Name: Extension Builder
Brand: HaMuch
SKU: extension-renovation
Rating: 4.63 (4 reviews)

Find affordable CM20 extension builders now

Extension builders rates in CM20 range from £36/hour £230/day (THE ROMAN BUILDING COMPANY) to £81/hour £644/day (Essex loft extensions Ltd ). To see prices and availability now for your job click green button.

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"Loft conversion" - HARLOW, job posted 27/05/26

"Kitchen extension" - HARLOW, job posted 30/12/25

"We have a long list of customers that need only a builder that can fit conservatory. We don’t need supplier. Please contact us if you can help. Thanks" - CM18, job posted 28/07/25

"Single storey extension" - HARLOW, job posted 17/02/25

Compare CM20 extension builders rates

Compare CM20 extension builders rates (excluding VAT or callout charges)
Location in UK	Hourly Rate	Daily Rate
Extension Builders near Harlow	£43	£288
Extension Builders near Hoddesdon	£46	£296
Extension Builders near Ware	£47	£296
Extension Builders near Bishop's Stortford	£42	£264
Extension Builders near Cheshunt	£48	£285
Extension Builders near Epping Forest	£44	£274
Extension Builders near Hertford	£46	£290
Extension Builders near Loughton	£44	£273
Extension Builders near East Hertfordshire	£44	£289
Extension Builders near Welwyn Garden City	£42	£269

Job estimates from extension builders near you

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.

Build a timber frame extension - £26,328

Garden office - £10,328

Granny annexe - £87,328

Build a flat roof extension - £22,328

Convert a Garage - £16,328

Hip to gable loft conversion - £42,328

Convert a bungalow loft - £29,328

Build a dormer loft conversion - £42,328

Build a swimming pool - £81,328

Build a Mansard loft conversion - £52,328

Concrete foundations - £6,578

Underpin a building - £17,828

Two storey extension - £88,492

Convert a basement - £41,190

Side return extension - £45,190

Loft conversion - £36,825

Garage - £18,828

Single storey extension - £61,560

Outbuilding - £10,328

Install an RSJ - £2,528

Build a kitchen extension - £42,328

More extensions & conversions cost guides...

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Appliance Repair Specialist

Conservatory Specialist