Build additional living space on your property in TW15

A granny annexe is the ideal solution for offering a young family member their own space in your home while they save up for their own house, or to help an older relative have some independence while keeping them at a safe distance. But how much do they cost to build in TW15?

Granny annexe cost in TW15 - Sort by rates or availability

J&J Building Solutions

From £87,048

(rates verified 18/09/26)

Experienced extension builder ready to quote for your work. J&J Building Solutions is the best extension builder in TW15. No obligation free quotes...

Ferdas Design & Build Ltd

From £87,504

(last active 02/10/26)

At Ferdas Design & Build Ltd we have been fitting bespoke bathrooms since 2013. We pride ourselves on being the go-to bathroom fitters for discerni...

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1 review

Torrington

From £87,192

(last active 02/10/26)

NIECEIC / NAAPIT GASSAFE WATER REGULATIONS We offer services towards completion of high end construction projects to dis...

"Did callout made safe my elctrical work thanks" - reviewed 16/05/23, REECYRUSSO

SH Enterprise

From £87,024

(last active 02/10/26)

Need the extension buildering job done quickly without breaking the bank? SH Enterprise offer fast, reliable, and affordable extension buildering s...

T M Builder

From £87,312

(last active 02/10/26)

Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...

Aerea

From £87,336

(last active 01/10/26)

Aerea is a trusted extension builder serving customers in TW15 and the surrounding area. Contact us to today to get a competitive quote for extensi...

Samuele Paolini

From £87,392

(last active 01/10/26)

Need an Extension Builder in TW15? Samuele Paolini has been helping local clients (5 mile radius) with their extension buildering jobs for many ye...

ABC Associates STRUCTURES 4 U

From £87,280

Member since August 2026

Relax... you have found a reliable extension builder in TW15. ABC Associates STRUCTURES 4 U is a friendly and reliable company based in TW15 who co...

VA Structures

From £87,192

(last active 01/10/26)

Need an Extension Builder in TW15? VA Structures has been helping local clients (10 mile radius) with their extension buildering jobs for many year...

DC Build & Pave

From £87,280

(last active 01/10/26)

Trusted and professional extension builder in TW15. Experienced in all extension buildering work and keeping within budget and on quote. DC Build &...

Granny Annexe Cost in TW15

Estimates for granny annexe near TW15

Building a granny annexe ranges from £87,024 (SH Enterprise based in EC1V) to £87,504 (Ferdas Design & Build Ltd based in W3), but these are just estimates that can help give you an idea of who will be better value in your area.

The best thing to do is to get quotes to build a granny annexe in TW15 by posting a job with HaMuch. We will send it to extension builders in TW15 who will be happy to help you.


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Estimates for common extension builder jobs in TW15;

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.

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