From £51,960
Greater London, N8
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £52,120
We have worked with homeowners all over London and designers to produce work we think you'll love. Our past projects include both new construction ...
From £52,400
Experienced extension builder ready to quote for your work. SSS Brothers Limited is the best extension builder in N8. No obligation free quotes and...
From £52,344
Need an Extension Builder in N8? BM Lofts Limited has been helping local clients (5 mile radius) with their extension buildering jobs for many year...
From £52,256
Michael Collins Builders are experts in domestic conversions and extensions - drawing on over 25 years experience in the trade. We have built up a ...
From £51,920
Need to find an Extension Builder near you for all your extension buildering work?
OAKWOOD CONSTRUCTION UK LTD provides a local, trusted ex...
From £52,040
London Metropolitan Construction Ltd is and property refurbishment and renovation company based and operating throughout London undertaking new bui...
From £52,024
Whether it's garden design, a garden studio or home renovations - we can do it. What you show me, what you imagine, we can build. Contact us now fo...
From £52,368
Relax... you have found a reliable extension builder in N8. CM Build is a friendly and reliable company based in N8 who consider no job as too big ...
From £52,336
We make the adage ‘House is where the heart is’, a reality for the house-owners.We are an empathetic housebuilder that delivers elegance and du...

Mansard loft conversions range from the cheapest installation of £51,920 (OAKWOOD CONSTRUCTION UK LTD based in N22) to the dearest of around £52,400 (SSS Brothers Limited based in N15).
While these estimates give you a good idea how much you'll pay for a mansard loft conversion, the only way to get an accurate price is to get real quotes from real builders.
Get quotes to install a mansard loft conversion in N8 by posting a job with HaMuch and we'll send it to extension builders in N8.
Whether you’re looking to extend your kitchen with a side return extension or you want to convert your basement into a liveable space, read our cost guides to get an idea of how much each project costs before getting a more accurate quote from our database of reliable tradespeople.

Underpin a building - £17,677

Two storey extension - £88,265

Build a timber frame extension - £26,177

Build a swimming pool - £81,177

Single storey extension - £58,536

Side return extension - £43,489

Install an RSJ - £2,377

Outbuilding - £10,177

Build a Mansard loft conversion - £52,177

Loft conversion - £35,408

Build a kitchen extension - £42,177

Hip to gable loft conversion - £42,177

Granny annexe - £87,177

Garden office - £10,177

Convert a Garage - £16,177

Garage - £18,677

Build a flat roof extension - £22,177

Build a dormer loft conversion - £42,177

Concrete foundations - £6,427

Convert a bungalow loft - £29,177

Convert a basement - £39,489