Heritage Window Consultancy LTD Reviews 

6
TrustScore 4 out of 5

4.2

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Company details

  1. Heritage Building
  2. Architecture Firm
  3. Building Consultant
  4. Glass Repair Service
  5. Heritage Preservation
  6. Window Treatment Store

Written by the company

Heritage Window Consultancy Ltd provides independent specialist advice to owners, architects, planning consultants and designers working with listed and historic buildings, primarily in London and across the UK. Led by Principal Surveyor Gary Rowan and supported by experienced planning consultants, we prepare Window Condition and Heritage Assessment Reports, manage Listed Building Consent and planning applications, and liaise with local authorities to support successful outcomes. We advise on window and door repair, conservation, replacement and thermal upgrades, including secondary glazing, heritage slimline double glazing and vacuum insulated glass. We also source and coordinate specialist contractors for restoration, repair, retrofit and appropriate full or partial replacement. This integrated service helps clients navigate consent requirements, reduce delays and deliver compliant, proportionate works that respect historic character. Our evidence based recommendations improve energy efficiency, reduce heat loss and draughts, and create more comfortable interiors while protecting historic fabric and architectural character.


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4.2

Great

TrustScore 4 out of 5

6 reviews

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4.2

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6 reviews in the last 12 months

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Rated 5 out of 5 stars

I thoroughly enjoyed working with…


I thoroughly enjoyed working with Heritage Window Consultancy on heritage projects. Their service was consistently exceptional, both in the support they provided to me and in the professional manner in which they engaged directly with my clients.

Their passion for and extensive knowledge of heritage properties, particularly historic windows and traditional detailing were evident throughout their work. The combined technical expertise of the Heritage Window Consultancy team delivered excellent results on projects across central London.

I would have no hesitation in recommending Heritage Window Consultancy to anyone seeking knowledgeable, professional and reliable advice on heritage windows and planning.

September 1, 2026
Unprompted review
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Reply from Heritage Window Consultancy LTD

Dear Jennifer, thank you so much for your kind review, it was an absolute pleasure working with you and I hope we can work together again in the future!

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Rated 5 out of 5 stars

Exceptional Service and Expertise from Start to Finish

We were extremely impressed with the service provided by Gary at Heritage Window Consultancy and would have no hesitation in recommending him.

Gary went above and beyond what was contracted and was a massive help to Richmond Hill Hotel throughout the project. He was exceptionally thorough and diligent in compiling a fully referenced schedule of each and every window, clearly identifying and marking them on elevation drawings. The level of detail and accuracy he provided gave us a clear and invaluable record of the existing windows.

His support went far beyond the original scope of work. Gary provided excellent advice and guidance throughout our Listed Building Consent and planning application process for replacing the existing single glazing with vacuum glazing in a Grade II listed building within a conservation area. His knowledge, experience and willingness to assist made what could have been a very complicated process considerably easier.

Gary also liaised with a number of specialist glazing companies on our behalf to obtain quotations for the replacement glazing. The companies he recommended were all professional, helpful and competitively priced, which was another huge benefit to us.

Gary was professional, knowledgeable, responsive and incredibly helpful throughout. His attention to detail and genuine willingness to go the extra mile made a significant difference to the project, and we are extremely grateful for all his help and advice.

We would highly recommend Gary and Heritage Window Consultancy to anyone requiring specialist advice, assessment or consultancy relating to windows, particularly where listed buildings and planning considerations are involved. An excellent service from start to finish.

March 30, 2026
Unprompted review
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Reply from Heritage Window Consultancy LTD

Many thanks for your kind feedback Josh, it was an absolute pleasure working with you and the team at Richmond Hill Hotel, I am delighted that consent was secured and you can now start the window upgrade programme.

Rated 5 out of 5 stars

Very knowledgable

Gary provided an excellent service in assessing the heritage, character and condition of the windows in a complex multi-period property in a conservation area and providing recommendations for sensitive upgrades. He was extremely knowledgable and helpful and we have used him in multiple projects (listed buildings) in our architectural practice.

September 7, 2026
Unprompted review
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Reply from Heritage Window Consultancy LTD

Many thanks for your kind review, it is a pleasure working with you and your architectural practice team on so many varied projects!

Rated 5 out of 5 stars

Valuable Support for Heritage and Conservation Projects

We've worked with Gary at Heritage Windows Consultancy on numerous projects and have found his support invaluable throughout the Listed Building Consent process.

Gary provides clear, well-prepared heritage reports and practical guidance that help our clients navigate planning and conservation requirements with confidence. His knowledge of historic buildings and understanding of local authority expectations help ensure applications are presented thoroughly and professionally.

Our clients consistently appreciate Gary's expertise, responsiveness and straightforward approach, and we would happily recommend Heritage Windows Consultancy to anyone requiring heritage or Listed Building Consent support.

July 22, 2026
Unprompted review
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Reply from Heritage Window Consultancy LTD

Thank you, Jakub, for such a thoughtful review. It is always a pleasure working with you and the team on heritage and conservation projects. I greatly value our professional relationship and the collaborative approach we take to supporting clients through the Listed Building Consent process. I look forward to working together on many more projects!

Rated 5 out of 5 stars

Gary has been exceptional throughout…

Gary has been exceptional throughout the entire process of choosing our new windows. He is extremely personable and genuinely cares about both the quality of his work and the customer experience.

Gary spent a great deal of time helping me understand the different window options and carried out a comprehensive window survey, which gave me the information and confidence I needed to make the right decision. He also went above and beyond by helping me negotiate with the window contractor to secure the best possible price.

Gary is always willing to help and makes himself readily available at the end of the phone whenever advice or assistance is needed. Having someone with Gary’s expertise, calm manner and professionalism on your team made the whole experience considerably easier and more enjoyable.

I would highly recommend Gary to anyone looking for knowledgeable, professional and genuinely customer-focused support. He is a real asset to the team.

September 2, 2026
Unprompted review
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Reply from Heritage Window Consultancy LTD

Dear Amy, thank you so much for your kind words and recommendation. It was a pleasure to support you throughout the process, and I am delighted that the survey and advice gave you the confidence to make the right decision for your new windows.

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Rated 5 out of 5 stars

Simply The Best

Working with Gary on the pre-application and application to the Council to replace the old window sashes in our grade-II listed central London building with vacuum glass ones has been a positive experience from beginning to end. Gary has gone above and beyond at each stage of the process, taking the time to explain the many variables and challenges involved in the process, working in a self-reliant manner and diligently in assembling the materials and information needed, while carefully managing my expectations and always responding to my queries with great care and attention to detail. His dealing directly with the Council and taking the process almost entirely off our hands has helped us retain our sanity throughout what I can tell would have been a very stressful experience without him. His experience and expertise in the field of heritage windows are unparalleled, and his outstanding communications skills make him the perfect interlocutor when dealing with any council. He proved this time and time again while we were working together, leading us to a positive response to our application. I would definitely and wholeheartedly recommend him and his services to anyone interested in having their heritage windows assessed and/or replaced.

September 1, 2026
Unprompted review
Heritage Window Consultancy LTD logo

Reply from Heritage Window Consultancy LTD

Dear FH, Thank you so much for taking the time to leave such a detailed and generous review. It was a pleasure working with you throughout the pre application and Listed Building Consent process.

Replacing sash windows with vacuum glazing in a Grade II listed building can be complex, so I am delighted that we were able to guide you through each stage, manage the discussions with the Council and achieve a positive outcome.

I am sure that you will enjoy the thermal and acoustic benefits once your new sash are installed.

Thank you again for placing your trust in Heritage Window Consultancy and for your wholehearted recommendation. It is genuinely appreciated!

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