Thinking about extending your home in Bexleyheath (DA6, DA7)? Located on the South East London and Kent border, Bexleyheath blends suburban calm with great transport links and local amenities like The Broadway Shopping Centre, Danson Park, and Red House (National Trust). With a mix of 1930s semis, Victorian terraces, and modern family homes, it’s an ideal area to extend rather than move. Whether you want a bright open-plan kitchen-diner, a double-storey rear extension for extra bedrooms, or a side return to bring in more light, a well-planned project can transform your space and increase your property’s value.
This guide is tailored for Bexleyheath homeowners — from Barnehurst and Upton to Crook Log and Danson Park — who want accurate 2025 pricing, local planning insights, and a reliable builder. It’s based on Buildaway’s real-world experience across South East London, delivering quality builds with transparent quotes and an 18-month labour warranty.
How Much Does a House Extension Cost in Bexleyheath (2025)?
Bexleyheath sits in a mid-London price band — competitive compared to inner London but higher than towns further out in Kent. Typical 2025 averages are:
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 choices.
These are fair mid-market Bexleyheath figures — achievable for quality builders who meet Building Control standards and provide full project management.
What Drives the Price Up or Down
- Size & footprint – larger extensions need more materials and labour.
- Structural steel (RSJs) – removing load-bearing walls adds £2k–£6k+.
- Ground & drainage – moving existing drains (common near Danson Park homes) can add cost.
- Roof & glazing – flat roofs with skylights are economical; bifold or Crittall-style doors can add £3k–£8k+.
- Kitchens & bathrooms – kitchens £10k–£25k+, bathrooms £6k–£15k+.
- Heating & plumbing – new Megaflo/unvented cylinder if adding bathrooms £2.5k–£4.5k.
- Finishes & joinery – flooring, decorating, and bespoke carpentry.
- Access & parking – tight parking around The Broadway or Upton Road may add logistical costs.
Planning Permission & Building Control in Bexleyheath
- Permitted Development (PD): Many single-storey rear and side return extensions qualify under PD if within size and height limits.
- Full planning permission: Required for double-storey, wrap-around, or front extensions.
- Conservation Areas: Bexleyheath has protected pockets near Danson Park and Red House where PD rights may be restricted.
- Building Control: Always required for structure, insulation, drainage, and electrics.
Buildaway works directly with Bexley Council and local approved inspectors to ensure compliance, smooth planning, and timely certification.
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 time for bespoke glazing, kitchens, or landscaping if needed.
Typical Full Project Budget Breakdown (30 m² Double-Storey)
| Element | Typical Cost |
|---|---|
| Core structure & shell | £70,000 – £85,000 |
| Windows / 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 |
(Bespoke or high-end finishes can exceed £150k.)
Why Bexleyheath Clients Choose Buildaway
- Local knowledge — experience with 1930s semis, Edwardian terraces, and newer homes across DA6/DA7.
- Transparent pricing — clear itemised quotes and staged payments.
- 18-month labour warranty — extended peace of mind.
- Fully insured & certified — Gas Safe, NICEIC, and liability cover.
- Project management you can rely on — from design through completion, with communication at every stage.
Frequently Asked Questions
Do I need planning permission for my Bexleyheath extension?
Often not for single-storey within PD, but double-storey, front, or conservation area homes will need it.
Can I live at home during the build?
Yes, particularly for single-storey projects. Expect some disruption but minimal downtime.
Will I need to upgrade my boiler or hot water system?
Likely if you’re adding bathrooms — a Megaflo or boiler upgrade is recommended.
What warranty do you offer?
Buildaway provides an 18-month labour warranty on all structural and fit-out work.
Next Steps for Bexleyheath Homeowners
If you’re ready to extend your Bexleyheath home:
- Arrange a free home visit to discuss your project and budget.
- Buildaway can handle design, planning, and structural drawings.
- You’ll receive a transparent, itemised quotation — no hidden extras.
📞 020 8108 0388 📧 info@buildaway.co.uk
Buildaway — trusted by Bexleyheath homeowners for quality extensions, kitchens, and full home transformations.