Mid Cornwall · TR2
Extensions Grampound: TR2 planning, Mid 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. Every Grampound project we take on begins with reading the local context — Grampound is a former rotten borough on the A390 between Truro and St Austell, with a clock tower at the centre of a tight Conservation Area covering the medieval high street, with a building stock that leans toward Edwardian houses and Victorian villas.
Grampound sits in Mid Cornwall — covering TR2 from Tregony, Probus, Ladock outward.
- Conservation Area
- Rural / open-countryside policy area
- ✓ Conservation Area experience built into the fee
- ✓ Free first site visit, no obligation
- ✓ Measured-survey accuracy from day one
- ✓ One studio — design, planning and build under one roof
Local proof — Most Grampound 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 Grampound is its own job.
Conservation Area covers the historic high street. Listed buildings are common; HGV traffic on the A390 shapes some site logistics. That sets the scene before any design work begins. For extension specifically, parts of Grampound sit within a designated Conservation Area, which means materials, fenestration and roof pitches all need to read sympathetically with the existing streetscape; 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 Grampound application gets approved at eight weeks or stalls in committee. The Edwardian houses that dominate Grampound (and continue out toward Ladock) 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 Grampound.
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
Drainage on older Cornish properties is rarely on a clean modern map; CCTV survey before design is often money well spent.
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.
Our process
How a Grampound 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 TR2.
Building stock
Across Grampound (TR2) we work on medieval and Georgian high street terraces, Victorian villas, Edwardian houses, modern infill on field-edge plots. Each stock type drives a different extension response — Edwardian houses in particular needs careful detailing here.
Parish & policy
Grampound is its own town in Mid Cornwall, with planning history that's specific to the TR2 catchment.
Coverage
We cover TR2 from our studio, with regular extension jobs also running in Tregony, Probus, Ladock. Most Grampound site visits get booked within the same week.
How quickly can you visit a Grampound site?
Usually within the same week. Grampound (TR2) is on our regular Mid Cornwall run, alongside Tregony, Probus, Ladock. First visits are free and you'll get an honest feasibility view inside seven days.
Request a free visitFAQs
Grampound Extensions — local questions answered.
- 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. In Grampound specifically, we'd start by checking the Conservation Area boundary before committing to a direction.
- 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.
- 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.
Other services in Grampound
Nearby places we cover
To sum up, our extension approach in Grampound is built entirely around local Cornwall context, ensuring the best possible outcome for your property.