Thinking about extending your home in Bexley (DA5)? Known for its leafy streets, village feel, and excellent schools, Bexley is one of South East London’s most desirable areas for families looking to expand without moving. From the charming conservation areas near Bexley Village and St. Mary’s Church to the suburban roads around Albany Park and Hurst Road, a well-designed home extension can transform your living space and significantly boost property value.
This guide is specifically for Bexley homeowners — whether you’re near Hurst Road, Bexley Village, or Joydens Wood — who want clear, 2025 price guidance, practical planning insight, and trusted local construction expertise. It’s built from Buildaway’s experience delivering extensions across the London Borough of Bexley, combining transparent quotes, detailed communication, and an 18-month labour warranty.
How Much Does a House Extension Cost in Bexley (2025)?
Bexley sits in a mid-range price bracket — competitive compared with inner London, yet offering strong value for quality builds. Expect the following realistic 2025 averages:
Single-Storey Rear Extension
- Build-only: £2,200 – £2,800 per m²
- Fully finished with kitchen: £2,800 – £3,500 per m²
- Example: 25 m² kitchen-diner = £55,000 – £70,000 build-only or £70,000 – £90,000 turnkey.
Double-Storey Rear Extension
- Build-only: £2,000 – £2,600 per m²
- Fully finished: £2,600 – £3,300 per m²
- Example: 40 m² over two floors = £80,000 – £110,000 build-only or £105,000 – £130,000 turnkey.
Side Return & Wrap-Around Extensions
Usually in line with single-storey rates: £2,200 – £2,900 per m², depending on design complexity and glazing.
These figures represent the current mid-market rates for Bexley builders offering compliant, high-quality work with Building Control certification.
What Drives the Price Up or Down
- Size & footprint – more space = higher cost in structure and finishes.
- Structural steel (RSJs) – removing load-bearing walls adds £2k–£6k+.
- Ground conditions & drainage – clay-heavy soil near Joydens Wood may increase foundation costs.
- Roof style & glazing – flat roofs with rooflights are affordable; large sliders/bifolds add £3k–£8k+.
- Kitchens & bathrooms – kitchens £10k–£25k+, bathrooms £6k–£15k+.
- Heating & plumbing – new Megaflo or boiler upgrades £2.5k–£4.5k.
- Finishes & joinery – flooring, decorating, and bespoke carpentry all impact cost.
- Access & logistics – narrow village lanes around Old Bexley can slightly increase build time or skip costs.
Planning Permission & Building Control in Bexley
- Permitted Development (PD): Most single-storey rear or side extensions fall under PD if within volume and height limits.
- Full Planning Permission: Needed for double-storey, wrap-around, or front-facing extensions.
- Conservation Areas: Parts of Old Bexley Village are conservation-protected, meaning tighter controls.
- Building Control: Always required for structural, insulation, drainage, and electrical compliance.
Buildaway works regularly with Bexley Council’s planning department and approved private inspectors to streamline approvals and ensure compliant, certified builds.
How Long Will It Take?
- Design & planning: 4–12 weeks
- Technical drawings & approvals: 2–6 weeks
- On-site build:
- Single-storey: 10–14 weeks
- Double-storey: 14–20 weeks
- Add extra time for bespoke glazing, kitchens, or landscaping if desired.
Typical Full Project Budget Breakdown (30 m² Double-Storey)
| Element | Typical Cost |
|---|---|
| Core structure & shell | £70,000 – £85,000 |
| Windows / doors / glazing | £5,000 – £10,000 |
| Kitchen supply & fit | £12,000 – £25,000 |
| Bathroom fit-out | £6,000 – £12,000 |
| Heating / boiler / Megaflo | £3,000 – £5,000 |
| Flooring & decorating | £5,000 – £15,000 |
| Professional fees & permissions | £3,000 – £8,000 |
| Total realistic range: | £100,000 – £135,000 |
(High-end bespoke finishes can reach £150k+.)
Why Bexley Clients Choose Buildaway
- Local experience — deep understanding of Bexley’s 1930s homes, conservation boundaries, and modern builds.
- Transparent quotes — no hidden extras; clear staged payments.
- 18-month labour warranty — longer than many mid-market builders.
- Fully insured & certified — Gas Safe, NICEIC, and full liability cover.
- Project management done right — Buildaway coordinates everything from design to completion.
Frequently Asked Questions
Do I need planning permission for my Bexley extension?
Not always — single-storey rears often qualify under PD, but larger or double-storey builds require full permission.
Can I live at home while building?
Yes, especially for single-storey extensions. Expect some temporary disruption.
Will I need to upgrade my boiler or water system?
If adding bathrooms or a large kitchen, an unvented Megaflo or new boiler is recommended.
What warranty do you provide?
Buildaway offers an 18-month labour warranty on all works for peace of mind.
Next Steps for Bexley Homeowners
If you’re planning an extension in or around Bexley Village or Albany Park:
- Book a free home consultation to explore your options.
- Buildaway can handle the full process — design, planning, and build.
- Receive a transparent, itemised quote with clear timelines.
📞 020 8108 0388 📧 info@buildaway.co.uk
Buildaway — trusted across Bexley for quality extensions, kitchens, and complete home transformations.