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SJ Expert Building Services
SJ Expert Building Services are here to help customers who need an Extension Builder in N19. We offer a competitive rate to complete all your exten...
SLS BUILDERS LIMITED
SLS BUILDERS LIMITED is a trusted extension builder serving customers in N19 and the surrounding area. Contact us to today to get a competitive quo...
First guard Roofing
Darren Bergin
Relax... you have found a reliable extension builder in N19. First guard Roofing is a friendly and reliable company based in N19 who consider no jo...
Andreas Thomas Demetri
Andreas Thomas Demetri is a trusted extension builder serving customers in N19 and the surrounding area. Contact us to today to get a competitive q...
DLER SINGH D S BUILDERS
DLER SINGH D S BUILDERS are here to help customers who need an Extension Builder in N19. We offer a competitive rate to complete all your extension...
From £2,544
BM Lofts Limited
Need an Extension Builder in N19? BM Lofts Limited has been helping local clients (5 mile radius) with their extension buildering jobs for many yea...
From £2,456
M Collins Builders Ltd
Michael Collins Builders are experts in domestic conversions and extensions - drawing on over 25 years experience in the trade. We have built up a ...
From £2,240
Maddison & Sons
Maddison & sons pride ourselves on attention to detail at the highest level.With an extensive background As Mains Contractors in construction fabri...
From £2,336
Brothers Group
Our building services company Brothers Group have been helping customers in North, East and West London and the surrounding area by providing profe...
RSJ cost in N19
How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in N19 it ranges from £2,176 (SLS BUILDERS LIMITED based in NW5) to £2,544 (BM Lofts Limited based in N4).
Comparing extension builders estimates for fitting an RSJ gives you an idea of who will be better value but the best way to compare costs is to get actual quotes.
Get rates and quotes to install an RSJ in N19 by posting a job with HaMuch and we will send it to extension builders in N19.
"RSJ re-installation" - N16, job posted 04/10/25
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Estimates for common extension builder jobs in N19;
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 - £17,645
Two storey extension - £88,217
Build a timber frame extension - £26,145
Build a swimming pool - £81,145
Single storey extension - £57,896
Side return extension - £43,129
Install an RSJ - £2,345
Outbuilding - £10,145
Build a Mansard loft conversion - £52,145
Loft conversion - £35,108
Build a kitchen extension - £42,145
Hip to gable loft conversion - £42,145
Granny annexe - £87,145
Garden office - £10,145
Convert a Garage - £16,145
Garage - £18,645
Build a flat roof extension - £22,145
Build a dormer loft conversion - £42,145
Concrete foundations - £6,395
Convert a bungalow loft - £29,145
Convert a basement - £39,129