GSMS Construction Ltd – Your Trusted House Extensions in Croydon Specialists
Searching for reliable house extensions in Croydon builders? GSMS Construction Ltd delivers high-quality extensions that add living space, improve layout and boost property value across Croydon, Purley, Shirley, Coulsdon, Bromley and Sutton.
We specialise in single storey rear extensions, side return extensions, wrap-around extensions, double storey extensions and modern kitchen extensions — managing the full project from design to completion.
Call +44 7717 790 273 now for your free, no-obligation site visit and personalised 2026 quote.
Why Choose GSMS Construction Ltd for House Extensions in Croydon
- Local team with deep knowledge of Croydon homes (Victorian terraces, semis and more)
- Fully qualified builders focused on compliant, energy-efficient results
- Transparent pricing — no hidden fees or surprises
- Complete end-to-end service with regular updates and minimal disruption
- Proven local track record helping families create the space they need
Popular House Extension Types We Build in Croydon
- Single Storey Rear Extension — Creates bright open-plan kitchen-diners with bi-fold doors and roof lanterns
- Side Return Extension — Adds width and natural light to narrow Victorian terraces (very popular in Croydon)
- Wrap-Around Extension — Combines side and rear for maximum usable space
- Double Storey Extension — Adds extra bedrooms or bathrooms upstairs
- Kitchen Extensions — Bespoke, light-filled designs tailored to modern family living
Many clients combine house extensions with loft conversions or full refurbishments for greater value.
House Extensions Croydon Cost Guide 2026
In 2026, house extensions in Croydon typically cost £2,200 – £4,500+ per m² depending on size, specification and site conditions. Here’s a realistic breakdown for good-quality builds:
| Extension Type | Typical Size | Estimated Total Cost (2026) | Approx. Cost per m² |
|---|---|---|---|
| Single Storey Rear / Kitchen | 20–35 m² | £50,000 – £120,000 | £2,500 – £4,000 |
| Side Return Extension | 10–25 m² | £45,000 – £110,000 | £3,000 – £5,000 |
| Wrap-Around Extension | 25–50 m² | £75,000 – £170,000+ | £2,800 – £4,500 |
| Double Storey Extension | 40–70 m² | £100,000 – £230,000+ | £2,200 – £4,000 |
These figures cover main construction. Add 15-25% for VAT, architect fees, planning and contingencies. We provide clear, itemised quotes after a free site survey tailored to your Croydon property.
Planning Permission for House Extensions in Croydon
Many single-storey rear and side return extensions qualify as Permitted Development (PD) — meaning no full planning permission is needed if you stay within size and height limits (typically up to 3m rear projection for terraced/semi-detached homes).
Building Regulations approval is always required for structural safety and energy efficiency.
We support you with:
- Checking PD eligibility
- Croydon Council applications (when needed)
- Party Wall Agreements
- Lawful Development Certificates for peace of mind
Our local experience helps keep your project on track and fully compliant.
Our Simple House Extension Process
1. Free Site Survey & Consultation
We visit your Croydon home, listen to your vision and provide honest advice.
2. Design & Planning Support
We work with trusted architects and engineers for practical, compliant designs.
3. Clear Quote & Timeline
Receive transparent costs and realistic schedules (usually 3–6 months for single storey).
4. Professional Build
Skilled local trades keep the site tidy and communicate progress regularly.
5. Final Handover
Thorough snagging and ongoing support after completion.
Ready for Your House Extension in Croydon?
Extending your home is often smarter and more affordable than moving in 2026 — gain the exact space your family needs while adding long-term value.
Call GSMS Construction Ltd today on +44 7717 790 273 for your free quote. We usually reply the same day and can arrange a site visit within 48 hours.
Phone: +44 7717 790 273 Areas Covered: Croydon, Purley, Coulsdon, Shirley, Bromley & South London
Frequently Asked Questions (FAQs)
How much do house extensions cost in Croydon in 2026? Single storey extensions typically range from £50,000–£120,000. Side returns cost £45,000–£110,000 and double storey projects start from £100,000+. We provide accurate quotes after a free site visit.
Do I need planning permission for house extensions in Croydon? Not always. Many rear and side return extensions fall under Permitted Development. Larger or double storey works usually require full planning. We guide you through the entire process.
Are side return extensions popular in Croydon? Yes — especially on Victorian terraces. They add valuable width and light while often qualifying for Permitted Development.
How long does a house extension take in Croydon? Single storey projects usually take 3–6 months. Double storey or wrap-around extensions can take 6–9+ months depending on complexity.
Will house extensions increase my property value in Croydon? Yes. Well-designed extensions often recover 70-90% of the investment and make your home far more appealing to future buyers.
How do I get a free quote for house extensions in Croydon? Call +44 7717 790 273 or complete the contact form. We’ll arrange a convenient site visit with no obligation.