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The Building Constructor House extension builders

The Building Constructor House extension builders

5.0(7 reviews)See reviews ↓·London

About the company

The Building Constructor is a house extension and loft conversion specialist serving Greater London and surrounding areas within the M25. Its teams operate seven days a week across London. The company manages the entire construction process from architectural design and planning permission guidance to structural work and building regulations compliance, working with architects and structural engineers.

It specialises in rear, side and double-storey wrap around extensions. Loft conversion services include dormer, mansard, and hip-to-gable conversions. Main services include new builds, extensions, loft conversions, refurbishments, garage and outhouse renovations, bathroom and kitchen refurbishments, driveways, and porches. The company offers a guarantee on its house extension and loft conversion work.

What customers say

Based on genuine customer reviews

Extensions that go beyond the original brief are a recurring theme, with reviewers describing projects where the finished space matched or exceeded what had been discussed beforehand. Craftsmanship comes up repeatedly, and customers highlight the care and delicacy applied to finishing work in lofts and rear additions, including two-storey structures. Staged payment arrangements are frequently mentioned, allowing households to pay as each phase of construction advances rather than parting with the full sum at the outset, a point several reviewers raise when explaining why they felt comfortable proceeding.

Consultation during the build is another common thread, with clients noting that decisions were put to them at each stage rather than imposed. The team is portrayed as helpful and straightforward, and free quotations without pressure selling are part of the experience described. Referrals and repeat work appear strongly, since one household returned to discuss a second property after a profitable first project, while another booked loft work once earlier stages were finished. A full renovation of an auction home features among the accounts, indicating the range of residential work undertaken around the area.

The Building Constructor House extension builders — Customer photo

Reviews

Reviews are taken from publicly available sources.

FH
Fester hanworth17 August 2026

Perfect house extension execution this summer, i was told about the BC Group by our neighbour who’s aunt had used them recently for a loft and wrap around and apparently the workmanship and overall service with price was just incredible. The building constructor is definitely a hidden gem in the home builders category in west London, easy to recommend such a firm when they have pay as you go and the best completion times as well as the better price & a price match promise. Filled online form with plans attached or ready to reply with and a month later we were underway, highly recommended

JP
Julian perez25 June 2026

We went for a total revues of an auction home and very young in the developing game but very lucky to have found such honest team near us, not far from ealing, this residential building firm are one of the best groups around and we are now discussing second property, made a good profit first time around so why change what’s working rite ? I would definitely take the Free quotations without pressure sales tactics , go for it

CA
Christopher Aldridge6 March 2026

The BC Group helped Transform our home, couldn't be happier, We hired Home Builders for a two storey wrap around extension on our Ealing home and honestly it's exceeded what we had in our heads from day one. We had quite a specific brief, we wanted the extra space to work properly for our family, particularly giving our teenage daughters their own area with a bit of privacy, and they completely got it without us having to over-explain. The whole process was smoother than we expected for a project this size. They kept us updated throughout, flagged any decisions we needed to make early enough that nothing held up the build, and the site was always managed tidily. Tradespeople they brought in were all decent and clearly used to working alongside each other. The finish is really good. Everything was done with care, not just the structural stuff but the details too, which is where a lot of builders fall short. Came in on time and close enough to budget that we weren't stressed about it. We're already booked in with them for a loft conversion next summer which probably says everything really. When you find a builder you can actually trust to do it right, you stick with them. Would absolutely recommend to anyone in the area looking to extend or improve their home. Proper job.

HR
Hazel Rowe5 November 2024

Good contractor for new builds and a speciality for extending features of the home , double story was taken by them and we were very impressed , will use again

RM
RICHARD MITCHELL7 December 2023

good builders and would use again, they were the best extension builders by a mile, we used one bodge job guy that came accross pro but his team were bad at construction, i can tell you that ive had many experiences with them in the past and when i met this team and saw the work, i was really taken back by the care and delicacy they put in

SG
Steven Gillingham22 August 2023

we set up a payment plan for stage work after looking at other experiences of customers and it's a great little plan that allows you to see step by step in stages and not have the need to part with hard-earned money all at once, starting with the ground floor extension at rear side we already saw how dedicated the team was to show off there craftsmanship and trust, we ended up with a 2 story extension and now have the loft area booked in for august which they will attend to when we are on holiday. Once that's all been applied we have spoken to the team to help us with our property venture and looking to keep long term ties to this company

JM
Jeffrey Mowbray29 October 2022

good bunch of guys and very helpful, every little detail in our loft and extension was exactly what we asked for and every step of the build we were asked most choices. The detail of finishing is good and the extension still has a around 2 days painting to be done but apart from that , all looks lovely , I can relax and revalue next few weeks and now have peace of mind for my kids too, ifs important to get a builder because of these points and I can honestly share there details with family , lovely

House extensions in London compared

Ordered by rating, weighted by the number of reviews — businesses with only a handful of reviews do not jump to the top automatically. 8 businesses in this category in London are compared.

RankProviderRatingReviewsOpen Sat.
1My Extension PM Limited★ 5,0100No
2The London House Extensions★ 5,026No
3QualityBuild Hackney House Extensions★ 5,023Yes
4Up-Great Ltd Builders I Refurbishment and Extensions★ 5,021Yes
5The Building Constructor House extension builders (this page)★ 5,07Yes
Contact
Working hours
Monday07:00–21:00
Tuesday07:00–21:00
Wednesday07:00–21:00
Thursday07:00–21:00
Friday07:00–21:00
Saturday07:00–21:00
Sunday07:00–20:00