Two-storey extensions in Harold Wood
Homeowners in Harold Wood can use us for the whole project or just the drawings and approvals. Start with a free visit.
Harold Wood at a glance
- Postcode districts
- RM3
- Area
- Greater London, England
- Price region
- London
- Nearest towns
- Emerson Park (1.3 miles), Romford (2.4 miles), Hornchurch (2.7 miles), Upminster (2.8 miles)
- Approvals
- Two-storey rear: up to 3 m deep and 7 m from the rear boundary under permitted development. Side, wraparound and front: planning permission.
We cover Harold Wood (RM3) and the places around it, including Emerson Park (1.3 miles), Romford (2.4 miles) and Hornchurch.
Extensions available in Harold Wood
Two-storey rear extensions
Guide from £67,000 in Harold Wood, including VAT.
Learn more
Two-storey side extensions
Design, approvals and build for Harold Wood homes. Guide from £103,500.
Learn more
Two-storey wraparound extensions
Harold Wood guide price from £144,500, Standard spec.
Learn more
Part single, part two-storey extensions
For homes in Harold Wood: typical guide from £86,500.
Learn more
Extensions over a garage
Guide from £38,000 in Harold Wood, including VAT.
Learn more
First-floor extensions
For homes in Harold Wood: typical guide from £30,000.
Learn more
Two-storey extensions for semi-detached houses
For homes in Harold Wood: typical guide from £67,000.
Learn more
Two-storey extensions for detached houses
Guide from £103,500 in Harold Wood, including VAT.
Learn more
Kitchen extensions with bedrooms above
For homes in Harold Wood: typical guide from £67,000 (before kitchen units).
Learn more
Extra bedroom and en-suite extensions
For homes in Harold Wood: typical guide from £67,000 (plus en-suite).
Learn moreWhich type suits your house?
Which type suits your house in Harold Wood depends mostly on where you have room. A deep garden points to a rear extension; space beside the house points to a side or over-garage extension; a house that already has a single-storey extension can often take a first floor on top.
Also available in Greater London
- Two-storey front extensions
- Two-storey extensions for end-of-terrace houses
- Two-storey annexe extensions
- Garage conversions with a room above
- Two-storey extension plans and drawings
- Planning permission for two-storey extensions
- Structural engineering for two-storey extensions
- Building regulations for two-storey extensions
- Party wall notices for extensions
- Design and build two-storey extensions
Rules for Harold Wood
Harold Wood is in England. Two-storey rear: up to 3 m deep and 7 m from the rear boundary under permitted development. Side, wraparound and front: planning permission. Householder planning application: £548 (or £575 for applications made from 8 December 2026). Lawful development certificate: £274 (about £288 for applications from 8 December 2026). Councils should decide householder applications within 8 weeks of validation.
The full England rules explained
Questions about extensions in Harold Wood
Do you cover Harold Wood?
Yes. We cover Harold Wood (RM3) and the surrounding area, including Emerson Park and Romford. The first site visit is free.
What does a two-storey extension cost in Harold Wood?
Using our London guide, a two-storey rear extension with a 4 m × 3.5 m footprint on two floors (28 m² of new floor space) is about £67,000–£90,500 including VAT. An extension over a garage is about £38,000–£55,000.
Which other places near Harold Wood do you cover?
Everywhere around it, including Emerson Park (1.3 miles), Romford (2.4 miles) and Hornchurch (2.7 miles), and the rest of Greater London.