Build a single storey extension in LL55 from £40,120

Single storey extension cost in LL55 - Sort by rates or availability

Property Maintenance Solutions

From £45,400

(last active 24/09/26)

Location

Tyn-y-gongl, LL74

Relax... you have found a reliable extension builder in LL55. Property Maintenance Solutions is a friendly and reliable company based in LL55 who c...

Hughes Construction

From £49,400

(last active 31/08/26)

Location

Bangor, LL57

Need an Extension Builder in LL55? Hughes Construction has been helping local clients (20 mile radius) with their extension buildering jobs for man...

Balmoral joinery/construction

From £49,880

(last active 31/08/26)

Location

Gaerwen, LL60

Fiting of door internal/external All joinery work from new joists to fitting off skirting boards Kitchen fitting Staircase or replac...

Chris's Roofing & Property Maintenance

From £51,000

(last active 07/08/26)

Location

Deganwy, LL31

Need an Extension Builder in LL55? Chris's Roofing & Property Maintenance has been helping local clients (20 mile radius) with their extension buil...

W F CLAYTON & CO LTD

From £49,560

(last active 12/06/26)

Location

Bangor, LL57

Need to find an Extension Builder near you for all your extension buildering work?

W F CLAYTON & CO LTD provides a local, trusted extension...

Glyndwr Roofing & Building Services

From £45,560

(last active 12/06/26)

Location

Holyhead, LL65

Glyndwr Roofing & Building Services are here to help customers who need an Extension Builder in LL55. We offer a competitive rate to complete all y...

Building & Flat Roofing Contractors

From £40,120

(last active 05/03/26)

Location

Caernarfon, LL54

Building & Flat Roofing Contractors is a trusted extension builder serving customers in LL55 and the surrounding area. Contact us to today to get a...

WJ Builders

From £43,640

Location

Pwllheli, LL53

WJ Builders is an established and experienced local extension builder in LL55. Please contact us for a free, no obligation quote and competitive ra...

Extension builder estimates (based on hourly rates) to build a single storey extension in LL55

Estimates for single storey extension near LL55

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Get extension builder rates instantly (excluding VAT or callout charges)
Location in UKHourly RateDaily Rate
Single Storey Extension near Conwy£28£211
Single Storey Extension near Conway£28£211
Single Storey Extension near Llandudno£28£211
Single Storey Extension near Colwyn Bay£28£211

Estimates for common extension builder jobs in LL55;

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 - £17,091

Two storey extension

Two storey extension - £87,387

Build a timber frame extension

Build a timber frame extension - £25,591

Build a swimming pool

Build a swimming pool - £80,591

Single storey extension

Single storey extension - £46,820

Side return extension

Side return extension - £36,899

Install an RSJ

Install an RSJ - £1,791

Outbuilding

Outbuilding - £9,591

Build a Mansard loft conversion

Build a Mansard loft conversion - £51,591

Loft conversion

Loft conversion - £29,916

Build a kitchen extension

Build a kitchen extension - £41,591

Hip to gable loft conversion

Hip to gable loft conversion - £41,591

Granny annexe

Granny annexe - £86,591

Garden office

Garden office - £9,591

Convert a Garage

Convert a Garage - £15,591

Garage

Garage - £18,091

Build a flat roof extension

Build a flat roof extension - £21,591

Build a dormer loft conversion

Build a dormer loft conversion - £41,591

Concrete foundations

Concrete foundations - £5,841

Convert a bungalow loft

Convert a bungalow loft - £28,591

Convert a basement

Convert a basement - £32,899

More extensions & conversions cost guides...