Carnot Construction are an experienced building company based in East London.


We undertake all manner of building work, specialising in extensions, loft conversions, kitchen and bathroom installations.

We project manage your refurbishment project or home extension from beginning to end. Working closely with our clients to achieve their desired result.


Our team of onsite and support office staff are here to ensure your projects are completed on time, within budget and stress free.


We understand that building work carried out in the home can be a stressful experience, we aim to ensure our clients are fully informed and included in the building process all the way through.

Trades offered

Builder general
Loft conversions
General extension
Bathroom fitter
House Builder
Custom/Self Build
New build
Kitchen installation
Listed Buildings/Heritage
Listed Buildings specialist

Case studies

Muswell Hill Extension

  • 03 Feb 2020
  • Muswell Hill

Ground Floor Extension and Refurbishment

  • 03 Sep 2018

See more case studies

Customer reviews

16 Aug 2018

100% RECOMMENDED Michelle and her partner measured up and competitively quoted within a short space of time. She was then very patient and supportive when unforeseen planning issues popped up and set the start date back by quite some time. Once building started, all questions were promptly answered by either the site manager or Michelle, both being available at all times. I was away for the duration of most of the job and it was very reassuring to know that I was leaving it all in capable and honest hands. The workers were very proficient and tidied up after themselves at end of each day. They also put in some very long hours at times to hasten the work. I was also impressed by the handling of unexpected problems during the building (mainly invasive tree stumps!). I am absolutely thrilled with the end result. High quality workmanship and a beautiful building which I am sure will last many years. I would certainly recommend them without a doubt. - Catherine


16 Aug 2018

I'm a self-confessed fussy customer. And just having renovated my whole place - halfway furnished - I decided to touch the only room I said I wouldn't: the upstairs en suite! And with clearly not enough room to fit a cutting machine inside, I knew that tiles would likely need to be cut in the garden and walked through the house. The thought of the mess and the stress all over again was killing me. My original builders were becoming unreliable and I badly needed someone to come in and take the reins. That was Michelle. After contracting Carnot Construction, in hindsight, I could have booked a holiday for the duration of the works and still had peace of mind. Michelle made nothing seem like an issue and that gave me comfort and confidence from the beginning. Oleg, the on sight constant, is such a great builder. An all-rounder, efficient, friendly, punctual, tidy, trustworthy and extremely professional. He was great with adapting to my last minute decisions and did what it took to get the job done. A wall-to-wall, bathtub-to-ceiling one piece mirror? Done. After realising that the tiles I ordered were, in fact, small pieces of natural stone, Michelle quickly replaced our intended tiler for a stone specialist. He is hands down the best I've ever witnessed. All of the guys did a great job and I’m so pleased with my new bathroom. The only problem was that I didn’t meet them earlier! - Kane


10 Aug 2018

I am extremely pleased with the work Michelle and her crew carried out on a recent bathroom refurbishment. The work was done to a high standard and the staff were always polite. I would certainly recommend Carnot Construction and intend to use them again. - Eloh

Woodford Green