West Cornwall · TR27
House Extensions in Phillack
Extensions are the bread and butter of Cornish homes — adding the kitchen-diner the original layout never had, the bedroom for a growing family, or the light and views the back of the house should always have had. A Phillack brief starts on the street, not the screen — Phillack is a coastal village in the TR27 area, where sea exposure, views and seasonal pressure shape most building decisions, with a building stock that leans toward granite cottages and holiday homes.
Phillack sits in West Cornwall — covering TR27 from Hayle, Angarrack, Connor Downs outward.
- Conservation Area
- Cornwall AONB
- Cornish Mining World Heritage Site
- Coastal exposure zone
- ✓ Local to West Cornwall — not a national franchise
- ✓ Same team on paper as on site
- ✓ Fixed-fee planning packages, no surprise invoices
- ✓ Measured-survey accuracy from day one
Local watch-list
The TR27 constraints that shape a extension brief.
Watch #1
Conservation Area material and fenestration controls in central Phillack
Watch #2
AONB landscape-impact scrutiny on visible elevations
Watch #3
World Heritage Site assessment on changes visible in the mining landscape
Watch #4
Coastal exposure driving fixing, render and joinery spec
Who this is for
Phillack runs the full mix — owner-occupier, holiday-let, commercial and the occasional smallholding — so we scope every extension enquiry from the use-class up.
Local context
Why Phillack is its own job.
Coastal setting and landscape sensitivity mean rooflines, glazing, drainage and external materials need careful handling from the first sketch. For extension specifically, parts of Phillack sit within a designated Conservation Area, which means materials, fenestration and roof pitches all need to read sympathetically with the existing streetscape; the surrounding landscape falls inside the Cornwall Area of Outstanding Natural Beauty, so massing, height and landscape impact carry extra weight in any planning decision; the wider area forms part of the Cornish Mining World Heritage Site, which adds a heritage assessment layer to most material changes; coastal salt-laden air around Phillack drives detailing choices — fixings, render systems and timber treatments all need to be specified for exposure. So every Phillack job runs as a TR27-specific piece of work — local policy, local fabric, local builders. Most of our extension work in Phillack lands on granite cottages, with detailing that has to nod to the wider Angarrack streetscape.
Planning note
Most extensions in Cornwall are either permitted development or a straightforward householder application — but Conservation Area and AONB sites need a more careful design conversation upfront.
What we focus on
Extensions considerations specific to Phillack.
01
Drainage on older Cornish properties is rarely on a clean modern map; CCTV survey before design is often money well spent.
02
Permitted development for rear extensions runs to four metres on a detached house, three on a semi or terrace — but Article 4 areas remove this in some parishes.
03
Cornish granite and slate-hung walls react differently to new openings than modern brickwork — lintel choice and structural sequencing matter.
Our process
How a Phillack extension project runs.
Step 1
Brief
We meet on site, talk through how you live now and what's missing from the current layout.
Step 2
Design
Two or three sketch directions with rough budgets, then refinement of the chosen route.
Step 3
Approvals
Planning or Cert of Lawfulness, then a full building regs package.
Step 4
Build
Either through your own builder with our drawings, or as a full build by our team.
Step 5
Handover
Snag, certify, hand over the keys to your new space.
Typical single-storey rear extensions run twelve to twenty weeks on site; two-storey and wraparound projects sixteen to thirty weeks.
FAQs
Phillack Extensions — local questions answered.
- How much does an extension cost in Phillack?
- Build costs in Cornwall typically run from around £2,200 to £3,200 per square metre for a good-quality single-storey extension, more for kitchen-grade fit-out or complex glazing. We give a realistic budget before drawings start, not after. In Phillack specifically, we'd start by checking the Conservation Area boundary before committing to a direction.
- Can you handle the build as well as the design?
- Yes — that's the whole point of the studio. One contract, one point of contact, no finger-pointing between architect and builder when something needs a decision on site.
- What about the Party Wall Act?
- If you share a wall with a neighbour or build close to a boundary, the Act applies. We flag it early, recommend a surveyor and keep the programme aligned with the notice period.
- Do I need planning permission for an extension?
- Often no — single-storey rear extensions, side extensions and modest two-storey additions can sit inside permitted development on a typical detached house. Conservation Areas, AONB and Article 4 zones remove some of those rights, so we always check the address first.
- Will my house be liveable during the build?
- For most rear and side extensions, yes — we sequence the works so the kitchen and one bathroom stay functional until the new build is watertight and connected.
Phillack is part of Hayle
Phillack sits inside the Hayle catchment — we cover both as one extension territory.
See Extensions in Hayle →Local proof — Our West Cornwall workload means a Phillack extension project never has to wait for an out-of-county team to drive down.
Get a free feasibility viewOther services in Phillack
Nearby places we cover
For Phillack homeowners weighing up a extension, the right starting point is honest feasibility — that's what we lead with, before any drawings.