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Reid and Co Developments Ltd
Jay Reid
"Concrete foundation" - W1T, job posted 16/10/25
CK Constructions & Development Ltd
CK Constructions & Development Ltd is a trusted extension builder serving customers in Mayfair and the surrounding area. Contact us to today to get...
A to Z Builders Ltd
A to Z Builders Ltd are here to help customers who need an Extension Builder in Mayfair. We offer a competitive rate to complete all your extension...
JK Doors
JK Doors is a trusted extension builder serving customers in Mayfair and the surrounding area. Contact us to today to get a competitive quote for e...
JM Building Services
JM Building Services is a trusted extension builder serving customers in Mayfair and the surrounding area. Contact us to today to get a competitive...
Buildwiser
Buildwiser is a trusted extension builder serving customers in Mayfair and the surrounding area. Contact us to today to get a competitive quote for...
F & F Building Services
F & F Building Services is an established extension buildering business in Mayfair. We come highly recommended and provide competitive quotes for y...
Q Lofts and Extensions
Anthony Sullivan
We build Lofts. We build Extensions. We undertake conversions. Our Terms and conditions apply as shown in our starter packs.
£42/hr
£269/day
plansing
Plansing Ltd
Experience the best architectural design services with PLANSING, where we flawlessly integrate innovative architectural designer products to bring ...
£26/hr
£26/day
London Design And Build
London Design And Build
Here at London Design and Build, our team of architects, interior designers, structural engineers and contractors, offer a bespoke, turn-key servic...
£45/hr
£280/day
Homeconcepts
Need to find an Extension Builder near you for all your extension buildering work?
Homeconcepts provides a local, trusted extension builder...
£48/hr
£303/day
Masters Construction UK
Joel Cayless white
20 years experience in high end carpentry, joinery and furniture making
£42/hr
£262/day
Pillar Contractors Ltd
Need to find an Extension Builder near you for all your extension buildering work?
Pillar Contractors Ltd provides a local, trusted extensi...
£50/hr
£309/day
We Love Build
We are a Design and Build Company, based in London.We focus on super prime and luxury residential renovations in and around London and internationa...
£41/hr
£255/day
We Love Build - Three Arches
We Love Build - Three Arches is an established extension buildering business in Mayfair. We come highly recommended and provide competitive quotes ...
£41/hr
£253/day
Luxe Refurbs
Luxe Refurbs is an established extension buildering business in Mayfair. We come highly recommended and provide competitive quotes for your work.
£42/hr
£261/day
Dominic Payte - Design & Build
Dominic Payte - Design & Build is an established extension buildering business in Mayfair. We come highly recommended and provide competitive quote...
£48/hr
£300/day
Starfish Properties
Starfish Properties is a trusted extension builder serving customers in Mayfair and the surrounding area. Contact us to today to get a competitive ...
£42/hr
£263/day
The Maybria Group
Trusted and professional extension builder in Mayfair. Experienced in all extension buildering work and keeping within budget and on quote. The May...
£47/hr
£294/day
Mayfair Design
Experienced extension builder ready to quote for your work. Mayfair Design is the best extension builder in Mayfair. No obligation free quotes and ...
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Use these steps to find Extension Builders in Mayfair for FREE!
- Post your job: Click "Get quotes" and briefly describe your job.
- Enter your details: We’ll match you with Extension Builders in Mayfair. We’ll notify you via text or email when an Extension Builder is available to quote.
- Select your Extension Builder: Compare Extension Builders interested in working with you. You can use HaMuch to safely message local Mayfair Extension Builders or phone them directly - you’re in control!
Local Extension Builders in London Boroughs
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 - £26,240
Garden office - £10,240
Granny annexe - £87,240
Build a flat roof extension - £22,240
Convert a Garage - £16,240
Hip to gable loft conversion - £42,240
Convert a bungalow loft - £29,240
Build a dormer loft conversion - £42,240
Build a swimming pool - £81,240
Build a Mansard loft conversion - £52,240
Concrete foundations - £6,490
Underpin a building - £17,740
Two storey extension - £88,360
Convert a basement - £40,200
Side return extension - £44,200
Loft conversion - £36,000
Garage - £18,740
Single storey extension - £59,800
Outbuilding - £10,240
Install an RSJ - £2,440
Build a kitchen extension - £42,240
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