Mid Cornwall · PL26
One studio for extension in Polgooth
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. The way we approach extension in Polgooth starts with a measured walk-round — Polgooth is a former mining settlement in the PL26 area, with granite terraces, chapel buildings and industrial landscape character still visible, with a building stock that leans toward granite terraces and workers cottages.
Polgooth sits in Mid Cornwall — covering PL26 from St Austell, Bugle, St Dennis outward.
- Rural / open-countryside policy area
- ✓ One studio — design, planning and build under one roof
- ✓ Local to Mid Cornwall — not a national franchise
- ✓ Cornwall Council regulars across every sub-area
- ✓ Fixed-fee planning packages, no surprise invoices
Our process
How a Polgooth 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 proof — We typically have one or two extension jobs live in the PL26 area at any time, so the local planning officers know our drawings on sight.
Get a free feasibility viewWhat we focus on
Extensions considerations specific to Polgooth.
01
Wind and sea-spray exposure can drive material choices on west-facing extensions; we detail accordingly.
02
Drainage on older Cornish properties is rarely on a clean modern map; CCTV survey before design is often money well spent.
03
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.
04
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.
Local context
Why Polgooth is its own job.
Two things shape a Polgooth application: parish character and policy. On policy — mining heritage, old plot widths and traditional materials make proportion and detailing more important than generic extension templates. 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. Get that local reading right and the rest of the Polgooth programme tends to run on time. On granite terraces in particular — the kind you'll also find toward Nanpean — 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.
Local watch-list
Local snags worth knowing before drawing a Polgooth extension.
Watch #1
Tighter Local Plan tests on isolated rural dwellings
Polgooth is part of St Austell
Polgooth sits inside the St Austell catchment — we cover both as one extension territory.
See Extensions in St Austell →Local fabric
What sets a Polgooth extension brief apart.
Building stock
Across Polgooth (PL26) we work on miners cottages, granite terraces, chapel conversions, workers cottages, post-war estates. Each stock type drives a different extension response — granite terraces in particular needs careful detailing here.
Parish & policy
Polgooth sits in the parish of Polgooth, which matters for how parish-level consultation lands on a extension application.
Coverage
We cover PL26 from our studio, with regular extension jobs also running in St Austell, Bugle, St Dennis. Most Polgooth site visits get booked within the same week.
Can you handle both planning and build in Polgooth?
Yes — design, planning, building regs and full construction run under one roof. For clients with an existing Polgooth builder we can stop at a tender-ready Full Plans pack instead.
Request a free visitWho this is for
Polgooth runs the full mix — owner-occupier, holiday-let, commercial and the occasional smallholding — so we scope every extension enquiry from the use-class up.
FAQs
Polgooth Extensions — local questions answered.
- How much does an extension cost in Polgooth?
- 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 Polgooth specifically, we'd start by checking the latest parish-level planning history 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.
- 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.
- 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.
Other services in Polgooth
Nearby places we cover
The PL26 stretch of Mid Cornwall has its own rhythm; our extension work respects it, and Cornwall Council usually responds in kind.