Thomas Building Plans
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Thomas Building Plans specialise in creating professional building plans & architectural design drawings for home extensions, loft conversions and home alterations for our private clients. They are the type of drawings that are required for Planning Permission applications, Building Regulations Approval and that a builder can follow to produce your home extension, loft conversion or internal alteration.

Home extensions, loft conversions and alterations can add significant value to your home, as well as the benefits of a larger home. Thomas Building Plans will talk through your ideas and desires for your new home extension or conversion, provide guidance and bring our valuable experience to produce your building plan designs and architectural drawings.

We have many years' experience in the Bristol, South West and Wales area. We are a family business and focus on helping local people realise their dreams for a larger home or a sound investment. Find out how we can help you with home extensions, loft conversions, internal alterations, new builds, conversions, building plans, architectural design, planning permission applications or building regulation applications.
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At Thomas Building Plans, we feel the most important aspect of having a home extension, conversion or new build is choice. We have always found that talking through some of these ideas leads to the best design for you and your family, for resale value or for all the many other reasons that exist to make changes to your home.
You can see many examples of our building plans & architectural design services in the 'RECENT PROJECTS' section of this web site. If you are considering a rear single storey extension, there are several choices available to you. If the rear extension is approximately 3 metres deep, then a lean-to roof may be appropriate, regardless of the width of the extension.
We can show you various design options and only when you are completely content that you have made the best choices, do we then proceed with detailed drawings and plans. We use the latest computer-aided design systems, so you can 'see your new home in 3D' and make any changes or additions, or change your mind completely after realising the potential for your home.
We will achieve the results that you want within the stringent rules and regulations that exist. These rules are governed by your Local Authority. There will be no obligation to progress any further, the choice to proceed will, of course, be yours. Feel free to contact us today to see how you can improve your home and make the best investment that money can buy.
This is usually required if you intend to alter your home in any way such as an extension, loft conversion, changing the use of a building (from a house to a shop, for example) or dividing part of your house for use as a separate dwelling (two storey home into separate flats). Planning Permission is also required in many other situations so it is well worth contacting us to discuss your ideas and plans and for us to advise accordingly.
Reviews (9)
Nick Howells
Nick Howells
Dec 25, 2020
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We have been hugely impressed with Simon throughout our building project.
He has been supportive, helpful and professional throughout the process. His ideas and solutions from initial conception to coping with us changing our mind at various stages have worked out really well. Various builders that have quoted for different stages of the work have commented on the quality and clarity of his plans. We would highly recommend! Thanks again.
Jon Woodland
Jon Woodland
Nov 17, 2020
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Positive: Professionalism
We used Simon for our extension and he was brillent, lots of ideas and very friendy. We contacted him two years after the build was finish for some extra info and he was great. We were really impressed with his service, so much so we have recommended him to friends.
Sonia Byng
Sonia Byng
Jun 24, 2020
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We engaged Simon to plan our one storey extension. I can honestly say that we were really impressed with his service. He is very friendly and easy to communicate with. He really took the time to listen to what we wanted, answer our questions and drew up the plans accordingly. We've just received planning permission and everything has run really smoothly. I would have no hesitation at all in recommending Simon to anyone looking for an architect.
Wilky Wilkinson
Wilky Wilkinson
Jan 24, 2020
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We contacted Thomas Building Plans after being recommend their services from a work colleague, who had just completed an extension. From the first meeting Simon was enthusiastic and incredibly helpful in talking through our original ideas and transforming them into something practical. He was able to help us visualise what the finished design would look like and produced the plans quickly so we were able to get them submitted. He was always available either on the phone or via email if we had a question and was quick to respond.
Simon also gave us some helpful recommendations for local builders
Hugh Thorpe
Hugh Thorpe
Nov 29, 2019
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We have used Simon twice over the past 10 years for house extensions. On both occasions he has provided great suggestions on the design and provided plans that facilitated a smooth passage through planning and build. We would defiantly use Simon again if we have more building work done!
Mahbub Hasan
Mahbub Hasan
Oct 22, 2019
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I used Thomas Building Plans following a recommendation from a friend who used them for his loft. Simon provided an excellent service in drawing up plans for our 2 story side extension. His knowledge and ideas were very helpful in the process. Will happily recommend them to friends and family.
Leigh Musgrove
Leigh Musgrove
Sep 10, 2019
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Following a recommendation from a friend to use Simon in the planning of our new two floor extension I can confidently confirm we made the correct choice.
Very friendly, knowledgeable and approachable he guided us through the whole process explaining clearly all stages. As we were new to this we could easily of struggled.
We thought we had a clear design in our heads however with Simon’s recommendations we were able to further increase our floor space through a small design change that’s really made a big difference.
Simon even recommended the builders we used who were simply brilliant.
Philip Pratt
Philip Pratt
Sep 10, 2016
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I have engaged Thomas Building Plans Ltd 6 weeks ago to draw up the plans for my house extension. Simon Thomas seemed very keen, we spoke at length on the phone about my works, he came round and had a look, promised great things and we had an action plan as to what was required. Simon said he would forward me a price in 2-3 days and all was seemingly good, until a week went by with nothing. I tried contacting to find out what has happened, but received no response to any messages left.
Having done a bit of digging it would seem like Thomas Building Plans are a Structural Engineering company who
Mike Parsons
Mike Parsons
Sep 02, 2013
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We approached Simon to support us during the development of drawings for a house extension and made it clear we were ensure on how to proceed.
Simon provided a very lean and professional service. He particularly impressed us with his excellent knowledge of housing in the Bristol area and on government and council policy/building regulations.
He is approachable and consistent in his delivery of detail and documentation. The face-to-face debrief was very useful and recommended as it allows us to discuss drawings and he also had some good ideas on how we could improve our designs.
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