North Cornwall · PL27
Design, planning and build for St Minver 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. A PL27 site visit comes before a St Minver sketch, every time — St Minver is a rural parish in the PL27 area, with farmsteads, lanes and scattered homes defining its built character, with a building stock that leans toward smallholdings and rural cottages.
St Minver sits in North Cornwall — covering PL27 from Rock, Truro, St Austell 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 Minver 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 Minver is its own job.
Cornwall Council's lens on St Minver is consistent: open-countryside policy, access lanes, drainage and agricultural building history all need to be addressed before drawings go too far. 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 Minver project as a PL27-area job first — not a generic Cornwall job with a postcode bolted on. The smallholdings that dominate St Minver (and continue out toward St Austell) 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 Minver.
01
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.
02
Cornish granite and slate-hung walls react differently to new openings than modern brickwork — lintel choice and structural sequencing matter.
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
Drainage on older Cornish properties is rarely on a clean modern map; CCTV survey before design is often money well spent.
Our process
How a St Minver 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 North Cornwall studio is the right fit for St Minver extension.
Building stock
Across St Minver (PL27) we work on farmhouses, converted barns, rural cottages, smallholdings, scattered modern homes. Each stock type drives a different extension response — smallholdings in particular needs careful detailing here.
Parish & policy
St Minver sits in the parish of St Minver, which matters for how parish-level consultation lands on a extension application.
Coverage
We cover PL27 from our studio, with regular extension jobs also running in Rock, Truro, St Austell. Most St Minver site visits get booked within the same week.
How quickly can you visit a St Minver site?
Usually within the same week. St Minver (PL27) is on our regular North Cornwall run, alongside Rock, Truro, St Austell. First visits are free and you'll get an honest feasibility view inside seven days.
Request a free visitFAQs
St Minver 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 Minver 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.
- 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.
St Minver is part of Rock
St Minver sits inside the Rock catchment — we cover both as one extension territory.
See Extensions in Rock →Other services in St Minver
Nearby places we cover
Most St Minver extension enquiries start with one honest conversation about what's actually allowed — and that conversation costs nothing.