North Cornwall · PL30
Design, planning and build for St Kew Highway extension
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. Every St Kew Highway project we take on begins with reading the local context — St Kew Highway is a commuter village in the PL30 area, with everyday family housing, edge-of-village plots and quick routes to its parent town, with a building stock that leans toward older cottages and modern estates.
St Kew Highway sits in North Cornwall — covering PL30 from Wadebridge, St Issey, Egloshayle outward.
- Rural / open-countryside policy area
- ✓ Plain-English feasibility before any drawings
- ✓ Free first site visit, no obligation
- ✓ Measured-survey accuracy from day one
- ✓ One studio — design, planning and build under one roof
Local proof — Most St Kew Highway extension clients we work with are second-time builders — they've seen the templated approach fail once already.
Get a free feasibility viewLocal context
Why St Kew Highway is its own job.
Cornwall Council's lens on St Kew Highway is consistent: applications here usually turn on neighbour amenity, parking, overlooking and whether new work fits the rhythm of existing streets. For extension specifically, 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's why we treat every St Kew Highway project as a PL30-area job first — not a generic Cornwall job with a postcode bolted on. The older cottages that dominate St Kew Highway (and continue out toward Egloshayle) set the tone for any extension scheme here.
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 Kew Highway.
01
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.
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 Kew Highway 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
Why St Kew Highway homeowners pick a local studio for extension.
Building stock
Across St Kew Highway (PL30) we work on post-war semis, bungalows, modern estates, older cottages, garden infill plots. Each stock type drives a different extension response — older cottages in particular needs careful detailing here.
Parish & policy
St Kew Highway sits in the parish of St Kew Highway, which matters for how parish-level consultation lands on a extension application.
Coverage
We cover PL30 from our studio, with regular extension jobs also running in Wadebridge, St Issey, Egloshayle. Most St Kew Highway site visits get booked within the same week.
How quickly can you visit a St Kew Highway site?
Usually within the same week. St Kew Highway (PL30) is on our regular North Cornwall run, alongside Wadebridge, St Issey, Egloshayle. First visits are free and you'll get an honest feasibility view inside seven days.
Request a free visitFAQs
St Kew Highway Extensions — local questions answered.
- 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. In St Kew Highway specifically, we'd start by checking the latest parish-level planning history before committing to a direction.
- 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.
- 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.
St Kew Highway is part of Wadebridge
St Kew Highway sits inside the Wadebridge catchment — we cover both as one extension territory.
See Extensions in Wadebridge →Other services in St Kew Highway
Nearby places we cover
To sum up, our extension approach in St Kew Highway is built entirely around local Cornwall context, ensuring the best possible outcome for your property.