Extension builders in Swindon

Are you looking for professional extension builders in Swindon? Look no further than Great Western Building Services Ltd. Get in touch with us today for a free estimate.

Read what our customers have to say

The work from start to finish was done to the highest standard! Punctual, and professional.
JP and his amazing team have created a wonderful extra “living space” for us.
Thanks a bunch JP.
Mrs Carol Woods - March 2020

Garage Conversion.

We were really happy with GWBS and Simon’s work. They were extremely efficient and quick in finishing the job to a very high standard. The space was left meticulously tidy and they carried everything out exactly to schedule.
The plastering finish was perfect and electrics were just as we wanted them to be.
Ms Polly Nuttgens - March 2020

Insulation, plasterboarding, plastering and electrics to small dining room.

On time, very polite, helpful, and tidy.
Cleaned all the rubbish away.
I would definitely recommend them.
Satisfied customer.
Mrs Lee - Sept 2019

Leak on pipe behind wall in hallway.

John Paul and his team did a fantastic job. The extension was built to an excellent standard then JP project managed the fitting of the new kitchen which was made difficult by the numerous delays in deliveries, which he coped with magnificently, being flexible and making sure we were able to use at least part of the kitchen during the process.
Highly recommended.
Mr John Westwood - July 2019

Extension and fitted kitchen

GWS was not the cheapest but we were glad that we picked Jon Paul and his team, they were reliable, clean, tidy and easily overcame some unexpected problems and we were very pleased with the result, and would have no problems recommending them in the future.

Mr Colin Rees - May 2019

Single storey extension and moving existing kitchen into newly created space.

Excellent job, speedily carried out as per agreement.
mark_iv4, 30th Jun, 2016

Build retaining wall in garden

John Paul provided helpful advice on the solution and cost estimates, which we accepted. So the final solution was for 6 pillars.
His brickies turned up on the agreed date and time, did a good job, were very polite, tidy and considerate, working late to finish the job and cleaning up afterwards.
Mr J Burroughs - 25th Jun, 2016

Building three pillars on top of an existing wall

John Paul and his team were brilliant. Truly professional service and a great job. Was really pleased, having searched for ages for a good builder, the wait was worth it as the final job was great. Would recommend these guys 100%.
Marthadolly - 13th May, 2016

Brick wall

So far, so good. Really impressed with the amount of work achieved on the first day, and I will look to provide further feedback once job is completed. GWBS have been professional and courteous from the start, as we negotiated the job, organised the details, to being on site. Always prompt to reply and extremely reliable. I would thoroughly recommend.
L J Taylor - 12th Apr, 2016

Build a brick garage

Started on time, here every day, finished on time, kept to budget, did an amazing job!!! Best builders I have come across in 20 years. Well done and thank you Great Western Builders Swindon. Jason and JP the two owners are a delight to deal with, nothing was too much trouble. I would not hesitate to recommend them and I never thought I would hear myself say that about a builder! I would use them again in a heartbeat. Fairly priced too. Very happy from start to finish.
The_Little_House - 12th Apr, 2016

Summer room

Jean-Paul gave us a very competitive quote for rebuilding the wall at the end of my neighbour’s garden and mine. The work ran to time, where weather permitted, and we are very satisfied with the result. The whole team were friendly, considerate and helpful.
Rod H - 7th Apr, 2016

Rebuild 2 metre high boundary wall

I needed a downstairs toilet put in and GWB were brilliant. They not only put in a toilet but they made a small area of my garage in to a modern and light cloakroom. They were on time, tidy and communicated with me every step of the way. I can’t recommend them enough
Mrs Blake, Swindon

Downstairs cloakroom

I would definitely recommend them.
Miss Natalie Fox, Swindon


We needed some large porcelain tiles fitted to our kitchen and hall way floors. GWB sorted this out for us, advising us on what we should put under them to give them the best durability. The result is brilliant, in a house so old it doesn’t have a single straight wall, they have managed to lay it so at every angle it looks perfect. I was so impressed we also asked them to fit internal doors through the house and fit some skirting. Again the finished result is great, they were tidy, on time and kept us up to date with how it was all going. I would highly recommend them and will definitely call.
Mr Shane Blake, Swindon

Kitchen flooring and internal doors fitted.

A superb, local building company that I’d highly recommend!
Richard Smith, Cirencester

Single story extension.

Good professional organisation, very impressed with the speed of response to all my questions and happy with the way the job has gone and the standard of workmanship throughout.

Bungalow extension

Great experience with these guys from start to finish. The bathroom looks stunning, just as I had envisioined 🙂 it was obvious from the start the main objective from Steve and JP was that I was happy at each stage of the way. Steve is a perfectionist, which is great as I like symmetry. You will receive a fast , efficient, professional service I cannot rate them highly enough. Thanks Guys

Bathroom Fitting

Brilliant!! Great company and people to work with, my Wife and I are very pleased with the large extension that Great Western Building Services developed at our home – the quality of the build is very good, we would have no hesitation in recommending this company to anyone.


GWBS Ltd provided us with a competitive quote for a single storey extension to the back and side of our house for a new kitchen, utility room and garage.
Jason Walker project managed the build and trades, from start to finish including fitting the kitchen and flooring. He and his team were very easy to work with; helpful, friendly, trustworthy and very hard working.
All of the team were very communicative, quick to find a positive solution for anything that came up as the work progressed, and willing to go the extra mile to ensure the best possible outcome.
We are very pleased with our new extension.


Overall they did a very good job and the end result was better than expected. They were a bit untidy, so something to keep an eye on. However they were very responsive to any queries I had.


John-Paul, Jason and their team worked very hard on the extension to my bungalow. The bathroom and kitchen have turned out lovely.
As with all building projects we
had one or two problems along the way but were resolved by the team to my satisfaction.
They were helpful when I wanted to have some extra work done outside.


After looking for suitable builders for a large extension (2 storey side extension and a single rear) we were impressed with the professional service from John Paul & Jason.
The build was completed at a good speed, the team were open to last minute changes and/or additions with minimal issues and pricing was very competitive.
We love the finish and quality of work carried out and we would recommend GWBS for all building works…

If you need to see any pics of their work then please get in touch, thanks Mr & Mrs Collins, Hilmarton.



Very professional company, Excellent work carried out on the garden wall, nothing too much trouble. Craig and John Paul were both a pleasure to deal with.


From the initial engagement it has been extremely easy to work with the team from Great Western Building Services Ltd. They were competitively priced, prompt to respond and are proactive in bringing a wealth of their experience to our project.

The team are hard working, diligent and professional with a collaborative approach at every stage and this has ensured we have remained on target with timeline, budget and aspirations for the build.

Also very pleased with their continuous drive to deliver a quality build whilst also being considerate of the “fluffy stuff” such as being very personable and keeping the working site orderly.

Happy to recommend.



GWBS Ltd presented a competitive quote and I choose them above two other builders because they exactly followed the architects drawings in their pricing. The work had to be precise as a pre-manufactured greenhouse was constructed on top of the walls. I was very pleased with standard of work, the ‘can do’ attitude of the work force and their general demeanour.


Get in touch with professional extension builders in Swindon. Contact Great Western Building Services Ltd on
07860 247 430 or 01793 764 139

send us a messgae