Extend your Chepping Wycombe 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 Chepping Wycombe?

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

ABC Associates STRUCTURES 4 U

From £22,280

Member since August 2026

Location

Marlow, SL7

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

VA Structures

From £22,192

(last active 01/10/26)

Location

Heston Hounslow, TW5

Need an Extension Builder in Chepping Wycombe? VA Structures has been helping local clients (10 mile radius) with their extension buildering jobs f...

DC Build & Pave

From £22,280

(last active 01/10/26)

Location

Yeading, UB4

Trusted and professional extension builder in Chepping Wycombe. Experienced in all extension buildering work and keeping within budget and on quote...

T M Builder

From £22,312

(last active 01/10/26)

Location

Yeading, UB4

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

DP Services

From £22,432

(last active 01/10/26)

Location

Berkshire, RG41

DP Services is a fully insured friendly local company which has been trading since 2002 and delivers high quality building work in domestic extensi...

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...

LALI BUILDERS

From £22,424

(last active 30/09/26)

Location

London, NW10

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

Nisup Building Services

From £21,920

(last active 30/09/26)

Location

Edgware, HA8

NISUP BUILDING SERVICES Company specializes in the domestic and commercial building industry :1. Refurbishm...

Krystian Wojasiewicz

From £22,432

(last active 30/09/26)

Location

London, HA9

Krystian Wojasiewicz is a trusted extension builder serving customers in Chepping Wycombe and the surrounding area. Contact us to today to get a co...

Platinum Premier Projects & Premier Electrics

From £22,432

(last active 30/09/26)

Location

Stanmore, HA7

Platinum Electrics is a Branch off Platinum Premier Projects who deal in all types of construction projects. Platinum Electrics are based in London...

Flat roof extension cost in Chepping Wycombe

Estimates for build a flat roof extension near Chepping Wycombe

A flat roof extension ranges from the cheapest of £21,920 (Nisup Building Services based in HA8) to the dearest of £22,432 (DP Services based in RG41), 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 Chepping Wycombe by posting a job with HaMuch. We'll send it to extension builders in Chepping Wycombe.


Get extension builder rates instantly

Get extension builder rates instantly (excluding VAT or callout charges)
Location in UKHourly RateDaily Rate
Build A Flat Roof Extension near Hazlemere£40£272
Build A Flat Roof Extension near High Wycombe£39£272
Build A Flat Roof Extension near Wycombe£39£271
Build A Flat Roof Extension near Maidenhead£41£273
Build A Flat Roof Extension near Gerrards Cross£43£282
Build A Flat Roof Extension near Chesham£42£277
Build A Flat Roof Extension near Slough£42£272
Build A Flat Roof Extension near Windsor & Maidenhead£42£272
Build A Flat Roof Extension near Rickmansworth£42£278
Build A Flat Roof Extension near Windsor£41£271

Estimates for common extension builder jobs in Chepping Wycombe;

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 - £17,801

Two storey extension

Two storey extension - £88,451

Build a timber frame extension

Build a timber frame extension - £26,301

Build a swimming pool

Build a swimming pool - £81,301

Single storey extension

Single storey extension - £61,016

Side return extension

Side return extension - £44,884

Install an RSJ

Install an RSJ - £2,501

Outbuilding

Outbuilding - £10,301

Build a Mansard loft conversion

Build a Mansard loft conversion - £52,301

Loft conversion

Loft conversion - £36,570

Build a kitchen extension

Build a kitchen extension - £42,301

Hip to gable loft conversion

Hip to gable loft conversion - £42,301

Granny annexe

Granny annexe - £87,301

Garden office

Garden office - £10,301

Convert a Garage

Convert a Garage - £16,301

Garage

Garage - £18,801

Build a flat roof extension

Build a flat roof extension - £22,301

Build a dormer loft conversion

Build a dormer loft conversion - £42,301

Concrete foundations

Concrete foundations - £6,551

Convert a bungalow loft

Convert a bungalow loft - £29,301

Convert a basement

Convert a basement - £40,884

More extensions & conversions cost guides...