Two-storey extensions in Marlow
Need more room in Marlow? Two-storey and first-floor extensions add bedrooms and living space without moving. Here's everything we offer locally.
Marlow at a glance
- Postcode districts
- SL7 and SL8
- Area
- Buckinghamshire, England
- Price region
- South East England
- Nearest towns
- Maidenhead (4 miles), High Wycombe (4.3 miles), Burnham (5.2 miles), Henley-on-Thames (6 miles)
- Distance to Milton Keynes
- about 32.6 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.
Around Marlow we also work in Maidenhead, High Wycombe and Burnham, and across the rest of Buckinghamshire. Postcode districts in and near Marlow: SL7 and SL8.
Extensions available in Marlow
Two-storey rear extensions
Guide from £61,500 in Marlow, including VAT.
Learn more
Two-storey side extensions
Design, approvals and build for Marlow homes. Guide from £94,500.
Learn more
Two-storey wraparound extensions
Guide from £132,500 in Marlow, including VAT.
Learn more
Part single, part two-storey extensions
For homes in Marlow: typical guide from £79,000.
Learn more
Extensions over a garage
Our South East England guide starts at £34,500 for this type.
Learn more
First-floor extensions
Guide from £27,500 in Marlow, including VAT.
Learn more
Two-storey extensions for semi-detached houses
Guide from £61,500 in Marlow, including VAT.
Learn more
Two-storey extensions for detached houses
Guide from £94,500 in Marlow, including VAT.
Learn more
Kitchen extensions with bedrooms above
For homes in Marlow: typical guide from £61,500 (before kitchen units).
Learn more
Extra bedroom and en-suite extensions
Our South East England guide starts at £61,500 (plus en-suite) for this type.
Learn moreWhich type suits your house?
If you're not sure which type fits, that's what the free visit is for. We'll sketch the realistic options for your house in Marlow, with a rough idea of the approval route and cost for each.
Also available in Buckinghamshire
- 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 Marlow
Marlow 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 Marlow
Do you cover Marlow?
Yes. We cover Marlow (SL7 and SL8) and the surrounding area, including Maidenhead and High Wycombe. The first site visit is free.
What does a two-storey extension cost in Marlow?
Using our South East England 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 £61,500–£83,000 including VAT. An extension over a garage is about £34,500–£50,500.
Which other places near Marlow do you cover?
Everywhere around it, including Maidenhead (4 miles), High Wycombe (4.3 miles) and Burnham (5.2 miles), and the rest of Buckinghamshire.