Quick answer: Looking for home builders near you in Croydon? Choose a contractor who offers a free site survey, a fixed-price itemised quote, proof of insurance and a written workmanship guarantee. They should also handle building control and Party Wall matters. GSMS Construction Ltd builds new-build houses, house extensions, loft conversions, basements, renovations, driveways and concrete work across Croydon and South London. Every job comes with a fixed-price contract and a 5-year workmanship guarantee.
Key Takeaways
- Get at least three written quotes, and compare them line by line, not just on the total.
- Many single-storey rear extensions and loft conversions fall under permitted development, but they still need Building Regulations approval.
- If you share a wall with a neighbour, you’ll probably need to serve a Party Wall notice before work starts.
- In London and the South East, extensions usually cost 25–35% more than the UK average.
- A written contract with stage payments tied to finished work protects you from surprise costs.
What Do Home Builders in Croydon Actually Do?
Good home builders in Croydon take a project from your first idea to a signed-off, liveable space. A reliable team usually covers:
- Survey and advice: checking the site, ground conditions, access, drainage and the existing structure.
- Design coordination: working with architects and structural engineers on drawings and calculations.
- Approvals: planning or permitted development checks, Building Regulations applications and Party Wall notices.
- The build: groundworks, foundations, concrete, brickwork, steelwork, roofing, first and second fix, and finishes.
- Handover: building control completion certificate, snagging and your guarantee paperwork.
When one builder manages all of this, there are fewer handovers between trades. You get clear responsibility and a single point of contact.
New-Build Homes in Croydon
We don’t just extend and convert existing houses. GSMS Construction Ltd also builds new homes in Croydon, from the ground up.
A new-build house is a bigger job than an extension, and the early stages matter most. Here’s what’s usually involved:
- Plot and planning: a new dwelling always needs full planning permission from Croydon Council. Permitted development doesn’t apply.
- Design and engineering: architect’s drawings, structural calculations, drainage design and Building Regulations approval.
- Groundworks and foundations: site clearance, excavation, drainage and foundations sized for the ground conditions. Croydon’s clay soils and nearby trees often call for deeper foundations.
- Structure: the frame, walls and roof. Where a design calls for reinforced concrete, we can build the RC frame ourselves.
- Fit-out and handover: services, finishes, building control completion and your guarantee paperwork.
Our in-house team carries out the groundworks, foundations, concrete and RC frame and formwork, using our own plant. That keeps the structural stages of your new home under one contractor.
Services Our Home Builders Offer in Croydon
| Service | Best for | What’s included |
|---|---|---|
| House extensions | More kitchen, dining or living space | Single-storey, side-return, wrap-around and two-storey extensions |
| Home renovation & loft conversions | Updating older homes or adding bedrooms | Structural alterations, refurbishments and loft conversions |
| Basements | Gaining space without losing the garden | Excavation, underpinning, waterproofing and fit-out |
| Concrete work | Foundations, slabs and structural bases | Formwork, reinforcement and pours |
| Driveways | Off-street parking and kerb appeal | Excavation, sub-base, drainage and surfacing |
| Landscaping | Finishing the outside after a build | Patios, hard landscaping and garden structures |
We also run our own plant with CPCS/NPORS-trained operators, including digger and dumper hire with a driver. That means groundworks don’t stall while we wait on outside hire firms.
Areas Our Home Builders Cover Around Croydon
Our teams work across Croydon and South London every week, from busy terraced streets in Thornton Heath to larger plots in Sanderstead and Chipstead. Areas we regularly cover include:
- Croydon and Central Croydon
- Addiscombe
- Thornton Heath
- Norbury
- South Croydon
- Shirley
- Selsdon
- Sanderstead
- Coulsdon
- Purley
- New Addington
- Chipstead
We cover the CR0, CR2, CR5, CR7 and CR8 postcodes.
Not sure if we cover your street? See our Croydon construction page or call us and we’ll confirm.
Do You Need Planning Permission in Croydon?
Not always. Many home improvements count as permitted development (PD), so they don’t need a full planning application. Here are the common rules of thumb for houses (flats and maisonettes don’t have PD rights):
- Single-storey rear extensions: up to 3m deep on a semi-detached or terraced house, or 4m on a detached house. Under the prior approval scheme this can go up to 6m and 8m.
- Loft conversions: up to 40m³ of extra roof space on terraced houses and 50m³ on semi-detached and detached houses, with no extension beyond the front roof slope.
- Exceptions: PD rights can be limited in conservation areas, on listed buildings, or where the council has removed them under an Article 4 direction.
Always check your address with Croydon Council planning and the government’s Planning Portal before you commit. A Lawful Development Certificate gives you written proof that your project is PD, which helps when you sell.
Building Regulations and Party Wall Notices
Even when you don’t need planning permission, structural work must meet Building Regulations: structure, fire safety, insulation, ventilation and drainage. When the work’s signed off, you’ll get a completion certificate. Keep it safe.
If your work affects a shared wall, or involves digging near a neighbour’s foundations, the Party Wall etc. Act 1996 usually applies. Notices normally need to go out two months before work on a party wall, or one month before excavation. Leaving this late is one of the most common causes of delays on Croydon’s terraced and semi-detached streets.
How Much Do Home Builders in Croydon Cost?
Every project is different, but a few things drive most of the price:
- Size and complexity: cost per m² falls as projects get bigger, but steelwork, glazing and roof type push it up.
- Ground conditions: clay soils, tree roots and drains near the build can mean deeper or specialist foundations.
- Access: mid-terrace homes with no side access need more labour for muck-away and deliveries.
- Specification: kitchens, bi-fold or sliding doors, rooflights and underfloor heating vary hugely in price.
- Professional fees: architect, structural engineer, building control and party wall surveyor fees.
As a national benchmark, Homebuilding & Renovating (updated February 2026) puts single-storey extensions at around £2,200–£3,300 per m² excluding VAT. It notes that London and the South East typically carry a 25–35% premium. Treat figures like these as a starting point. Only a site survey will give you an accurate number.
At GSMS Construction Ltd, we survey your Croydon property for free. You then get an itemised, fixed-price quote, agreed in writing before any work starts.
How Long Do Home Builders in Croydon Take?
Here are typical on-site build times once approvals are in place:
- Single-storey rear extension: around 8–14 weeks
- Loft conversion: around 6–10 weeks
- Two-storey extension: around 12–20 weeks
- Basement: often 4–8 months, depending on excavation and waterproofing
Before the build, allow time for design, structural calculations, approvals and Party Wall agreements. That can add anything from a few weeks to several months. Planning applications alone are normally decided within 8 weeks.
How to Choose the Right Home Builder Near You in Croydon
Use this checklist before you sign anything:
- Check the company is real: look up the registered company and VAT number, and visit a recent or current job if you can.
- Ask for insurance documents: public liability and employer’s liability, with dates and cover levels.
- Get a written, itemised quote: labour, materials, prime-cost sums, exclusions and contingency should all be listed.
- Agree a payment schedule: pay in stages linked to completed work, never a large sum upfront.
- Get the guarantee in writing: how long it lasts and what it covers.
- Read independent reviews: on Google and trade review sites, looking for detail rather than just star ratings.
- Agree who handles approvals: building control, Party Wall notices and the completion certificate.
Croydon Projects We Take On
These are the jobs Croydon homeowners most often call us about, with typical on-site times once approvals are in place.
Rear and side-return extensions
Single-storey extensions on 1930s semis and Victorian terraces across Thornton Heath, Norbury and South Croydon. Usually around 8–14 weeks on site.
Loft conversions
Dormer and hip-to-gable lofts that add a bedroom and bathroom, common in Addiscombe, Shirley and Selsdon. Usually around 6–10 weeks on site.
New-build homes
New houses on cleared or infill plots, from groundworks and foundations through to the frame and handover. Timescales depend on the plot and the design.
See our work before you decide
When you call, ask us for photos of recent jobs similar to yours. It’s also worth reading our Google reviews before you choose any builder. Any good builder should be happy to show you their work.
Why Choose GSMS as Your Home Builders in Croydon
- Fixed-price contracts: every cost is itemised and agreed before work begins.
- 5-year workmanship guarantee on our building work.
- Fully licensed and insured, with documents available on request.
- Free site survey before we price anything.
- In-house plant and trained operators: CPCS/NPORS-trained teams for groundworks, digging and concrete.
- New builds as well as extensions: we build new homes, not just add to existing ones.
- Residential and commercial experience, including RC frame and formwork, plus commercial projects across London and beyond.
Our Process: From First Call to Handover
- Call or enquire: tell us about your home and what you want to achieve.
- Site visit: we inspect the property and talk through the options.
- Written quote: an itemised price with a clear schedule.
- Approvals: we coordinate drawings, building control and Party Wall requirements with your consultants.
- Build: a managed site with regular updates.
- Handover: snagging, completion sign-off and your guarantee paperwork.
Frequently Asked Questions
How do I find reliable home builders near me in Croydon?
Shortlist builders who’ll survey your property, give you an itemised written quote, show proof of insurance and put their guarantee in writing. Then read their reviews, ask to see previous work, and check they’ll handle building control and Party Wall notices.
Do I need planning permission for an extension in Croydon?
Many single-storey rear extensions and loft conversions on houses fall under permitted development, so they don’t need full planning permission. Conservation areas, listed buildings, flats and Article 4 areas are exceptions. Check with Croydon Council or apply for a Lawful Development Certificate.
How much does a house extension cost in Croydon?
National guides put single-storey extensions at around £2,200–£3,300 per m² excluding VAT, with London typically 25–35% higher. Your actual cost depends on size, ground conditions, access and finishes, so you’ll need a site survey for an accurate price.
How long does a loft conversion take?
Most loft conversions take around 6–10 weeks on site, once drawings and Building Regulations approval are in place.
Do you build new homes in Croydon?
Yes. GSMS Construction Ltd builds new-build houses as well as extensions, loft conversions and basements. Our in-house team handles the groundworks, foundations, concrete and RC frame, so the structural stages stay under one contractor.
Do you offer a guarantee on your work?
Yes. GSMS Construction Ltd gives a 5-year guarantee on workmanship and works to fixed-price contracts agreed before the project starts. Every quote follows a free site survey.
Which areas near Croydon do you cover?
We work across Croydon and Central Croydon, Addiscombe, Thornton Heath, Norbury, South Croydon, Shirley, Selsdon, Sanderstead, Coulsdon, Purley, New Addington and Chipstead, covering CR0, CR2, CR5, CR7 and CR8 postcodes.
Get a Free Site Survey from Home Builders Near You in Croydon
Planning a new home, extension, loft conversion, basement or renovation? Looking for home builders near you in Croydon? Talk to GSMS Construction Ltd for an honest assessment and a fixed-price quote.
Call: 07717 790273 or 07453 292996
Email: info@gsmsconstructionltd.co.uk
Hours: Monday to Saturday, 9am–5pm
Registered office: 5th Floor, 532 Southgate, London N14 6BN
Written by the GSMS Construction Ltd team. Last reviewed: October 2026. Planning and cost information is general guidance. Always confirm requirements with Croydon Council and your own consultants.