West Cornwall · TR13
Extensions Ashton: TR13 planning, West Cornwall fabric
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 TR13 site visit comes before a Ashton sketch, every time — Ashton is a small rural hamlet in the TR13 area, with scattered homes, lanes and a deliberately quiet settlement pattern, with a building stock that leans toward small infill homes and bungalows.
Ashton sits in West Cornwall — covering TR13 from Helston, Breage, Sithney outward.
- Rural / open-countryside policy area
- ✓ rural policy area experience built into the fee
- ✓ Free first site visit, no obligation
- ✓ Same team on paper as on site
- ✓ Fixed-fee planning packages, no surprise invoices
Who this is for
Ashton 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
What usually catches extension projects out in Ashton.
Watch #1
Tighter Local Plan tests on isolated rural dwellings
Local proof — Our West Cornwall workload means a Ashton extension project never has to wait for an out-of-county team to drive down.
Get a free feasibility viewFAQs
Ashton 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 Ashton 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.
- 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.
Local context
Why Ashton is its own job.
The main planning test is usually whether the proposal remains subordinate, locally detailed and acceptable on access, drainage and neighbour amenity. That sets the scene before any design work begins. 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. It's the kind of detail that decides whether a Ashton application gets approved at eight weeks or stalls in committee. The small infill homes that dominate Ashton (and continue out toward Sithney) 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 Ashton.
01
Cornish granite and slate-hung walls react differently to new openings than modern brickwork — lintel choice and structural sequencing matter.
02
Drainage on older Cornish properties is rarely on a clean modern map; CCTV survey before design is often money well spent.
03
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.
04
Wind and sea-spray exposure can drive material choices on west-facing extensions; we detail accordingly.
Our process
How a Ashton 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 TR13.
Building stock
Across Ashton (TR13) we work on cottages, farmhouses, converted barns, bungalows, small infill homes. Each stock type drives a different extension response — small infill homes in particular needs careful detailing here.
Parish & policy
Ashton sits in the parish of Ashton, which matters for how parish-level consultation lands on a extension application.
Coverage
We cover TR13 from our studio, with regular extension jobs also running in Helston, Breage, Sithney. Most Ashton site visits get booked within the same week.
How quickly can you visit a Ashton site?
Usually within the same week. Ashton (TR13) is on our regular West Cornwall run, alongside Helston, Breage, Sithney. First visits are free and you'll get an honest feasibility view inside seven days.
Request a free visitAshton is the hub for these neighbourhoods
We run extensions across Ashton and the surrounding TR13 neighbourhoods — same studio, same site team.
- Praa Sands
TR20
Other services in Ashton
Nearby places we cover
Local neighbourhoods in Ashton
Most Ashton extension enquiries start with one honest conversation about what's actually allowed — and that conversation costs nothing.