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Select your affordable WF9 extension builder
Harvie Construction is an established and experienced local extension builder in WF9. Please contact us for a free, no obligation quote and competi...
From £87,032
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...

Building a granny annexe ranges from £86,864 (Harvie Construction based in S72) to £87,032 (C&S BUILDERS based in WF7), but these are just estimates that can help give you an idea of who will be better value in your area.
The best thing to do is to get quotes to build a granny annexe in WF9 by posting a job with HaMuch. We will send it to extension builders in WF9 who will be happy to help you.
"Granny annexe space for mum with separate quarters" - S72, job posted 07/05/26
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Granny Annexe near Pontefract | £30 | £228 |
| Granny Annexe near Barnsley | £31 | £242 |
| Granny Annexe near Normanton | £30 | £233 |
| Granny Annexe near Castleford | £30 | £225 |
| Granny Annexe near Wakefield | £31 | £240 |
| Granny Annexe near Doncaster | £29 | £238 |
| Granny Annexe near Rothwell | £30 | £230 |
| Granny Annexe near Ossett | £33 | £245 |
| Granny Annexe near Rotherham | £32 | £257 |
| Granny Annexe near Wickersley | £32 | £258 |
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 - £17,448

Two storey extension - £87,922

Build a timber frame extension - £25,948

Build a swimming pool - £80,948

Single storey extension - £53,960

Side return extension - £40,915

Install an RSJ - £2,148

Outbuilding - £9,948

Build a Mansard loft conversion - £51,948

Loft conversion - £33,263

Build a kitchen extension - £41,948

Hip to gable loft conversion - £41,948

Granny annexe - £86,948

Garden office - £9,948

Convert a Garage - £15,948

Garage - £18,448

Build a flat roof extension - £21,948

Build a dormer loft conversion - £41,948

Concrete foundations - £6,198

Convert a bungalow loft - £28,948

Convert a basement - £36,915