East Cornwall · PL17
Extensions Callington: PL17 planning, East 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. What works on a PL17 plot rarely works elsewhere — Callington is an East Cornwall market town between Liskeard and Tavistock, in the Tamar Valley AONB hinterland, with a substantial Georgian and Victorian core, with a building stock that leans toward post-war estates and Victorian terraces.
Callington sits in East Cornwall, inside the PL17 postcode district.
- Conservation Area
- ✓ Free first site visit, no obligation
- ✓ 30+ years of Cornwall Council approvals
- ✓ One studio — design, planning and build under one roof
- ✓ Local to East Cornwall — not a national franchise
Local proof — Our East Cornwall workload means a Callington extension project never has to wait for an out-of-county team to drive down.
Get a free feasibility viewLocal context
Why Callington is its own job.
Conservation Area covers Fore Street and the church area. Tamar Valley AONB lies to the east; significant edge-of-town residential development pressure from Plymouth commuters. That sets the scene before any design work begins. For extension specifically, parts of Callington sit within a designated Conservation Area, which means materials, fenestration and roof pitches all need to read sympathetically with the existing streetscape. It's the kind of detail that decides whether a Callington application gets approved at eight weeks or stalls in committee. The post-war estates that dominate Callington (and continue out toward Saltash) 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 Callington.
01
Drainage on older Cornish properties is rarely on a clean modern map; CCTV survey before design is often money well spent.
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
Wind and sea-spray exposure can drive material choices on west-facing extensions; we detail accordingly.
04
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.
Our process
How a Callington 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 PL17.
Building stock
Across Callington (PL17) we work on Georgian townhouses, Victorian terraces, post-war estates, modern Persimmon and Bellway estates, barn conversions in the Tamar Valley. Each stock type drives a different extension response — post-war estates in particular needs careful detailing here.
Parish & policy
Callington is its own town in East Cornwall, with planning history that's specific to the PL17 catchment.
Coverage
We cover PL17 from our studio, with regular extension jobs also running in Saltash. Most Callington site visits get booked within the same week.
How quickly can you visit a Callington site?
Usually within the same week. Callington (PL17) is on our regular East Cornwall run, alongside Saltash. First visits are free and you'll get an honest feasibility view inside seven days.
Request a free visitFAQs
Callington 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 Callington specifically, we'd start by checking the Conservation Area boundary 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.
Other services in Callington
Nearby places we cover
Designing a extension in Callington is as much about reading the parish as reading the brief; we do both, and the planning outcomes follow.