Two-storey extensions in Collier Row
We design, get approval for and build two-storey extensions in Collier Row and the surrounding area. Choose the type of extension below or book a free site visit.
Collier Row at a glance
- Postcode districts
- RM5
- Area
- Greater London, England
- Price region
- London
- Nearest towns
- Romford (1.8 miles), Chadwell Heath (2.4 miles), Harold Wood (2.9 miles), Emerson Park (3.3 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 Collier Row (RM5) and the places around it, including Romford (1.8 miles), Chadwell Heath (2.4 miles) and Harold Wood.
Extensions available in Collier Row
Two-storey rear extensions
Guide from £67,000 in Collier Row, including VAT.
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Two-storey side extensions
Collier Row guide price from £103,500, Standard spec.
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Two-storey wraparound extensions
From £144,500 in Collier Row. Free visit to firm it up.
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Part single, part two-storey extensions
Design, approvals and build for Collier Row homes. Guide from £86,500.
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Extensions over a garage
For homes in Collier Row: typical guide from £38,000.
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First-floor extensions
Guide from £30,000 in Collier Row, including VAT.
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Two-storey extensions for semi-detached houses
Design, approvals and build for Collier Row homes. Guide from £67,000.
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Two-storey extensions for detached houses
From £103,500 in Collier Row. Free visit to firm it up.
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Kitchen extensions with bedrooms above
Our London guide starts at £67,000 (before kitchen units) for this type.
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Extra bedroom and en-suite extensions
Guide from £67,000 (plus en-suite) in Collier Row, including VAT.
Learn moreWhich type suits your house?
Rear, side, wraparound or over the garage: each adds space in a different way. For most houses in Greater London, one or two of these will clearly suit the plot better than the rest, and we'll tell you which.
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 Collier Row
Collier Row 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 Collier Row
Do you cover Collier Row?
Yes. We cover Collier Row (RM5) and the surrounding area, including Romford and Chadwell Heath. The first site visit is free.
What does a two-storey extension cost in Collier Row?
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 Collier Row do you cover?
Everywhere around it, including Romford (1.8 miles), Chadwell Heath (2.4 miles) and Harold Wood (2.9 miles), and the rest of Greater London.