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Years Experience
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Conversions Completed
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Customer Focus
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The Loft Conversion Specialists

Allied Welsh have been converting lofts since 1989 and are committed to using the best materials and professional tradesmen to fulfil the needs of all customers

Our challenge is to remain the premier loft conversion company in Wales and the West, to provide a stress-free and efficient all-inclusive loft conversion service based upon high-quality customer service from start to finish. This we aim to achieve via a committed workforce with the skills and enthusiasm to carry out their work to a high standard

Why choose Allied Welsh?

Free Survey & Fixed Price Quotation

Our surveyor visits your home to design your loft conversion that meets your requirements and is viable

Professional Expert Advise

With over 30 years experience and 3200+ conversion completed

Design & Planning Team

Architectural drawings to design your loft conversion and obtain the required planning approvals

Dedicated & Qualified Workforce

All required trades to construct and complete your conversion are in house and employed by Allied Welsh

A Name & Reputation You Can Trust

We greatly appreciate our fantastic clients who are always complimentary during and following completion, and highly reccommend us to others

Loft Conversions

Loft conversions are a great way to dramatically increase your living space. Far more cost effective than moving house whilst also also increase the value of your home. You can trust Allied Welsh to make your loft space work for you.

Garage Conversions

Converting your garage to an additional living space is quick and economical. A space that is typically used to store unwated ‘bric a brac’, can be converted to a comfortable habitable room within a matter of 1 -2 weeks.

Architectural Drawings & 3D Visualisation

Our in-house design and planning team will produce professional and accurate architectural drawings as part of the service, and include 3D Views of both the internal and external appearance. To best help you visualise your dream conversion before any works commence.

Satisfied Customers

caroline fieldcaroline field
15:02 12 Jul 24
Could not recommend Allied Welsh more. Their professionalism was second to none and the results speak for themselves. They made everything so easy from start to finish, and the builders even bought our toddler a little birthday present, which was unexpected and super thoughtful. They were friendly, respectful, tidy and were blown away by their craftsmanship. Thank you so much!
Rachael DurkanRachael Durkan
21:31 05 Jul 24
We would highly recommend Allied Welsh for a loft conversion. The whole process from design to completion was hassle free. Any concerns we had were dealt with immediately and efficiently throughout the entire process. The team were polite and respectful, and cleared up at the end of each day with little disruption to our everyday lives. We are very pleased with the conversion and it has been completed to a high standard, thank you Allied Welsh!
08:32 05 Jul 24
Allied Welsh have just completed our loft extension, master bedroom with huge dormer window, bathroom and changing room with large Velux windows. It was a far from simple project not helped by us changing the layout. We looked at a number of companies but at the end of the day it was Allieds reputation dating back over 30 years and the fact they were finically stable (we checked their accounts on line before even contacting them). The staff from design though to all specialist tradesmen are employed unlike so many other companies so everything was kept under control. Finally every single member of the team were a pleasure to deal with. We have absolutely no hesitation in recommending them to anyone considering similar projects.
Zaid MosawyZaid Mosawy
12:59 24 May 24
Trustworthy and high quality. Allied Welsh delivered on time and budget. Considerate towards the neighbours and nice guys to work with. Would recommend for any loft conversion.
T GrifT Grif
18:06 27 Mar 24
We were delighted with the garage conversion undertaken by Allied Welsh. From the initial cost estimate, the drawing up of plans, to the alterations we made, we were kept up to date with progress reports on what would happen next. All the workforce were polite, friendly and professional and cleaned up at the end of each days work.We would thoroughly recommend Allied Welsh to any prospective customer pondering a garage or loft conversion.
Laura TaylorLaura Taylor
14:01 05 Mar 24
Fantastic company to deal with from start to finish. We had our small terraced attic converted to a bedroom. Work started in December and finished in January. No problems whatsoever, mess cleaned up every day. For such a big job there was minimal disruption to us. The whole team were hardworking and polite. Their standard of work and attention to detail was flawless. We love the new room, we're so glad we a) took the plunge and b) chose Allied Welsh!
Lucy PriestLucy Priest
08:59 08 Feb 24
The whole team made the process from start to finish so smooth and hassle free.We're really happy with the dormer extension and the work is finished to such a high standard and cleaned up at the end of each day. We have a toddler and everyone was really considerate and friendly which was really helpful and meant we didn't have to worry. Nothing was too much trouble and communication was great throughout.I would highly recommend Allied Welsh!
Kara DaviesKara Davies
13:52 18 Jan 24
Amazing firm, quality of the work and the team they had working on our house was outstanding. I would highly recommend them to anyone.
Luke ThompsonLuke Thompson
13:16 21 Dec 23
If you are looking to convert your loft, I recommend Allied Welsh. Easy, stress free and hassle free.Any queries were answered straight away and we were consulted before final design if we wanted to make any changes.Communication has been brilliant over the course of the project from initial enquiry to project completion,Really happy with our converted loft and can’t wait to use it after it has been painted.
MLO 56MLO 56
13:32 31 Oct 23
Amazing service, worked within the budget I had . couldn’t have asked for any more.Had an attic conversion, I already had plans and planning in place that I forwarded on to allied welsh.They suggested to change them slightly, I took a look at the changes and we were very happy , but mentioned that I wish I could’ve kept more space in my main bedroom where I had fitted 4 door wardrobes but was happy to gain a extra room that was going to be a small bedroom which would mean removing one door.They managed to keep my fitted wardrobe and altered them slightly inside to house the new staircase inside and created a new pole in the wardrobe.From start to finish everything was excellent, house was kept clean which I was worried with all the back motor and light carpets throughout , the work men were constantly vacuuming and dusted down the top to bottom through to the hallway and front door when they left and additionally while they worked. Every part of my carpets were covered.Any issues I had I sent a email and received either a call or email immediately and they were resolved.The room turned out better than expected, where I now have a double bed/ office space.They utilised as much of the space as they could and the attic storage space is very easy to access.Everyone was so polite and hard working. I did have issues with my neighbour as he didn’t want to sign the part wall agreement and did try and stop my planning application, I couldn’t get it signed and they spoke to them in person and had it signed.All the carpenters work was fantastic and they matched the doors, door handles and skirting perfectly. Plastering was perfect .They snagged on a regular basis through the work , at the end I checked everything and didn’t find any snags, not one !Lovey additional storage added under new staircaseAll in all 10/10Thank you Allied Welsh
Christian McCrackenChristian McCracken
17:41 11 Oct 23
We had a loft conversion done on a 3-bed terrace. From the beginning, we were well informed at every step and we received very detailed plans. We even had the opportunity to choose where to put plug sockets and ceiling lights. There was also the opportunity to consider different types of roof insulation to maximise the internal headroom.Work was carried out every day so the whole job was done in seven weeks (including one week of no work - we were told - when the roofers were on holiday).We really liked this approach as the whole job was done really quickly instead of over several months.The finish was very professional and all, even the small, loose ends were sorted out, including cleaning up after the scaffolding was removed.Quote-wise, above average. But the quote was adhered to with no unexpected extra costs and the total duration was very quick. The only extra cost was choosing a more expensive, slimmer, roof insulation.Highly recommended.
10:12 25 Jul 23
Great team. Great experience. Stress free as everyone highly skilled and competent. Very well organised and efficient - does exactly what they say they will do to the nearest mm!. Finish is precise. Will definately use again. Payment schedule unique and really good, as day 1 everything turns up - all materials and team. No issues of making payments every week. Enjoyed the whole process and pleasure to have the polite team in the house. Awesome- Thankyou everyone
elaine guildingelaine guilding
21:02 19 Jul 23
Fantastic loft conversion, guided by Allied Welsh every step of the way. AW built the design around our initial uncertain ideas, advising and supporting us through unfamiliar territory, always willing to listen to changes of plan and to adapt their schedule to fit new requests - often with very little notice. The work team were invariably friendly, polite and highly skilled. They were a pleasure to have around and we cant praise them highly enough.
Kathryn CorcoranKathryn Corcoran
09:39 22 Jun 23
We’re absolutely delighted with our loft conversion. Allied Welsh were superb. Great design, professional workmanship and everyone we met was courteous, positive and communicative. Having work done on your home is almost no one’s idea of fun, but AW made the process almost painless.We did have slightly cheaper quotes but are so pleased we chose Allied Welsh. We cannot fault them.
Sofia GameiroSofia Gameiro
13:57 14 Jun 23
Allied Welsh just completed our dormer loft conversion. Overall they did an excellent job without much disruption, considering the scale of works, and with an extremely professional team. The works completed match initial specification and were done to the expected standard. The team was professional, organised, clean, and pleasant to interact with. I am very pleased with their work process and outcome and would recommend to anyone looking to do a loft conversion.
James MochanJames Mochan
10:14 17 Mar 23
I chose Allied Welsh initially as they quoted less than others I had reached out to. Even with the lower price there was no compromise in quality. The craftsmanship was excellent and they did a really professional job. The build was finished inside the time estimated and they were a really friendly and considerate bunch. Couldn't recommend highly enough
david norvilledavid norville
14:48 03 Mar 23
We recently had our loft converted. We have received a professional service throughout. Everything is kept in house meaning the work from start to finish was completed in just over 4 weeks, no waiting around for subcontractors. This was the main reason for choosing Allied Welsh. We would recommend them to anyone 100%
Sarah DanielSarah Daniel
12:27 06 Feb 23
We had a straightforward loft conversion completed in less than 5 weeks, with tradesmen on site everyday. All tradesmen were friendly and reliable, punctual and cleaned up at the end of each day! Professional and efficient service. From planning to completion we were kept in the loop and updated with all arrangements. Could not recommend enough!
Samuel LabibSamuel Labib
09:28 30 Nov 22
We had a loft conversion with Allied Welsh which they’ve just completed. From start to finish the process was smooth and very easy. The quote was given was reasonable, the drawing up of the plans and getting planning permission was straightforward. We were contacted an offered an earlier start time due to a cancellation. The work took exactly the length of time we were advised. The builders, electricians, plumbers and plasterers were all very polite, punctual and left the house clean at the end of each day. The build quality is great. Not a bad word to say about this firm. Hire them for your work without a second thought.
Harley MastersHarley Masters
08:45 06 Nov 22
Quality company. I requested a quote for a loft extension in early 2022 as my friend used Allied Welsh and raved about them. I got a call from Dave (their surveyor) quickly and he was in to see my property within a week. He gave me a quote on the day and said - in his cheeky way:- "This quote's stupidly cheap so you'd better accept it before I get shouted at by the boss". He wasn't wrong, as other quote came in about 10-15% more. What I was amazed at is the quote didn't change, they honoured it, even though prices have shot up since then.The process was easy: I had a Harry Potter lookalike and his team come to my house on the first day and they explained what would happen and how it would all work. From start to finish they were all really friendly and great fun to have in the house. I heard reports that they even helped an elderly gentleman who fell over in the street outside, which was nice to hear.Any questions which I had during the process were answered swiftly (even on the weekend) and any issues which I raised (a paving slab got broken on my path about halfway through) were promised to be dealt with. Dean came over at the end and made sure the whole project was finished to perfection.It goes without saying that I would recommend them, I already have and will continue to do so.Thanks to Dave, other Dave, Dean, Hugh and the rest of the team (Paul and Lee at the start) that dealt with the process from start to finish. Excellent.
Gem and DanGem and Dan
19:36 25 Oct 22
Allied Welsh successfully completed a complex loft conversion for us during the Summer.The conversion was completed on time, and within the agreed fixed price, to an excellent standard - commented on by friends and neighbours.Communications: we found comms to be first class- professional, respectful and very prompt. All of our concerns were dealt with very promptly and helpfully, and Allied Welsh came across as straightforward and honest. All the design and build team are part of the Allied Welsh permanent staff rather than sub-contractors, so there was a single point of responsibility & accountability for any queries or issues. We also appreciated not having random sub-contractors wandering around our house.Design & Build: we went through a number of iterations from the initial design until we were happy with the proposal and the design team were patient and easy to work with. Build quality and attention to detail were superb- build team worked very hard, were friendly & respectful, and were extremely tidy.It all made for a comparatively stress free building project which was a welcome surprise to us, and we are delighted with the end result.We highly recommend Allied Welsh for these reasons.
tony blakemoretony blakemore
13:21 04 Oct 22
We would like to say that dealing with Allied Welsh from start to finish has been the most stress-free experience we have ever had with any builders. The professionalism of all your team has been a credit to your company, nothing has been too much trouble for them even when we have had to make an adjustment here and there. Our property was always left clean and tidy when they left after a day’s work and on the occasions, we were away we had no anxiety leaving the house empty, they simply got on with it. The finished job exceeded our expectations, we would recommend Allied Welsh to anyone without hesitation
Gary WilliamsGary Williams
16:35 10 May 22
We found Allied Welsh to be of the highest quality for all aspects of our loft conversion. They were professional in all depts when dealing with them from the initial quotation work through to the finial installation. The installation team were very respectful around our house and were clean and tidy within minimal disruption to our house and life for 6 weeks. The work they carried out was of the highest standard and we’re always open to questions with regards to the stages of the work being undertaken. The office team were always very quick to respond to questions and when we added additional work they provided quick accurate quotes.The initial quote was very accurate and paid several visits to ensure we understood all aspects of the price against the work involved. There were no hidden costs declared during the build which shows complete integrity which provided us the ability to manage the costs of the build over the project. This is particularly prevelant in this current climate with material costs changing by the week and we paid exactly what we were quoted for several months prior to the start of the workWe can’t thank Allied enough and would highly recommend them for aspects of work for house renovation.Mr Williams
Ian DIan D
22:50 07 May 22
An excellent company. We are so pleased with how out attic conversion turned out. Professional, polite and communication was brilliant. Highly recommended!!!!
Kevin McKeeverKevin McKeever
14:30 06 May 22
I can definelty recommend Allied Welsh. They built our loft conversion and were excellent in timing and communicating what would get done and when. They were always available to answer any questions. Every step was great and there was no stress. We are very happy with the end result. Thanks so much Allied Welsh, you have an amazing team.
Louise WebbLouise Webb
10:31 13 Nov 21
We had our loft completed by Allied Welsh in 2019, we were so so impressed with their work. They were professional, clean, tidy, hardworking and friendly, we couldn’t have asked for more. We love our new bedroom and it was completed to such a high standard, would highly recommend them
Andy DanfordAndy Danford
08:44 12 Oct 21
We've lived in our house for over 30 years and have used a number of builders for various improvements. Allied Welsh are by far the best of these. Their whole operation was highly professional from design to execution. The various tradesmen that came to our house were very skilled, highly committed to their work and always sympathetic to our needs. They communicated with us regularly to let us know their daily plans. Unlike many builders we have used in the past the team was with us every day, from day one to completion. As a result our loft conversion was completed in good time and very efficiently. We are very pleased with the results. In short, we would recommend Allied Welsh unreservedly.
Steve HastingsSteve Hastings
15:54 28 Jul 21
Everybody who has viewed the conversion has been very complementary about its design and build quality. We are glad that we went with Allied Welsh and I would recommend others follow us.The Installation Director and all of the Allied teams tried very hard to make it easier for us, always answered any concerns that we had and always tidied up at the end of each day. They were always considerate, always polite and friendly to both us and our neighbours, they are real gentlemen.
Dave GrayDave Gray
08:23 05 Jun 21
We have to say the quality, service and communication from Allied Welsh from start to completion has been completely superb.... working within the construction industry myself, I can testify that Allied Welsh deliver to the highest of standards, having several decades of experience, from the initial survey to the really polite & professional site teams who carry out the works (from carefully setting out dust sheets throughout the house at the start of the day, to vacuuming & cleaning up up at the end)..... can’t recommend them highly enough and would not hesitate to use them again, either personally or professionally
Gavin RichardsGavin Richards
16:22 21 Dec 20
Amazing service from start to finish. Works completed to exceptional quality and on time with what felt like an exceptional personal service. We love our double extension and highly recommend.
karen hearnkaren hearn
12:14 21 Dec 20
Completed loft conversion on time, which we are very happy with. Excellent work team, always turned up on time, respectful to other parts of the house and family members, excellent workmanship. I am happy to recommend them.
Matthew RobertsMatthew Roberts
21:23 15 Dec 20
Having seen previous conversions undertaken by Allied Welsh , we decided to use Allied Welsh for a loft conversion with an en suite bathroom and they were a pleasure to deal with throughout and made the process as painless as possible taking care of every stage from inital consultation , planning applicaiton and on siteThe quality of the work was superb in every respect and any queries raised were responded to immediately.For the 10 or so weeks that the project took each day they arrived exactly on time and every day left the house in an immaculate state as well and we were always kept informed as to the progress of the worksThis was an extensive project which I can find no fault with at all. I would highly recommend without reservation
Becky KelwayBecky Kelway
20:36 26 Oct 20
We are delighted with the work delivered by the Allied Welsh team. They are simply wonderful ! They work hard and have given us an excellent new floor and roof. Their staff are all polite, professional and always tidy up. Big thanks to the whole team for their commitment and top communications from start to finish.

Find our work in your area

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Get in touch

Send an enquiry or give us a call to arrange your free survey and fixed price quotation.

Unit 2 Del Guerra Court, Gelligron Ind Est, Tonyrefail CF39 8ES

0800 458 3334