House Extensions in High Wycombe | High Wycombe Decorators
High Wycombe Decorators work alongside local building trades we’ve worked alongside for years to deliver complete extension projects across High Wycombe, Castlefield, Daws Hill, Hazlemere, and the surrounding Chiltern district.
What we cover:
- Decoration scope on new extensions: board primer, sealing coat, breathable masonry externally
- Contractor-partner coordination across roofing, brickwork, plastering, plumbing, and joinery
- Full one-stop-shop referral for projects spanning multiple building trades
- Sequencing decoration after first and second fix on new builds and extension programmes
High Wycombe Decorators are the decoration partner on extension projects across the Wycombe catchment. We cover the painting and finishing scope; the local building trades we work alongside cover the structural build.
Call 01494 326400 for a free quote.
Why Choose High Wycombe Decorators
Contractor-Coordinated
We work within an established building services network so one conversation connects you to a complete project team.
Clear Pricing
Fixed price from the first quote on the decoration scope. The build cost is the contractor’s separate quote.
Fully Insured
Full public liability cover on every extension decoration programme.
Highly Recommended
Most of our work comes from repeat clients and referrals across HP10–HP16.
House Extension Services
Contractor-Partner Model
We work alongside local building trades we’ve worked alongside for years to provide a complete service for residential extension projects. From roofing and brickwork to plastering, joinery, and electrics, we connect clients with the right team for each trade.
The decoration scope throughout is ours. Everything structural is handled by our contractor partners, whose quotes are entirely separate from ours.
Decoration on a New Extension
The decoration scope on a new single-storey rear extension covers three distinct phases: external render or masonry cure, internal plasterboard sealing, and the junction between the old fabric and the new extension. Side and rear extensions on 1930s semis in Castlefield and Daws Hill are typically finished in modern sand-and-cement render that must cure for a minimum of four weeks before masonry paint is applied.
For the full home renovation context of an extension programme, see our home renovation page.
Mist Coat and First Coat on Fresh Plaster
New internal plasterboard and fresh skim both require a sealing coat before any finish coat. Without this, the finish coat soaks unevenly, leaving patches with different sheen levels visible in raking light.
Where the extension connects to a kitchen space, the decoration scope overlaps with a kitchen renovation programme. See our kitchen renovation page for the full kitchen-extension scope.
One-Stop-Shop for Extension Trades
Managing multiple contractors on an extension project is the single most common source of delays and disputes on residential building projects. Working through our contractor network means the trades programme is coordinated from the outset.
The build cost is the contractor’s quote, not ours. The decoration cost is a fixed price from us, issued separately. For a full combined interior and exterior programme once the extension is complete, see our house painting page.
Exterior Decoration on the Extension
External render on a new extension must be decorated in a masonry system compatible with the cure state and the original exterior fabric. Where the extension render joins the original masonry or pebbledash of the main house, the systems must be compatible to avoid visible variation at the junction.
Breathable masonry paint is standard on sand-and-cement render. The full exterior masonry specification lives on our masonry painting page.
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Here’s How It Works
1. Initial consultation
You describe the project scope: extension size, trade requirements, and where decoration fits in your plans. We advise on the decoration schedule and, where you need additional trades, connect you with the right contractor partner for an independent quote.
2. Site visit and decoration scoping
We visit the property once structural work is underway or complete, assess every surface, and produce a fixed-price decoration quote. We note the cure state of any fresh render or plaster and confirm the earliest start date for each phase.
3. Trades programme coordination
We confirm the decoration start date with you and the main contractor. First-fix painting phases, if required, are scheduled around the trades programme. Second-fix finish phases are scheduled once all other trades have cleared the space.
4. Surface preparation
Fresh plasterboard and skim get a sealing coat. External render is assessed for cure and primed before masonry topcoat. The junction between old fabric and new extension is primed separately where substrates differ.
5. Decoration and handover
Finish coats are applied ceiling-down in sequence. External phases are monitored against the Wycombe valley forecast. We inspect every surface and complete touch-ups before signing off.
House Extension Costs in High Wycombe
Prices below are estimates only. Every property is different. Call 01494 326400 for a precise quote.
The decoration cost on an extension project covers painting and finishing only. The build cost is entirely separate, quoted independently by the contractor — typically £30,000–80,000+ for a full single- or two-storey extension in the High Wycombe area.
The decoration scope on a new extension typically runs £5,500–11,000. What shapes the cost on a Wycombe project:
Extension footprint
A small single-storey rear extension on a Castlefield semi has less surface area than a two-storey side extension. The decoration price scales with the surface area to be covered, inside and out.
Substrate complexity
Fresh render externally plus plasterboard internally is the standard new-build scenario. Where the extension connects to original lime plaster or pebbledash, additional primer specification adds time.
Programme phasing
First-fix and second-fix phases require separate mobilisation. A single-visit post-completion decoration programme is quicker to price and deliver than a phased programme.
Typical decoration ranges:
Single-storey rear extension (Castlefield or Daws Hill semi), full exterior and interior decoration: £2,800 to £5,000.
Two-storey side extension (Hazlemere or Downley semi), exterior masonry and internal rooms across both floors: £5,500 to £11,000.
Rear kitchen-diner extension (any inner suburb semi), decoration with mixed substrate junction treatment: £1,800 to £3,200.
Call 01494 326400 for a no-obligation site visit and written quotation.
House Extension Areas We Serve in High Wycombe
We serve High Wycombe and the surrounding Chiltern district for extension decorating.
Our decorators cover High Wycombe town centre, Hazlemere, Downley, Tylers Green, Castlefield, Daws Hill, Sands, Booker, Cressex, and the wider HP10, HP12, HP13, HP14, HP15, and HP16 postcodes. Return to the High Wycombe Decorators homepage to explore all services.
House Extensions FAQs
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