Mid Cornwall · PL26
Nanpean extensions — a Mid Cornwall studio
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. On a Nanpean site, the brief always meets the place — Nanpean is a china-clay village in the PL26 area, with workers housing, industrial landscape and practical family homes forming the local pattern, with a building stock that leans toward workers cottages and bungalows.
Nanpean sits in Mid Cornwall — covering PL26 from St Austell, Bugle, St Dennis outward.
- Rural / open-countryside policy area
- ✓ 30+ years of Cornwall Council approvals
- ✓ rural policy area experience built into the fee
- ✓ Local to Mid Cornwall — not a national franchise
- ✓ Same team on paper as on site
Who this is for
Nanpean 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
Local snags worth knowing before drawing a Nanpean extension.
Watch #1
Tighter Local Plan tests on isolated rural dwellings
Local proof — Most Nanpean extension clients we work with are second-time builders — they've seen the templated approach fail once already.
Get a free feasibility viewFAQs
Nanpean 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 Nanpean specifically, we'd start by checking the latest parish-level planning history before committing to a direction.
- 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.
- 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 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.
Local context
Why Nanpean is its own job.
The planning backdrop in Mid Cornwall is real, not abstract: ground conditions, drainage, former industrial land and simple robust materials tend to shape the design and technical brief. 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. Treat the PL26 parish brief as the design brief and the Nanpean application has somewhere to land. Whether the project is on workers cottages in the centre or further out toward St Austell, 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 Nanpean.
01
Wind and sea-spray exposure can drive material choices on west-facing extensions; we detail accordingly.
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
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
Cornish granite and slate-hung walls react differently to new openings than modern brickwork — lintel choice and structural sequencing matter.
Our process
How a Nanpean 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 a Mid Cornwall studio is the right fit for Nanpean extension.
Building stock
Across Nanpean (PL26) we work on workers cottages, terraced houses, post-war estates, bungalows, former industrial plots. Each stock type drives a different extension response — workers cottages in particular needs careful detailing here.
Parish & policy
Nanpean sits in the parish of Nanpean, 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 Nanpean site visits get booked within the same week.
What does a first Nanpean consultation cost?
Nothing. We come to the property, walk the site, talk through what works on a PL26 plot and follow up with a written feasibility note inside a week — no obligation either way.
Request a free visitNanpean is part of St Austell
Nanpean sits inside the St Austell catchment — we cover both as one extension territory.
See Extensions in St Austell →Other services in Nanpean
Nearby places we cover
From initial feasibility to final handover, we manage extension projects across Nanpean with careful attention to what makes Mid Cornwall unique.