House Extensions in Ascot

Ascot Decorators delivers house extensions in Ascot end-to-end, coordinating trusted local contractors for structural work and managing every stage of the decoration from board primer to final finish.

Full project coordination with our established contractor network
Decoration sequencing timed to first-fix, second-fix and final completion
Internal finishing including board primer and sealing coats on fresh plaster
External render and masonry coatings with specialist junction treatment

We have completed extension decoration projects across North Ascot, Cheapside, Winkfield and Sunninghill. Most clients live in 1960s to 1990s detached homes where rear extensions are common.

Call 01344 964866 for a free quote.

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Why Choose Ascot Decorators

Junction Expertise

We bridge the high-risk zone where new brickwork meets original render with a flexible, breathable system.

Clear Pricing

Fixed price from the first quote on the decoration scope, with no unexpected additions.

Fully Insured

Full public liability cover on every project, internal and external.

Highly Recommended

Most of our work comes from repeat clients and referrals across the Ascot area.

House Extension Services

Ascot Decorators coordinates the entire build programme through a network of building trades we have worked alongside for years, then delivers every stage of the decoration on the new extension.

One-Stop-Shop Project Delivery

We coordinate the entire build programme through our network of trusted contractors. You receive a single project timeline covering structural work, first-fix trades, plastering, second-fix joinery and final decoration.

Our contractors handle foundations, brickwork, roofing, windows, electrics and plumbing. We manage the decoration sequence and you deal with one point of contact rather than juggling multiple tradespeople.

Decoration Sequencing on New Builds

Decoration on a new extension follows a strict sequence tied to the building programme. We apply board primer to new plasterboard after first-fix electrics and plumbing are complete, then return to apply sealing coats on fresh plaster before it fully cures.

Final paint systems go on after second-fix joinery, skirting and architraves are fitted. This sequencing prevents moisture trapping in new plaster and ensures paint adhesion lasts for years.

Junction Treatment Between New and Original Fabric

The join between a new extension and the original rear elevation is the highest-risk zone for decoration failure in Berkshire’s heathland climate. Seasonal movement opens a hairline crack at the junction line, and the wrong coating allows moisture in within two winters.

We specify a flexible, breathable bridging system that moves with the surfaces and allows moisture to escape. The breathable masonry coating matches the existing render texture and colour.

External Masonry Coating on New Extensions

New brickwork on an extension needs a breathable masonry coating to protect against Berkshire’s prevailing south-westerlies. We clean down the new brickwork, apply a stabilising primer and finish with two coats of mineral-based masonry paint. The system allows the brick to breathe while shedding rainwater. For standalone render and masonry work, see our masonry painting service.

Internal Finishing on New Extension Rooms

We apply acrylic board primer to raw plasterboard to seal the paper face, then a thinned sealing coat within two weeks of plastering to lock in residual moisture. Two full coats of water-based emulsion go on walls and ceilings, and woodwork receives oil-based primer, undercoat and two gloss coats. For broader updates across the whole house, see our house painting service.

House extension decoration in Ascot by Ascot Decorators

Extension exterior masonry coating in Ascot by Ascot Decorators

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Book your free house extension site visit with Ascot Decorators

01344 964866

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Here’s How It Works

1. Site Visit and Quotation

We visit the property to review the extension plans, measure the new spaces and inspect the junction between new and original fabric. You receive a fixed-price quote covering the full decoration scope.

2. First-Fix Stage

Once the extension is weathertight and first-fix trades are complete, we apply board primer to new plasterboard. This stage happens before plastering begins.

3. Sealing Coat After Plastering

We return within two weeks of the plasterer finishing to apply thinned sealing coats on fresh plaster. This prevents patchy absorption and ensures even coverage on the top coats.

4. Final Decoration After Second-Fix

Once second-fix joinery, skirting and architraves are fitted, we apply final paint systems to walls, ceilings and woodwork. External masonry coating happens after scaffolding is up and before it comes down.

5. Handover

We walk through the completed extension with you to confirm every surface meets the specification. You receive care instructions for the new finishes.

House Extension Decoration Costs in Ascot

The full build cost comes from the contractor’s quote, not ours. Our pricing covers only the decoration scope. Call 01344 964866 for a fixed-price quote.

A full decoration programme for a two-storey rear extension including internal painting, external masonry coat and window joinery typically costs GBP 12,000 to GBP 20,000 on a 1970s detached home in North Ascot. A single-storey kitchen extension with internal finishing only might cost GBP 5,000 to GBP 8,000.

Extension cost detail in Ascot by Ascot Decorators

Extension decoration team in Ascot by Ascot Decorators

Number of Decoration Stages

Board primer, sealing coat, undercoat and topcoat each represent a separate site visit tied to the build programme. More stages mean more labour cost.

Junction Treatment

Bridging the junction between new and original render requires specialist materials and careful surface preparation. This work is essential on extensions in Berkshire’s climate.

Scaffolding Time

External masonry coating must happen while scaffolding is in place. Coordinating with the contractor’s scaffolding window keeps costs down.

Trade Insight

Hairline cracks at the junction are common in the first two winters; our flexible bridging system absorbs that movement and is covered for repeat treatment.

Most clients combine extension decoration with a broader home renovation programme to refresh adjacent rooms at the same time. For extensions focused on kitchen spaces, see our kitchen renovation service.

Areas We Cover

House extension decorators across Ascot, SL5, and nearby SL4 areas.

Our extension decoration team covers Ascot, North Ascot, South Ascot, Cheapside, Winkfield, Sunninghill, Cranbourne, Lovel Hill, Ascot Heath, and Swinley Forest Edge. Return to the Ascot Decorators homepage to explore all services. Call 01344 964866 if you are unsure whether we cover your area.

House Extension FAQs

Do you work with specialist contractors to deliver full house extensions including decoration in North Ascot and Cheapside?

Yes. We work with building trades we have worked alongside for years, who handle structural work, roofing, electrics, plumbing and plastering. We coordinate the full build programme and manage the decoration sequence so you deal with one team throughout.

How long does decoration take on a new extension?

A single-storey rear extension typically requires three decoration visits spread over six to eight weeks. The first visit for board primer happens after first-fix trades, the second visit for sealing coats happens two weeks after plastering, and the final visit for top coats happens after second-fix joinery is complete. A two-storey extension extends the programme to ten to twelve weeks.

Can you match the existing render colour on the original house?

Yes. We bring colour swatches to the site visit and match the existing shade. If the original render has faded, we can refresh the entire rear elevation in the new colour so the extension and original house look uniform.

What happens if cracks appear at the junction between new and original walls?

Hairline cracks at the junction are common on new extensions due to seasonal movement in the two structures. Our flexible bridging coating system moves with the surfaces and prevents moisture ingress. If cracks appear in the first two years, we return to re-coat the junction under warranty.

Do you handle the external masonry work while scaffolding is up?

Yes. We coordinate external masonry coating to happen while scaffolding is in place for the build. This avoids the cost of re-scaffolding later and ensures the extension is fully finished when the contractor hands over.

Can you refresh other rooms while the extension work is happening?

Yes. Many clients use the extension project as an opportunity to refresh adjacent rooms, hallways and the front elevation. We schedule internal decoration in other rooms to happen between the extension stages so the work runs in parallel.

What is the sealing coat on fresh plaster?

A sealing coat is a thinned layer of emulsion applied to fresh plaster within two weeks of plastering. It locks in residual moisture and creates an even surface for the top coats. Without a sealing coat, the first full coat absorbs unevenly and creates patchy shading.

Do you apply primer to new woodwork?

Yes. All new skirting, architraves, window boards and doors receive an oil-based primer to seal the timber, followed by undercoat and two gloss coats. The full system protects the wood and provides a durable finish.

How much does external masonry coating cost on a new extension?

External masonry coating on a single-storey rear extension typically costs GBP 1,800 to GBP 3,500 depending on the wall area and the number of coats. A two-storey extension might cost GBP 4,000 to GBP 6,500. These prices include surface preparation, stabilising primer and two finishing coats.

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