East Cornwall · PL31 · Cornwall Council North
House extension costs in Bodmin — what PL31 homeowners actually pay
Most Bodmin cost questions land in the same bracket: a single-storey rear sits roughly £2,200–£2,800/m² built, a two-storey side runs £2,000–£2,500/m², and anything touching a stone-fronted elevation tends to add 8–12% for materials and detailing. We quote on measured drawings, not guesses. 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 Bodmin site, the brief always meets the place — Bodmin is the historic county town and sits on the south-western edge of Bodmin Moor, with a substantial fifteenth-century church, the Beacon viewpoint and a Conservation Area covering the medieval core, with a building stock that leans toward post-war estates and medieval and Georgian townhouses.
Bodmin sits in East Cornwall — just off the A30; with Truro the closest city; covering PL31 from Lanivet, Blisland, Cardinham outward.
- Conservation Area
- ✓ Typical Bodmin single-storey rear: £55k–£85k build cost
- ✓ Two-storey side extension: £85k–£140k build cost
- ✓ Wrap-around / L-shaped: £110k–£180k build cost
- ✓ Design + planning + building regs fee from £4,800 (fixed)
Local proof — Recent extension enquiries from Bodmin have clustered around post-war estates — we know the route through Cornwall Council on these.
Get a free feasibility viewLocal context
Why Bodmin is its own job.
Locally, conservation Area covers the historic streets including Fore Street and Honey Street. Bodmin Moor (separately AONB) lies to the east; Bodmin Town Council operates active input on town centre regeneration. For extension specifically, parts of Bodmin sit within a designated Conservation Area, which means materials, fenestration and roof pitches all need to read sympathetically with the existing streetscape. Which is why we scope Bodmin projects parish-up, not template-down — the PL31 context shapes the design from day one. Whether the project is on post-war estates in the centre or further out toward Lanivet, 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 Bodmin.
01
Cornish granite and slate-hung walls react differently to new openings than modern brickwork — lintel choice and structural sequencing matter.
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
Wind and sea-spray exposure can drive material choices on west-facing extensions; we detail accordingly.
Our process
How a Bodmin 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 Bodmin homeowners pick a local studio for extension.
Building stock
Across Bodmin (PL31) we work on medieval and Georgian townhouses, Victorian terraces, post-war estates, modern Persimmon and Bellway estates, barn conversions on the moor edge. Each stock type drives a different extension response — post-war estates in particular needs careful detailing here.
Parish & policy
Bodmin is its own town in East Cornwall, with planning history that's specific to the PL31 catchment.
Coverage
We cover PL31 from our studio, with regular extension jobs also running in Lanivet, Blisland, Cardinham. Most Bodmin site visits get booked within the same week.
What does a first Bodmin consultation cost?
Nothing. We come to the property, walk the site, talk through what works on a PL31 plot and follow up with a written feasibility note inside a week — no obligation either way.
Request a free visitRecent work nearby
Bodmin Moor-edge barn conversion last year ran as a Class Q with a heritage statement.
See more recent East Cornwall work →FAQs
Bodmin Extensions — local questions answered.
- What's the average cost of a single-storey extension in Bodmin?
- For a typical 20–30m² rear extension in Bodmin (PL31) we'd expect £55k–£85k including VAT, depending on glazing spec and whether the kitchen is being reworked. Coastal exposure here pushes weather-tightness specs up, which is real money.
- Do extension costs in Bodmin include planning and building regs?
- Our fixed-fee design package covers measured survey, planning drawings, building regs and a tendered cost plan. Build cost is separate and quoted from drawings — never guessed from a phone call.
- What pushes a Bodmin extension over budget?
- Three things: ground conditions you didn't survey for, a planning condition that drives a material change, and "while we're at it" scope creep. We screen all three at feasibility stage so the number you start with is the number you finish on.
- 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 Bodmin 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.
Bodmin is the hub for these neighbourhoods
We run extensions across Bodmin and the surrounding PL31 neighbourhoods — same studio, same site team.
- St Breward
PL30
- Washaway
PL30
- Nanstallon
PL30
- Cardinham
PL30
- Mount
PL30
- Warleggan
PL30
- Temple
PL30
- St Tudy
PL30
- Helland
PL30
Other services in Bodmin
Nearby places we cover
Local neighbourhoods in Bodmin
If you're scoping an extension in Bodmin, the honest number depends on three things: ground conditions, finish level and how much of the existing fabric stays. We'll tell you which bracket you're in before you commit to a fee.
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