From £18,508
Over 35 years experience
We are Gas Safe registered
We are Verified
We pride ourselves on great custom...
1 review
From £18,692
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
From £18,892
Need an Extension Builder in RM3? Samuele Paolini has been helping local clients (5 mile radius) with their extension buildering jobs for many yea...
From £18,652
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...
From £19,524
Buci builders ltd is a trusted extension builder serving customers in RM3 and the surrounding area. Contact us to today to get a competitive quote ...
From £18,812
Local Boiler Plumbing & Heating Services is an established and experienced local extension builder in RM3. Please contact us for a free, no obligat...
From £18,684
Experienced extension builder ready to quote for your work. CC&D BUILDING LTD is the best extension builder in RM3. No obligation free quotes and m...
From £18,684
Relax... you have found a reliable extension builder in RM3. First guard Roofing is a friendly and reliable company based in RM3 who consider no jo...
From £19,116
HOUSE BUILDING SERVICES LIMITED is a trusted extension builder serving customers in RM3 and the surrounding area. Contact us to today to get a comp...
From £18,380
Member since August 2025
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...

Builders charge between £18,380 (Can design and Construction based in Ig11) and £19,524 (Buci builders ltd based in SE27) in RM3 to build a garage, but these costs are only estimates.
Comparing extension builders estimates for building a garage gives you an idea of who will be better value, but the best way to compare costs is to get actual quotes.
Get real quotes to build a new garage in RM3 by posting a job with HaMuch and we will send it to extension builders in RM3.
| Borough in London |
|---|
| Garage in Harold Hill |
| Garage in Gidea Park |
| Garage in Emerson Park |
| Garage in Romford |
| Garage in Collier Row |
| Garage in Rush Green |
| Garage in harold Wood |
| Garage in Hornchurch |
| Garage in Upminster |
| Garage in Stapleford Abbotts |
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 - £17,794

Two storey extension - £88,442

Build a timber frame extension - £26,294

Build a swimming pool - £81,294

Single storey extension - £60,888

Side return extension - £44,812

Install an RSJ - £2,494

Outbuilding - £10,294

Build a Mansard loft conversion - £52,294

Loft conversion - £36,510

Build a kitchen extension - £42,294

Hip to gable loft conversion - £42,294

Granny annexe - £87,294

Garden office - £10,294

Convert a Garage - £16,294

Garage - £18,794

Build a flat roof extension - £22,294

Build a dormer loft conversion - £42,294

Concrete foundations - £6,544

Convert a bungalow loft - £29,294

Convert a basement - £40,812