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From £41,880
Erald Kanani
Member since August 2025
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
Relax... you have found a reliable extension builder in Thamesmead. Sevcan Construction is a friendly and reliable company based in Thamesmead who ...
Kunshi Services UK Ltd is a trusted extension builder serving customers in Thamesmead and the surrounding area. Contact us to today to get a compet...
Tommy House
HOUSE BUILDING SERVICES LIMITED is a trusted extension builder serving customers in Thamesmead and the surrounding area. Contact us to today to get...
Need an Extension Builder in Thamesmead? MONOLITH CONSTRUCTION LTD has been helping local clients (10 mile radius) with their extension buildering ...
Buildem Ltd is a trusted extension builder serving customers in Thamesmead and the surrounding area. Contact us to today to get a competitive quote...
Relax... you have found a reliable extension builder in Thamesmead. Derryard Construction Ltd is a friendly and reliable company based in Thamesmea...
Trusted and professional extension builder in Thamesmead. Experienced in all extension buildering work and keeping within budget and on quote. AM B...
Philip Boateg
Need to find an Extension Builder near you for all your extension buildering work?
PFM General Building Services Ltd provides a local, trus...
Experienced extension builder ready to quote for your work. Liviu Toma is the best extension builder in Thamesmead. No obligation free quotes and m...

In Thamesmead, prices for dormer loft conversions range from £41,880 (Can design and Construction based in Ig11) to £42,616 (HOUSE BUILDING SERVICES LIMITED based in DA16), but how much your conversion costs will vary depending on the size of your property, how easy access to your roof is and what you want to use the space for.
The best way to get an accurate price is to compare quotes from extension builders in Thamesmead. Post your job on HaMuch now and we'll put you in touch with available extension builders.
"Dormer loft conversion" - THAMESMEAD, job posted 01/01/70
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 - £17,740

Two storey extension - £88,360

Build a timber frame extension - £26,240

Build a swimming pool - £81,240

Single storey extension - £59,800

Side return extension - £44,200

Install an RSJ - £2,440

Outbuilding - £10,240

Build a Mansard loft conversion - £52,240

Loft conversion - £36,000

Build a kitchen extension - £42,240

Hip to gable loft conversion - £42,240

Granny annexe - £87,240

Garden office - £10,240

Convert a Garage - £16,240

Garage - £18,740

Build a flat roof extension - £22,240

Build a dormer loft conversion - £42,240

Concrete foundations - £6,490

Convert a bungalow loft - £29,240

Convert a basement - £40,200