Builders in Croydon, Purley & Coulsdon

Excel Construction is based in Croydon. We carry out house extensions, loft conversions, new builds and full refurbishments across Croydon, Purley, Coulsdon, Sanderstead, Selsdon and Kenley, managed by one main contractor from design stage to handover.

Building work we do in Croydon, Sanderstead, Selsdon, Purley, Coulsdon and Kenley

• House extensions: rear, side and wraparound extensions, including garage conversions.
• Loft conversions: rear dormer, hip-to-gable and L-shaped lofts.
• New builds and knock-down rebuilds on larger plots.
• Roofing, including zinc and aluminium roofs for extensions and dormers.
• Full refurbishments: kitchens, bathrooms, rewiring and heating.

Building on local homes

Housing across this part of South London varies a lot. Nearer central Croydon you find Victorian villas and Edwardian terraces. Further out, in Sanderstead, Selsdon and Purley, there are many 1930s semi-detached houses, often with long gardens and, in some cases, garages that can be absorbed into a larger kitchen or family room. Further south, Coulsdon and Kenley have a mix of interwar homes and larger detached properties, some on the edge of the Green Belt. The 1930s semis suit hip-to-gable loft conversions and wraparound extensions, while the older terraces are better suited to rear dormers and side return extensions.

Area notes: what we see in each town

Croydon

Central Croydon and the roads around it have Victorian and Edwardian terraces and villas, plus many flats. Houses suit rear and side return extensions and rear dormers. Flats need a different route, because permitted development rights do not apply in the same way.

Sanderstead and Selsdon

Mostly 1930s and later family homes on larger plots, often with garages and long gardens. These are good candidates for side and rear extensions, garage conversions and hip-to-gable lofts.

Purley

A mix of Edwardian and interwar houses, including some larger detached homes. Many families here extend or add a loft rather than move.

Coulsdon and Kenley

Interwar and later housing, with bigger detached homes in places. Some roads sit close to the Green Belt, where limits on enlarging a property can apply.

Planning and permitted development

Planning is dealt with by the London Borough of Croydon. Many homes can be extended or converted under permitted development, but Croydon has 21 conservation areas, some with additional controls, and flats and maisonettes do not have the same permitted development rights as houses. We check the position for your address first and handle drawings, building control and any party wall notices.

For more detail, read our guide to loft conversion planning permission in London and Surrey.

How a project works with us

1. Free site visit. We look at the house, listen to what you want and talk through options.
2. Design and approvals. Drawings, structural design, planning where needed, building control and party wall notices.
3. Fixed written quote. A clear price, with a named project manager.
4. Build. Our own team carries out the work, managed by one main contractor.
5. Handover. A final check with you before you move back in.

What does it cost?

Every project is priced after a site visit, but our guides explain typical 2026 costs. See the house extension cost guide, the new build cost guide, the flat roof cost guide, the loft conversion cost guide and the kitchen extension cost guide. You can also read about our extensions, loft conversions and new builds.

Why homeowners choose Excel Construction

• One main contractor, so there is no chasing separate trades.
• Around 20 years of experience and a team of around 24 operatives.
• Clear written quotations and a named project manager.
• Party wall notices, drawings and building control handled for you.

Questions homeowners ask

Are you based in Croydon?

Yes. Excel Construction is a Croydon-based builder, so we are close to projects in Croydon, Purley, Coulsdon, Sanderstead, Selsdon and Kenley.

Do I need planning permission for a loft conversion in Croydon?

Often not for a house, if the work falls within permitted development, but conservation areas, flats and changes to the front roof slope usually need permission. Check with Croydon Council or read our planning guide.

Get a free quote in Croydon

Planning work in Croydon, Sanderstead, Selsdon, Purley, Coulsdon and Kenley? Contact us for a free site visit and quote, or see all the areas we cover.

Nearby areas we cover: Sutton, Cheam and Wallington, Caterham and Oxted, Bromley and Beckenham, Dulwich and West Norwood.