Organisations interested in supporting our work 

can get involved as an STBA 

Member (not-for-profits) or Affiliate Member (for profit)

Find out the benefits of membership - click here.


Patron Members:

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Cadw is the Welsh Government’s historic environment service, working for an accessible and well-protected historic environment for Wales. It plays an important role in improving legislation, policy and guidance for the conservation & protection of the historic environment. Cadw offers decision makers, owners & occupiers advice & guidance about managing change as well as promoting good conservation practice.

It is committed to supporting the development of skills of all heritage professionals including archaeologists, architectural historians, conservation architects and conservation craftspeople. In particular, it is working with others to attract and train new entrants into heritage construction.

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Historic England

Historic England is the public body that looks after England's historic environment. They champion historic places, helping people to understand, value and care for them.

Historic England publishes an extensive range of expert advice and guidance on the maintenance and thermal upgrade of historic buildings.

David Pickles sits on the STBA Board

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National Trust

The National Trust is a UK conservation charity, protecting historic places and green spaces, and opening them up for ever, for everyone. 

The Trust’s properties include over 25,000 buildings and structures of which more than 5,000 are houses and cottages.  The majority of these are let to private individuals as their main residence. As Landlords, the National Trust is responsible for ensuring not only the maintenance and repair of heritage buildings but also the thermal upgrade of properties in line with Private Rented Sector legislation.

Jo Lugg sits on the STBA Board


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Society for the Protection of Ancient Buildings (SPAB)

The Society for the Protection of Ancient Buildings is the largest, oldest and most technically expert national pressure group fighting to save old buildings from decay, demolition and damage. They are involved in all aspects of the survival of buildings which are old and interesting. Their principal concern is the nature of the "restoration" or "repair", because misguided work can be extremely destructive.

SPAB offers training and and advice, to both professionals and the general public. They produce publications and guidance and run educational events. 

SPAB was one of the first members to get involved with STBA work, putting pressure on government to change policy and also collaborating with us on events.


Standard and Affiliate Members:

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The 15:40 Architecture Collective is a group of architects who share a commitment to radically reduce the energy consumption of buildings through a fabric-first whole-house approach. The people involved include two architects on our panel of experts, Bob Prewett & Harry Paticas

The collective consists of Fran Bradshaw & Anne Thorne (Anne Thorne Architects), Harry Paticas & Tom Raymont (Arboreal Architecture), Jae Cotterell (Passivhaus Homes Ltd), Andrew Goodman (Good Architecture), Bob Prewett & Anna Carton (Prewett Bizley Architects), Junko Suetake (Suetake Studio 2).

The 15:40 architects have award winning projects both for new-build and refurbishment of historic buildings.  Each new project is assessed and 15:40 assemble their team best qualified for the work. 

website:      twitter: @15_40arch   

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A Proctor Group


Innovation runs through the Proctor family since its earliest records, dating back to the 1600’s. The family originally manufactured textiles and supplied flax to Scotland’s mills. This progressed to agricultural products, then finally to the supply and fabrication of acoustic and thermal insulation products, specialist membranes and ground gas protection solutions.  Brand names include Roofshield, an air & vapour permeable pitched roof underlay, Spacetherm, an ultra-thin insulation for thermal upgrades and Wraptite, an airtight & vapour permeable membrane for air leakage problems.

For any building to be an energy efficient, healthy, moisture free building envelope there is a clear need to manage the balance of Heat, Air, Moisture movement (HAMM) throughout the process of the building’s life cycle from design, construction, completion and use.

Understanding the importance of these key elements upon the building envelope is crucial to the successful construction and operation of a building. Architects and designers, and building products manufacturers must seek to ensure that they fully understand the science behind our buildings, managing the external and internal forces, which impact on the quality of the completed building, its performance in use, as well as the health of its occupants and the wider environment.

The building envelope is defined as the physical separator between the interior and exterior of a building. Typically, the key components of the building envelope will consist of walls, floors, roofs, fenestrations and doors.


website:  Twitter: @proctorgroup 


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ArchiMetrics, Building Performance Research



ArchiMetrics has grown out of the desire to answer some of the important questions surrounding Building Performance in the UK. Dynamic simulation tools give invaluable information on the digital building, ArchiMetrics aims to close the gap between the hypothetical and the actual by measuring and monitoring the performance of the physical building in question. 


On existing buildings this data is often gathered to provide more accurate information on which dynamic simulations are then based and to help inform the specification process. On new buildings the data collected can help verify predicted outcomes, confirm build quality and in the longer term help identify any emerging problems before damage occurs.  The primary aim remains to improve understanding, performance and quality of our built environment.


Building monitoring is sometimes guided by available equipment rather than the question being asked. As such we have designed and developed equipment, protocols and analysis techniques which are tailored to answering the specific questions in hand. As these questions expand and new ones are formed we are able to respond with dedicated solutions to help resolve, as best we can, the questions asked.


Currently, the primary areas of focus are in situ U-value measurements and hygrothermal monitoring across construction fabric. 



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Between Time Ltd.

Between Time are conservation builders specialising in the traditional repair of listed buildings and have been working on projects both large and small since 1984. The Directors, Rowan and John Lloyd combine a passion for old buildings with close attention to detail, extensive technical knowledge and ongoing training and development. The company offers conservation expertise and total project management, specialising in the traditional repair of listed buildings, period properties, churches, museums and other heritage sites throughout Hertfordshire, West Essex and North London. With a dedication to conserving the architectural details of the built heritage members of the Between Time team have successfully completed projects in both the public and private sector.  As well as individual home owners, their clients include The National Trust, Historic England, Local Authorities and church councils.


Since the 1980′s John Lloyd has worked with many conservation bodies, including the National Trust, Historic England and the Architects Association leading to the development of “best practice” and forwarding the cause of Conservation particularly in the use and application of lime renders and mortars.


Between Times Website: 

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British Woodworking Federation

The British Woodworking Federation is the trade association for the woodworking and joinery manufacturing industry in the UK.  The organisation based in the Building Centre in London, represents 700 members drawn from manufacturers, distributors and installers of timber doors, windows, conservatories, staircases, furniture, and all forms of architectural joinery including shopfitting and heritage works, as well as suppliers to the industry.  BWF also manages The Wood Window Alliance, the BWF Certifire Fire Door Scheme and the BWF Stair Scheme, activities focused on promoting the use of timber products and raising standards through accreditation and certification.  

website:   Twitter: @BritWoodFed 

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Ecological Building Systems

The ethos at Ecological Building Systems is to achieve 'Better Building' by adopting a 'Fabric First' approach to design, with the use of more natural materials to optimise building performance and durability.  The focus of their building product range is to deliver products that achieve 'diffusion open' buildings.  Forming strong relationships and networks with their European partners, the first products that Ecological imported was the ‘pro clima’ range of airtight and windtight building products.  The company then went on to establish itself as sole importers of some of the highest performing, quality natural insulations available on the market, their range includes GUTEX wood fibreboards; CALSITHERM Climate Board; THERMO-HEMP and THERMO-JUTE insulation; ELKA Strong Boards; and Wellhofer Attic Hatches. Ecological Building Systems also provide full technical support and training.

Ecological Building Systems was set up in Athboy, County Meath in 2000, the UK division was established in 2007 and is based near Carlisle in Cumbria.  Ecological's parent company is MacCann & Byrne a company steeped in history having been established on the same premises in Athboy since 1906.  

website:   twitter:  @ecologicalbuild 

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ESC - Environment Study Centre

The Environment Study Centre (ESC), improves skills and knowledge through training and education and is the only organisation training individuals to obtain a recognised qualification in energy efficiency and retrofit of traditional and historic buildings. It is the most credible organisation in the delivery of retrofit training with a track record in research and qualification development. ESC has delivered retrofit training in partnership with a range of organisations including CITB, the FMB and the National Trust. Other courses offered include dealing with moisture and dampness in buildings as well as building conservation which is also delivered by ESC often in conjunction with other organisations. The 2-day energy efficiency and retrofit of traditional buildings course delivers an SQA Level 3 Award and in the past three years hundreds have achieved this qualification.

website:   twitter: @escukltd 

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Four Walls is a consultancy based in Bristol specialising in post-construction testing and evaluation; in-use studies of building performance (including fabric analysis, indoor air quality, and ventilation effectiveness); energy use and analysis; and occupant satisfaction studies. Its founder, Ian Mawditt, is an independent building researcher, specialising in the field of energy performance and occupant comfort.


Ian’s work and field experience help to provide an evidence base for informing building performance standards. He was part of the technical team supporting DCLG in the development of recent revisions to Part F and Part L of the Building Regulations (England and Wales). He is engaged by Innovate UK as an expert under the Building Performance Evaluation programme, and provided technical guidance for the Retrofit for the Future programme. He also works with academia and organisations such as the NHBC Foundation, supplying strategic and technical support.


Website:      Twitter: @Ian_Mawditt 

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Greengauge is a building & engineering consultancy specialising in sustainable, low energy design.

Physics and thermal dynamics drive their philosophy and they approach projects ‘Fabric First’ to deliver buildings that are comfortable, simple and efficient.  Greengauge work on new-build and existing buildings optimising insulation, fenestration and thermal bridging to produce robust buildings with minimal systems necessary to maintain comfort.

Grengauge are completely independent of manufacturers, products and installers so can provide objective advice, backed up by a suite of software tools and research.

website:   Twitter (Toby Cambray)  @Greengaugenergy  

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Heritage Revival

Heritage Revival was founded by Claire Truman RIBA in 2017 to specialise in the creative re-use and re-purpose of traditional buildings. Heritage Revival recognises that many traditional buildings need sensitive treatment to be appropriately redeveloped to safe-guard their cultural and carbon-store value for future generations.

Projects are designed with the wellbeing of occupants paramount and Heritage Revival explores potential opportunities for enhancement to develop the framework of the brief.

Claire is also a specialist in Heritage Interior Design which enables Heritage Revival to take a wholistic approach to enhance the harmony between a building, its setting, interior treatment and inhabitants.

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Instute of Historic Building Conservation (IHBC)

The IHBC is the principal professional body for building conservation practitioners and historic environment specialists working in England, Northern Ireland, Scotland and Wales, with connections to the Republic of Ireland.

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Lime Green Products Ltd

Founded in 2002, Lime Green Products is a leading supplier of high quality lime-based products for use in building renovation, conservation and development work.  Their customer base is wide and includes home owners, builders merchants, contractors and public bodies.

Lime Green is a forward thinking, innovative company committed to offering construction materials from sustainable sources which minimize environmental impact and contribute to healthier buildings. Some of these materials are presently bought in from other EU sources, but the vast majority are manufactured on-site in Much Wenlock.

In order to improve its competitiveness and better support the recognised advantages of breathable building insulation systems and lime based materials, Lime Green has secured the BBA Accreditation for its Warmshell External Wall Insulation System suitable for both existing and new traditionally built houses and commercial buildings.

Warmshell “Exterior” has an expected life span of at least 30 years, and is the only external wall insulation system using breathable lime render to have passed ETAG 004 European Technical Approval and to hold a BBA certificate.  Lime Green will ensure compliance through it’s installer and specifiers training programme.

To meet growing demand for its environmentally friendly products, Lime Green has secured planning permission for the development of its current site to provide significantly greater manufacturing capacity and warehousing together with new offices.  The first phase of this expansion was completed in 2014.

Research and Development are key to the company’s success, products are quality controlled and refined wherever possible and new products designed all in their Lime Lab.

Website:  & Twitter: @lime_products

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Janus Associates Ltd 

Janus Associates Ltd is a specialist heritage consultancy and historic building surveying practice with offices in Thame, Oxfordshire and the Royal Borough of Kensington and Chelsea – serving London, Buckinghamshire, Oxfordshire, Berkshire, Cambridgeshire and Gloucestershire.

The company is headed by Rupert Hilton, a conservation-accredited professional with both the Royal Institution of Chartered Surveyors (RICS) and the Chartered Institute of Building (CIOB), meaning you can have absolute confidence that we have the requisite skills, qualifications, knowledge and experience to treat your building, structure, monument or object with the care and attention it deserves.

With a philosophy based on the fundamental conservation principles of minimum intervention, maximum retention of significant historic fabric, quality, compatibility and reversibility, we offer a variety of heritage services which can assist you at every stage of your acquisition or project.

website:     twitter:  @Janus_Ltd 

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Oxley Conservation Ltd.

Richard Oxley, founder of Oxley Conservation, was the first to take advantage of the STBA Affiliate Scheme. 


Oxley Conservation works exclusively with traditional buildings, for clients ranging from national institutions to individual property owners. Their principal aim is to ensure that all the buildings receive an appropriate and sympathetic approach that respects each building's individual nature and special qualities.

They adopt a holistic approach to conservation that encompasses not just the buildings but also natural resources and wildlife. They aim to find sustainable solutions to building conservation problems and offer a broad spectrum of services including traditional building surveys, project management, contract supervision, grant applications, consultancy and training. 


Richard is a published author and has regularly contributed articles to the specialist press on many aspects of building conservation.   

Website:   Twitter:  @OxleyConserv

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Natural Building Technologies

Across three decades NBT has been dedicated to offering simple, robust and effective systems for better building.   As the name suggests, Natural Building Technologies use only natural materials and provide effective building solutions that benefit people and nature. 

With experience built up over more than 2,000 successful projects, their success is due to their whole house approach. NBT developed solutions for the whole building envelope - new build and refurbishment - meaning there are no unintended consequences where project elements work against each other. 

NBT provides expert technical, design and construction support and have built a reputation for long-term monitoring and evaluation to ensure performance targets are being met.  NBT is a member of the Natural Fibre Insulation Group, an ASBP initiative to promote the extra benefits of natural fibre insulation - of particular significance in solid-wall buildings.

Website:   Twitter:  @NBTLtd

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Mineral Wool Insulation Manufacturers Association

Established in 1962 (originally as ‘Eurisol’), the Mineral Wool Insulation Manufacturers Association (MIMA) provides an authoritative source of independent information and advice on rock and glass mineral wool and promotes the benefits of mineral wool insulation.


MIMA’s commitment to improving the built environment is demonstrated through the sponsorship of independent research (for example into the ‘as-built’ performance of buildings) and the development by its members of practical, robust and cost-effective mineral wool insulation solutions.


The Association has a growing role in drawing together other trade bodies and institutions to work together in partnership on major industry projects.  It also works to ensure that members play a full and positive role within the sector, advocating sustainable business practices, developing industry standards and promoting the application of best practice. 


The Mineral Wool Insulation Manufacturers Association actively follows and contributes to the development of relevant directives, laws, regulations, standards, action plans, support programmes, incentive schemes, building and fire regulations and insurance requirements at EU, UK and regional levels. MIMA is a contributing member to independent studies undertaken by the European Insulation Manufacturers Association (Eurima), supporting actions and initiatives undertaken by the European Commission with significant involvement with British, European and international standardisation work as well as chairing and contributing to numerous energy-related standards and programmes.


Website:    twitter:  @MIMA_UK

MIMA Members:

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Property Care Association (PCA)

The mission of the Property Care Association is to promote high standards of professionalism and expertise within the industry through training and other support services. To promote these standards outside the Association to ensure that members are perceived as the best providers in structural maintenance, timber preservation, damp and condensation control, flood protection and remediation and the control and management of invasive weeds.

With a comprehensive training programme and a wealth of information for members, industry professionals and householders, the Property Care Association is the industry expert. Always striving to promote the work of the specialist contractor to clients, the PCA provides a voice on behalf of members. We work with government departments, respond to consultation documents and provide assistance with the development of new guidelines, all with the aim of improving outcomes and promoting best practice.

PCA promotes excellence through:

  • Ensuring that members adhere to strict membership criteria. The provision of a comprehensive range of training courses specifically designed to focus on the specialist areas of work that PCA members undertake. The courses lead on to qualifications.
  • An ongoing audit of contractor member companies, ensuring that all aspects of their businesses operate to the highest standards. This involves checking company systems & procedures, health & safety practices and staff development and training programmes.
  • A regular programme of site inspections to which all contractor member companies are subject. PCA appoints an independent inspector to visit sites and confirm that good practice is maintained in clients’ domestic and commercial premises.
  • Increasing standards to improve consumer confidence. As a founder member of TrustMark, PCA members are validated through this government backed scheme which declares that all contractors working in the domestic environment are trustworthy and competent.
  • Supporting opportunities for Continuing Professional Development to enable members to maintain and develop their knowledge and skills in waterproofing, damp control and timber treatment.

          Website:            Twitter: @PCAPropertyCare

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RetrofitWorks is a ‘not for private profit’ co-operative, matching communities & homeowners who want to retrofit their homes, with local, quality assured SME assessors and installers.

RetrofitWorks uniquely joins these groups together into two sets of key members – coming together, under a transparent organisation, to identify the need for and delivery of high quality retrofit projects:

RetrofitWorks Advocates – organisations that represent a constituency of potential customers, acting as trusted advisers on their behalf. Groups such as community groups, local authorities and other local stakeholders comprise our Advocate members.

RetrofitWorks Practioners – certified companies wishing to carry out retrofit advice, assessment, design, coordination, and installation. All Practitioners are fully trained, including PAS2030 accreditation for SME businesses.

This structure transforms the traditional approach to improving properties.

Our service features and benefits are summarised below:

  • Householders are assessed, and three quotes are generated from the energy survey from local SME companies via our software portal
  • All installer Practitioner members are quality vetted, and referenced
  • We advise on best grant scheme for householder circumstances
  • Our systems mean far fewer visits are necessary
  • RetrofitWorks’ controls ensure best service and a transparent delivery model

Our approach ensures value for money for the property owner by creating competition amongst members, and our structure reduces costs through economies of scale. RetrofitWorks offers a ‘one-stop-shop’ guaranteed retrofit installation, and quality of service is assured by RetrofitWorks’ staff and governance policies.

Roger Nelson

Having renovated his own 1830s home and coach house from 2012 using ‘fabric first’ energy-efficiency principles, Roger went on to work from 2014 as a project manager and designer with a local builder in South East London, including a low carbon retrofit project on a large Victorian home and many more conventional home improvement projects.  He is hopeful that the recent revival of media interest in environmental issues will eventually lead to an increased interest in improving the energy efficiency of our older housing stock.