East Cornwall · PL15 · Cornwall Council East
Extensions for Launceston (PL15)
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 Launceston starts with a measured walk-round — Launceston is the ancient capital of Cornwall, just over the Tamar from Devon, with the Norman castle, walled medieval core and a substantial Conservation Area covering the historic streets, with a building stock that leans toward Edwardian villas and modern Bovis and Persimmon estates.
Launceston sits in East Cornwall — just off the A30; with Exeter the closest city.
- Conservation Area
- ✓ Measured-survey accuracy from day one
- ✓ One studio — design, planning and build under one roof
- ✓ Fixed-fee planning packages, no surprise invoices
- ✓ Same team on paper as on site
Our process
How a Launceston 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 — Most Launceston extension clients we work with are second-time builders — they've seen the templated approach fail once already.
Get a free feasibility viewWhat we focus on
Extensions considerations specific to Launceston.
01
Drainage on older Cornish properties is rarely on a clean modern map; CCTV survey before design is often money well spent.
02
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.
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
Cornish granite and slate-hung walls react differently to new openings than modern brickwork — lintel choice and structural sequencing matter.
Local context
Why Launceston is its own job.
In Launceston the planning picture is specific: conservation Area is extensive, covering the medieval walled town, the castle approach and the southern Conservation Area at Newport. Listed buildings are common; significant edge-of-town development pressure on the A30. For extension specifically, parts of Launceston sit within a designated Conservation Area, which means materials, fenestration and roof pitches all need to read sympathetically with the existing streetscape. That local reading is what makes a Launceston (PL15) project different from a generic Cornwall scheme — and is the whole reason we work this way. On Edwardian villas in particular — the kind you'll also find toward East Cornwall — 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
What usually catches extension projects out in Launceston.
Watch #1
Town walls and castle setting scrutiny on central plots
Watch #2
Steep medieval street grain restricting access
Watch #3
Conservation Area boundary cutting across mixed-age stock
Watch #4
Tamar Valley AONB at the east edge
Local fabric
One PL15 studio, one extension job — start to finish.
Building stock
Across Launceston (PL15) we work on medieval and Georgian townhouses, Victorian terraces, Edwardian villas, post-war estates, modern Bovis and Persimmon estates. Each stock type drives a different extension response — Edwardian villas in particular needs careful detailing here.
Parish & policy
Launceston is its own town in East Cornwall, with planning history that's specific to the PL15 catchment.
Coverage
We cover PL15 from our studio, with regular extension jobs also running in East Cornwall. Most Launceston site visits get booked within the same week.
Can you handle both planning and build in Launceston?
Yes — design, planning, building regs and full construction run under one roof. For clients with an existing Launceston builder we can stop at a tender-ready Full Plans pack instead.
Request a free visitRecent work nearby
Recent Southgate-adjacent shop-to-flat we delivered kept the Georgian shopfront and inserted a contemporary rear pod.
See more recent East Cornwall work →Who this is for
In Launceston the extension brief is almost always a private homeowner improving a forever home — so we lead with feasibility and long-term value, not show-home rhetoric.
FAQs
Launceston Extensions — local questions answered.
- 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. In Launceston specifically, we'd start by checking the Conservation Area boundary before committing to a direction.
- 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.
- 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.
- 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.
Other services in Launceston
Nearby places we cover
The PL15 stretch of East Cornwall has its own rhythm; our extension work respects it, and Cornwall Council usually responds in kind.