Two-storey extensions in Dartford
Need more room in Dartford? Two-storey and first-floor extensions add bedrooms and living space without moving. Here's everything we offer locally.
Dartford at a glance
- Postcode districts
- DA1 and DA2
- Area
- Kent, England
- Price region
- South East England
- Nearest towns
- Bexley (2.8 miles), Erith (3 miles), Swanley (3.8 miles), Belvedere (4.1 miles)
- Distance to Maidstone
- about 18 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 Dartford (DA1 and DA2) and the places around it, including Bexley (2.8 miles), Erith (3.0 miles) and Swanley.
Extensions available in Dartford
Two-storey rear extensions
For homes in Dartford: typical guide from £61,500.
Learn more
Two-storey side extensions
From £94,500 in Dartford. Free visit to firm it up.
Learn more
Two-storey wraparound extensions
Design, approvals and build for Dartford homes. Guide from £132,500.
Learn more
Part single, part two-storey extensions
Design, approvals and build for Dartford homes. Guide from £79,000.
Learn more
Extensions over a garage
From £34,500 in Dartford. Free visit to firm it up.
Learn more
First-floor extensions
Dartford guide price from £27,500, Standard spec.
Learn more
Two-storey extensions for semi-detached houses
Dartford guide price from £61,500, Standard spec.
Learn more
Two-storey extensions for detached houses
Design, approvals and build for Dartford homes. Guide from £94,500.
Learn more
Kitchen extensions with bedrooms above
Guide from £61,500 (before kitchen units) in Dartford, including VAT.
Learn more
Extra bedroom and en-suite extensions
Guide from £61,500 (plus en-suite) in Dartford, including VAT.
Learn moreWhich type suits your house?
Start with what you need the space for. Bedrooms and an en-suite upstairs with a bigger kitchen below is the classic two-storey brief, but in Dartford we also design annexes, home offices and bedrooms over garages.
Also available in Kent
- 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 Dartford
Dartford 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 Dartford
Do you cover Dartford?
Yes. We cover Dartford (DA1 and DA2) and the surrounding area, including Bexley and Erith. The first site visit is free.
What does a two-storey extension cost in Dartford?
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 Dartford do you cover?
Everywhere around it, including Bexley (2.8 miles), Erith (3 miles) and Swanley (3.8 miles), and the rest of Kent.