Lizard Peninsula · TR12
Extensions for St Keverne (TR12)
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. Working in St Keverne means starting from the TR12 context — St Keverne is the inland market village of the eastern Lizard, with a substantial fifteenth-century church, a wide village square and an AONB-protected agricultural hinterland, with a building stock that leans toward modern infill bungalows and Georgian and Victorian villas.
St Keverne sits in Lizard Peninsula — covering TR12 from Coverack outward.
- Conservation Area
- Cornwall AONB
- Rural / open-countryside policy area
- ✓ Local to Lizard Peninsula — not a national franchise
- ✓ Same team on paper as on site
- ✓ One studio — design, planning and build under one roof
- ✓ Measured-survey accuracy from day one
Local watch-list
St Keverne-specific issues we screen on the first visit.
Watch #1
Conservation Area material and fenestration controls in central St Keverne
Watch #2
AONB landscape-impact scrutiny on visible elevations
Watch #3
Tighter Local Plan tests on isolated rural dwellings
Who this is for
St Keverne 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 St Keverne is its own job.
In St Keverne the planning picture is specific: conservation Area covers the square and church; AONB across the parish. Active parish council with detailed input on village-edge proposals. For extension specifically, parts of St Keverne 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; 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. That local reading is what makes a St Keverne (TR12) project different from a generic Cornwall scheme — and is the whole reason we work this way. On modern infill bungalows in particular — the kind you'll also find toward Manaccan — the extension brief always has to read the existing fabric first.
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 St Keverne.
01
Cornish granite and slate-hung walls react differently to new openings than modern brickwork — lintel choice and structural sequencing matter.
02
Wind and sea-spray exposure can drive material choices on west-facing extensions; we detail accordingly.
03
Drainage on older Cornish properties is rarely on a clean modern map; CCTV survey before design is often money well spent.
04
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.
Our process
How a St Keverne 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
St Keverne Extensions — local questions answered.
- 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. In St Keverne 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.
- 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.
- 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.
St Keverne is the hub for these neighbourhoods
We run extensions across St Keverne and the surrounding TR12 neighbourhoods — same studio, same site team.
- Coverack
TR12
Local proof — Our Lizard Peninsula workload means a St Keverne extension project never has to wait for an out-of-county team to drive down.
Get a free feasibility viewOther services in St Keverne
If you're balancing ambition against TR12 planning realism, our St Keverne extension work threads that needle without the usual drama.