West Cornwall · TR20
Perranuthnoe extension — feasibility first, drawings second
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. In Perranuthnoe, that work is shaped by the place itself — Perranuthnoe is a small AONB cliff-top village between Marazion and Praa Sands, with a sandy cove, twelfth-century church and a tight, well-preserved Conservation Area at its centre, with a building stock that leans toward traditional granite farm cottages and modern AONB-sensitive replacements.
Perranuthnoe sits in West Cornwall — covering TR20 from Marazion, Goldsithney outward.
- Conservation Area
- Cornwall AONB
- Coastal exposure zone
- Rural / open-countryside policy area
- ✓ Cornwall Council regulars across every sub-area
- ✓ Free first site visit, no obligation
- ✓ Plain-English feasibility before any drawings
- ✓ 30+ years of Cornwall Council approvals
Who this is for
Perranuthnoe 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 watch-list
Perranuthnoe-specific issues we screen on the first visit.
Watch #1
Conservation Area material and fenestration controls in central Perranuthnoe
Watch #2
AONB landscape-impact scrutiny on visible elevations
Watch #3
Coastal exposure driving fixing, render and joinery spec
Watch #4
Tighter Local Plan tests on isolated rural dwellings
Local proof — Most Perranuthnoe homeowners come to us after a extension quote elsewhere felt vague on planning — we lead with feasibility instead.
Get a free feasibility viewFAQs
Perranuthnoe Extensions — local questions answered.
- 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. In Perranuthnoe specifically, we'd start by checking the Conservation Area boundary before committing to a direction.
- 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.
- How much does an extension cost in Cornwall?
- 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.
- 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.
- How long does the whole process take?
- Allow roughly three months for design and approvals, then twelve to twenty weeks on site for a typical single-storey extension. Wraparounds and two-storey add-ons take longer, mostly through approval and groundworks.
Local context
Why Perranuthnoe is its own job.
Locally, conservation Area covers the village core and church; AONB extends across the parish. Isolated dwelling policy applies in the open countryside between settlements. For extension specifically, parts of Perranuthnoe 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; coastal salt-laden air around Perranuthnoe drives detailing choices — fixings, render systems and timber treatments all need to be specified for exposure; Cornwall Council's Local Plan applies tighter tests to isolated rural dwellings here, so design rationale and policy fit need to be set out clearly from the outset. Which is why we scope Perranuthnoe projects parish-up, not template-down — the TR20 context shapes the design from day one. Whether the project is on traditional granite farm cottages in the centre or further out toward Praa Sands, the extension response is locally tuned.
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 Perranuthnoe.
01
Cornish granite and slate-hung walls react differently to new openings than modern brickwork — lintel choice and structural sequencing matter.
02
Extensions over a certain proportion of the original house trigger full Part L upgrade obligations to the existing building — worth knowing before brief is set.
03
Wind and sea-spray exposure can drive material choices on west-facing extensions; we detail accordingly.
04
Drainage on older Cornish properties is rarely on a clean modern map; CCTV survey before design is often money well spent.
Our process
How a Perranuthnoe 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.
Local fabric
Choosing a extension team that actually knows TR20.
Building stock
Across Perranuthnoe (TR20) we work on traditional granite farm cottages, Edwardian villas, 1960s coastal bungalows, modern AONB-sensitive replacements. Each stock type drives a different extension response — traditional granite farm cottages in particular needs careful detailing here.
Parish & policy
Perranuthnoe sits in the parish of Perranuthnoe, which matters for how parish-level consultation lands on a extension application.
Coverage
We cover TR20 from our studio, with regular extension jobs also running in Marazion, Goldsithney, Praa Sands. Most Perranuthnoe site visits get booked within the same week.
What does a first Perranuthnoe consultation cost?
Nothing. We come to the property, walk the site, talk through what works on a TR20 plot and follow up with a written feasibility note inside a week — no obligation either way.
Request a free visitPerranuthnoe is part of Marazion
Perranuthnoe sits inside the Marazion catchment — we cover both as one extension territory.
See Extensions in Marazion →Other services in Perranuthnoe
Nearby places we cover
The extension jobs we're proudest of in Perranuthnoe are the ones where the planning route was clear before a single elevation was drawn.