Extend your TW2 with an extension

A flat roof extension is a great way to add extra space to your home without splashing out on the costs of a pitched roof extension. Often exempt from planning permission rules, you can build a flat roof extension up to 3 metres in height as long as it's not visible from a road. But how much do they cost in TW2?

Build a flat roof extension cost in TW2 - Sort by rates or availability

J&J Building Solutions

From £22,048

(rates verified 18/09/26)

Location

Streatham, SW16

Experienced extension builder ready to quote for your work. J&J Building Solutions is the best extension builder in TW2. No obligation free quotes ...

Ferdas Design & Build Ltd

From £22,504

(last active 02/10/26)

Location

Acton London, W3

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...

1 review

Torrington

From £22,192

(last active 02/10/26)

Location

london, EC2A

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 £22,024

(last active 02/10/26)

Location

Moorfields Eye Hospital, EC1V

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 £22,312

(last active 02/10/26)

Location

Yeading, UB4

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

Samuele Paolini

From £22,392

(last active 01/10/26)

Location

Cricklewood, NW2

Need an Extension Builder in TW2? Samuele Paolini has been helping local clients (5 mile radius) with their extension buildering jobs for many yea...

VA Structures

From £22,192

(last active 01/10/26)

Location

Hounslow, TW5

Need an Extension Builder in TW2? VA Structures has been helping local clients (10 mile radius) with their extension buildering jobs for many years...

DC Build & Pave

From £22,280

(last active 01/10/26)

Location

Yeading, UB4

Trusted and professional extension builder in TW2. Experienced in all extension buildering work and keeping within budget and on quote. DC Build & ...

Ali & Sons Builders

From £22,152

(last active 01/10/26)

Location

LONDON, SW11

I am a qualified, builder, electrician and plumber. I have been working in the construction industry for over 23 years and have built everything fr...

The Diamond Property Service Ltd

From £22,304

(last active 01/10/26)

Location

Acton London, W3

Hi we have 15 years of experience in building and construction industry our specialization is bathrooms and renovations please have a look at the w...

Flat roof extension cost in TW2

Estimates for build a flat roof extension near TW2

A flat roof extension ranges from the cheapest of £22,024 (SH Enterprise based in EC1V) to the dearest of £22,504 (Ferdas Design & Build Ltd based in W3), but these are just estimates. While they give you an idea of who will be better value, the best way to compare costs is to get real quotes. 

Find out how much your flat roof extension will cost in TW2 by posting a job with HaMuch. We'll send it to extension builders in TW2.


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Estimates for common extension builder jobs in TW2;

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

Underpin a building - £17,740

Two storey extension

Two storey extension - £88,360

Build a timber frame extension

Build a timber frame extension - £26,240

Build a swimming pool

Build a swimming pool - £81,240

Single storey extension

Single storey extension - £59,800

Side return extension

Side return extension - £44,200

Install an RSJ

Install an RSJ - £2,440

Outbuilding

Outbuilding - £10,240

Build a Mansard loft conversion

Build a Mansard loft conversion - £52,240

Loft conversion

Loft conversion - £36,000

Build a kitchen extension

Build a kitchen extension - £42,240

Hip to gable loft conversion

Hip to gable loft conversion - £42,240

Granny annexe

Granny annexe - £87,240

Garden office

Garden office - £10,240

Convert a Garage

Convert a Garage - £16,240

Garage

Garage - £18,740

Build a flat roof extension

Build a flat roof extension - £22,240

Build a dormer loft conversion

Build a dormer loft conversion - £42,240

Concrete foundations

Concrete foundations - £6,490

Convert a bungalow loft

Convert a bungalow loft - £29,240

Convert a basement

Convert a basement - £40,200

More extensions & conversions cost guides...