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Jon Howard Construction Ltd is a trusted extension builder serving customers in Hertford and the surrounding area. Contact us to today to get a com...
Relax... you have found a reliable extension builder in Hertford. Up and Out Builds Ltd is a friendly and reliable company based in Hertford who co...
Roberts & Co is a family run business est.2009. We specialize in Kitchen extensions and Loft conversions, and cover Hertfordshire, Essex and Greate...
Amarjeet Gill
Architecture and Construction all in one place.
FREE DRAWINGS for all projects we build.
Buyerz Trading is an established and experienced local extension builder in Hertford. Please contact us for a free, no obligation quote and competi...
Trusted and professional extension builder in Hertford. Experienced in all extension buildering work and keeping within budget and on quote. Advanc...
A1 Home Care Building Maintenance are here to help customers who need an Extension Builder in Hertford. We offer a competitive rate to complete all...
Need an Extension Builder in Hertford? MA Gower has been helping local clients (20 mile radius) with their extension buildering jobs for many years...
Ilir/leo Shkembi
Dear All, I’m a plumber and heating engineer, I have access to all other trades guys that are willing to work long hours and at the weekends ...
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 (Advance Construction Solutions based in EN6) to £88,560 (Flamstead Building Services Ltd based in EN8), 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 Hertford by posting a job with HaMuch. We will send it to extension builders in Hertford who will be happy to help you.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Granny Annexe near Hertford | £46 | £290 |
| Granny Annexe near Ware | £47 | £296 |
| Granny Annexe near Welwyn Garden City | £42 | £269 |
| Granny Annexe near Hoddesdon | £46 | £296 |
| Granny Annexe near East Hertfordshire | £44 | £289 |
| Granny Annexe near Hatfield | £42 | £266 |
| Granny Annexe near Cheshunt | £48 | £285 |
| Granny Annexe near Potters Bar | £43 | £273 |
| Granny Annexe near Stevenage | £44 | £282 |
| Granny Annexe near Harlow | £43 | £288 |
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 - £17,821

Two storey extension - £88,481

Build a timber frame extension - £26,321

Build a swimming pool - £81,321

Single storey extension - £61,416

Side return extension - £45,109

Install an RSJ - £2,521

Outbuilding - £10,321

Build a Mansard loft conversion - £52,321

Loft conversion - £36,758

Build a kitchen extension - £42,321

Hip to gable loft conversion - £42,321

Granny annexe - £87,321

Garden office - £10,321

Convert a Garage - £16,321

Garage - £18,821

Build a flat roof extension - £22,321

Build a dormer loft conversion - £42,321

Concrete foundations - £6,571

Convert a bungalow loft - £29,321

Convert a basement - £41,109