an early stage. We work directly with self-builders and major builders, architects, engineers, and building owners. We can provide strategic advice through detailed design to ensure the best and most robust solutions are applied to your building. get in […]
- [Building Performance Evaluation](https://fourwalls-uk.com/services/building-performance-evaluation/): Building Performance Evaluation (BPE) Buildings don’t always perform as intended. Once in use, they may consume more energy than predicted, struggle to maintain comfort, or experience indoor air quality problems. BPE closes this gap by testing and monitoring how buildings actually behave: during construction, at handover, and throughout operation. Applying BPE early helps identify and manage risks before they become embedded. In occupied buildings, ongoing evaluation supports strategies to reduce energy use, improve comfort, and verify that systems are delivering as designed. Our approach combines a range of techniques, tailored to client needs and budgets, including: If you’d like to […]
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- [Services](https://fourwalls-uk.com/services/): Building Performance Evaluation Building Performance Evaluation (BPE) is a defined method, which includes the assessment and monitoring of building performance. The BPE process is best started during the construction phase, but the main benefit of the evaluation comes after the building has been in use for a period. [button color=sr-button1 size=”mini-button” url=”https://fourwalls-uk.com/services/building-performance-evaluation/” target=”_self” ]Read More[/button] Monitoring ‘If you can’t measure it, you can’t manage it’. In order to understand the energy flows in a building, and to contextualise this with user comfort and behaviour, it may be necessary to undertake a degree of monitoring. [button color=sr-button1 size=”mini-button” url=”https://fourwalls-uk.com/services/monitoring/” target=”_self” ]Read […]
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- [About](https://fourwalls-uk.com/about/): Fourwalls is an independent building performance company. Ian set up the company in 2005 having spent the previous 17 years working as a multi-disciplined building services engineer. Initially set up to respond to concerns about the drive for more energy-efficient buildings and the potential impact on the indoor environment, we have evolved to use our knowledge to help the governments of England and Wales develop their Building Regulations for Part F – ventilation, and Part L – energy efficiency standards. We are based in Bristol and operate across the southwest and south Wales*. We work on individual self-build/retrofit projects all […]
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