Croydon & South London Specialists · Free Quote Within 24 Hours · 5★ Google Reviews
ARZConstruction Ltd
House Extension Croydon
All ServicesCroydon & South London

House Extension Croydon

More space, more light, more value. Expert house extensions built to the highest standard in Croydon and across South London.

Free quote guaranteed within 24 hours

About This Service

Whether you need a generous kitchen-diner, an extra bedroom or a complete ground-floor transformation, ARZ Construction designs and builds house extensions that work with your home's existing character. We manage every trade — groundworks, brickwork, steels, roofing, glazing and finishes — under one contract with a single project manager accountable throughout.

What's Included

  • Rear, side-return and wrap-around extensions
  • Single and double-storey builds
  • Groundworks and structural steelwork
  • Brickwork matched to the original house
  • Bifold doors and flat roof rooflights
  • Full project management, start to finish
House Extension Croydon by ARZ Construction in Croydon
What our clients say
"ARZ Construction built our rear extension and the result is stunning. From the first visit right through to handover, the team were professional, tidy and kept us informed every step of the way. The finish is exactly what we asked for. Would not hesitate to recommend."
Rear House Extension

Sarah Mitchell

Croydon, South London · March 2025

"We had a dormer loft conversion done and the whole process was smooth. Very competitive price and the quality of the work is excellent. Our project manager was on site regularly and always available on the phone. The new bedroom and en-suite look brilliant."
Loft Conversion

James Okafor

Bromley, South London · January 2025

Frequently Asked Questions

Do I need planning permission for a house extension in Croydon?
Many single-storey rear extensions fall under permitted development and do not require a full planning application. Side extensions, two-storey extensions and builds in conservation areas typically do need permission. We advise you clearly at the first visit.
How much does a house extension cost in Croydon?
A single-storey rear extension in South London typically costs between £1,800 and £2,500 per m², depending on specification. A 25m² kitchen extension might range from £45,000 to £65,000 fully finished. We provide detailed, itemised quotes.
How long does a house extension take to build?
A single-storey extension typically takes 12–16 weeks on site. Two-storey extensions are usually 16–22 weeks. Your quotation includes an indicative programme from start to handover.
Can you match my existing brickwork?
Yes. We source bricks to match your existing house, including reclaimed stock where needed. Matching the original is important for both aesthetics and planning compliance, and we take it seriously.
What is a Party Wall Agreement and do I need one?
If your extension is within 3–6 metres of a neighbour's property or on the boundary, the Party Wall Act 1996 requires you to serve notice. We handle all Party Wall notices and can recommend a qualified surveyor where an agreement is needed.

Ready to Start Your House Extension Croydon?

Get a free, no-obligation quotation. We respond to every enquiry within 24 hours — guaranteed.

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