Build a single storey extension in W1T from £54,520

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Single storey extension cost in W1T - Sort by rates or availability

From £101,400

(last active 05/10/26)
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Reid and Co Developments Ltd

Jay Reid

Location

London, NW8

We are a well established buildng firm who have been providing building services and managing of projects now for 25 years. We have all the necessary ...

From £62,520

(last active 29/09/26)
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CK Constructions & Development Ltd

Location

Russell Square, WC1N

CK Constructions & Development Ltd is a trusted extension builder serving customers in W1T and the surrounding area. Contact us to today to get a c...

From £54,520

(last active 29/09/26)
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A to Z Builders Ltd

Location

Houses of Parliament, SW1P

A to Z Builders Ltd are here to help customers who need an Extension Builder in W1T. We offer a competitive rate to complete all your extension bui...

From £54,680

(last active 28/09/26)
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JK Doors

Location

Fitzrovia, W1W

JK Doors is a trusted extension builder serving customers in W1T and the surrounding area. Contact us to today to get a competitive quote for exten...

From £55,800

(last active 15/09/26)
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JM Building Services

Location

Hatton Garden, EC1N

JM Building Services is a trusted extension builder serving customers in W1T and the surrounding area. Contact us to today to get a competitive quo...

From £67,800

(last active 01/09/26)
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ELJHANI BUILDING & PROPERTY MANAGEMENT SERVICES LTD

Hussein Eljhani

Location

Newcastle upon Tyne, NE4

We are highly professional Builders Company, hones pricing and reliable, we leave all areas clean and tidy.

From £59,320

(last active 07/08/26)
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Buildwiser

Location

King's Cross, WC1X

Buildwiser is a trusted extension builder serving customers in W1T and the surrounding area. Contact us to today to get a competitive quote for ext...

From £60,120

(last active 05/08/26)
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F & F Building Services

Location

Houses of Parliament, SW1P

F & F Building Services is an established extension buildering business in W1T. We come highly recommended and provide competitive quotes for your ...

From £96,280

(last active 12/11/25)
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Q Lofts and Extensions

Anthony Sullivan

Location

London, EC1R

We build Lofts. We build Extensions. We undertake conversions. Our Terms and conditions apply as shown in our starter packs.

From £58,040

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plansing

Plansing Ltd

Location

london, W1W

Experience the best architectural design services with PLANSING, where we flawlessly integrate innovative architectural designer products to bring ...

Extension builder estimates (based on hourly rates) to build a single storey extension in W1T

Estimates for single storey extension near W1T

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Estimates for common extension builder jobs in W1T;

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 - £18,102

Two storey extension

Two storey extension - £88,904

Build a timber frame extension

Build a timber frame extension - £26,602

Build a swimming pool

Build a swimming pool - £81,602

Single storey extension

Single storey extension - £67,048

Side return extension

Side return extension - £48,277

Install an RSJ

Install an RSJ - £2,802

Outbuilding

Outbuilding - £10,602

Build a Mansard loft conversion

Build a Mansard loft conversion - £52,602

Loft conversion

Loft conversion - £39,398

Build a kitchen extension

Build a kitchen extension - £42,602

Hip to gable loft conversion

Hip to gable loft conversion - £42,602

Granny annexe

Granny annexe - £87,602

Garden office

Garden office - £10,602

Convert a Garage

Convert a Garage - £16,602

Garage

Garage - £19,102

Build a flat roof extension

Build a flat roof extension - £22,602

Build a dormer loft conversion

Build a dormer loft conversion - £42,602

Concrete foundations

Concrete foundations - £6,852

Convert a bungalow loft

Convert a bungalow loft - £29,602

Convert a basement

Convert a basement - £44,277

More extensions & conversions cost guides...