Build additional living space on your property in CM18

A granny annexe is the ideal solution for offering a young family member their own space in your home while they save up for their own house, or to help an older relative have some independence while keeping them at a safe distance. But how much do they cost to build in CM18?

Granny annexe cost in CM18 - Sort by rates or availability

From £86,880

Member since August 2025

Get quotes

Can design and Construction

Erald Kanani

Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...

From £87,192

(last active 07/10/26)

1 review

Get quotes

Torrington

Torrington Design

NIECEIC / NAAPIT GASSAFE WATER REGULATIONS We offer services towards completion of high end construction projects to dis...

"Did callout made safe my elctrical work thanks" - reviewed 16/05/23, REECYRUSSO

From £88,584

(last active 07/10/26)
Get quotes

Propello

Ali Alagoz

Propello is an established and experienced local extension builder in CM18. Please contact us for a free, no obligation quote and competitive rate...

From £87,560

(last active 07/10/26)
Get quotes

Rafix Building

Rafal Szczepanski

Our homes need to be regularly maintained and from time to time they need to be rejuvenated, modernised and enhanced. When it comes to building wor...

From £87,168

(last active 06/10/26)
Get quotes

Best Builders

Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...

From £87,432

(last active 06/10/26)
Get quotes

MM-Builders

Shelim Miah

Maintenance and repair 

Family run business from 2006

 

 

From £87,096

(last active 06/10/26)
Get quotes

KS Plastering SERVICE

Sampson Essien

Thistle Bonding Coat: Ideal for use on low-suction backgrounds such as brick or concrete blocks, this product provided a solid foundation, Thi...

From £89,320

(last active 05/10/26)
Get quotes

Reid and Co Developments Ltd

Jay Reid

We are a well established buildng firm who have been providing building services and managing of projects now for 25 years. We have all the necessary ...

From £87,392

(last active 04/10/26)
Get quotes

Samuele Paolini

Samuele Paolini

Need an Extension Builder in CM18? Samuele Paolini has been helping local clients (5 mile radius) with their extension buildering jobs for many ye...

From £87,024

(last active 02/10/26)
Get quotes

SH Enterprise

Need the extension buildering job done quickly without breaking the bank? SH Enterprise offer fast, reliable, and affordable extension buildering s...

Granny Annexe Cost in CM18

Estimates for granny annexe near CM18

Building a granny annexe ranges from £86,880 (Can design and Construction based in Ig11) to £89,320 (Reid and Co Developments Ltd based in NW8), 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 CM18 by posting a job with HaMuch. We will send it to extension builders in CM18 who will be happy to help you.


Get extension builder rates instantly

Get extension builder rates instantly (excluding VAT or callout charges)
Location in UKHourly RateDaily Rate
Granny Annexe near Harlow£43£288
Granny Annexe near Hoddesdon£46£296
Granny Annexe near Ware£47£296
Granny Annexe near Epping Forest£44£273
Granny Annexe near Loughton£44£273
Granny Annexe near Cheshunt£48£285
Granny Annexe near Bishop's Stortford£42£264
Granny Annexe near Hertford£46£289
Granny Annexe near East Hertfordshire£44£289
Granny Annexe near Romford£45£274

Estimates for common extension builder jobs in CM18;

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.

More extensions & conversions cost guides...