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J.T.Construction is a trusted extension builder serving customers in Runcorn and the surrounding area. Contact us to today to get a competitive quo...
Fixit Cheshire is an established and experienced local extension builder in Runcorn. Please contact us for a free, no obligation quote and competit...
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
Richie Crawley
Runcorn, WA7
Relax... you have found a reliable extension builder in Runcorn. R A C Gas is a friendly and reliable company based in Runcorn who consider no job ...
Get an Extension Builder in Runcorn who you can trust. National Plumbing and Heating provide friendly and reliable extension buildering services to...
Experienced extension builder ready to quote for your work. Elevate Finishing is the best extension builder in Runcorn. No obligation free quotes a...
From £86,784
Carl Tommons
Building from the Ground up through to fit out, new build, refurb, extension.
From £86,648
Trusted and professional extension builder in Runcorn. Experienced in all extension buildering work and keeping within budget and on quote. HPH Imp...
From £86,696
Welcome to Space Design & Build a building company based in Warrington.With nearly 40 years combined experience in the industry Space Design & Buil...
From £86,808
Relax... you have found a reliable extension builder in Runcorn. Webby is a friendly and reliable company based in Runcorn who consider no job as t...

Building a granny annexe ranges from £86,608 (R A C Gas based in WA7) to £86,992 (J.T.Construction based in WA5), 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 Runcorn by posting a job with HaMuch. We will send it to extension builders in Runcorn who will be happy to help you.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Granny Annexe near Runcorn | £33 | £228 |
| Granny Annexe near Halton | £31 | £220 |
| Granny Annexe near Widnes | £31 | £220 |
| Granny Annexe near Warrington | £31 | £222 |
| Granny Annexe near Huyton with Roby | £31 | £225 |
| Granny Annexe near Prescot | £31 | £223 |
| Granny Annexe near Knowsley | £31 | £222 |
| Granny Annexe near St Helens | £31 | £224 |
| Granny Annexe near Ellesmere Port | £31 | £214 |
| Granny Annexe near Newton-le-Willows | £31 | £221 |
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 - £17,286

Two storey extension - £87,678

Build a timber frame extension - £25,786

Build a swimming pool - £80,786

Single storey extension - £50,712

Side return extension - £39,088

Install an RSJ - £1,986

Outbuilding - £9,786

Build a Mansard loft conversion - £51,786

Loft conversion - £31,740

Build a kitchen extension - £41,786

Hip to gable loft conversion - £41,786

Granny annexe - £86,786

Garden office - £9,786

Convert a Garage - £15,786

Garage - £18,286

Build a flat roof extension - £21,786

Build a dormer loft conversion - £41,786

Concrete foundations - £6,036

Convert a bungalow loft - £28,786

Convert a basement - £35,088