From £87,488
Letchworth, SG6
Need an Extension Builder in Letchworth? M SPINDLER CONSTRUCTION LTD has been helping local clients (20 mile radius) with their extension builderin...
From £87,168
Need an Extension Builder in Letchworth? Gilbert & Gregson Construction Ltd has been helping local clients (20 mile radius) with their extension bu...
From £87,128
Draincall Services Ltd is a trusted extension builder serving customers in Letchworth and the surrounding area. Contact us to today to get a compet...
From £87,208
Letchworth, SG6
Need an Extension Builder in Letchworth? WILLMOTT DIXON CONSTRUCTION LI has been helping local clients (20 mile radius) with their extension builde...
From £87,288
Realise Your Luxury Dream Home With The Design And Build Partner You Can Trust.At MG Design & Build we have over 25 years of experience in the cons...
From £87,312
Experienced extension builder ready to quote for your work. Bricklayers is the best extension builder in Letchworth. No obligation free quotes and ...
From £87,408
M P BUILDING LIMITED is an established and experienced local extension builder in Letchworth. Please contact us for a free, no obligation quote and...
From £87,120
For more than 10 years, North Hertfordshire Construction LTD have been the name you can trust when it comes to building and development! We are kno...
From £87,384
Experienced extension builder ready to quote for your work. HB Construction is the best extension builder in Letchworth. No obligation free quotes ...
From £87,320
Totalworth Building Services is an established extension buildering business in Letchworth. We come highly recommended and provide competitive quot...

Building a granny annexe ranges from £87,120 (North Hertfordshire Construction Ltd based in SG5) to £87,488 (M SPINDLER CONSTRUCTION LTD based in SG6), 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 Letchworth by posting a job with HaMuch. We will send it to extension builders in Letchworth who will be happy to help you.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Granny Annexe near Letchworth | £44 | £283 |
| Granny Annexe near North Hertfordshire | £44 | £283 |
| Granny Annexe near Hitchin | £43 | £283 |
| Granny Annexe near Stevenage | £44 | £282 |
| Granny Annexe near Biggleswade | £41 | £268 |
| Granny Annexe near East Hertfordshire | £44 | £289 |
| Granny Annexe near Mid Bedfordshire | £42 | £276 |
| Granny Annexe near Luton | £41 | £278 |
| Granny Annexe near Ampthill | £38 | £258 |
| Granny Annexe near Harpenden | £86 | £315 |
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 - £17,782

Two storey extension - £88,424

Build a timber frame extension - £26,282

Build a swimming pool - £81,282

Single storey extension - £60,648

Side return extension - £44,677

Install an RSJ - £2,482

Outbuilding - £10,282

Build a Mansard loft conversion - £52,282

Loft conversion - £36,398

Build a kitchen extension - £42,282

Hip to gable loft conversion - £42,282

Granny annexe - £87,282

Garden office - £10,282

Convert a Garage - £16,282

Garage - £18,782

Build a flat roof extension - £22,282

Build a dormer loft conversion - £42,282

Concrete foundations - £6,532

Convert a bungalow loft - £29,282

Convert a basement - £40,677