Mid Cornwall · PL24
St Blazey extension — feasibility first, drawings second
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. Anchor any St Blazey extension in the local fabric and the rest follows — St Blazey is a small industrial settlement in the PL24 catchment, shaped by historic works, transport links and everyday village housing, with a building stock that leans toward former industrial buildings and workers cottages.
St Blazey sits in Mid Cornwall — covering PL24 from St Austell, Bugle, St Dennis outward.
- Conservation Area
- ✓ Conservation Area experience built into the fee
- ✓ Cornwall Council regulars across every sub-area
- ✓ Free first site visit, no obligation
- ✓ Plain-English feasibility before any drawings
Who this is for
St Blazey runs the full mix — owner-occupier, holiday-let, commercial and the occasional smallholding — so we scope every extension enquiry from the use-class up.
Local watch-list
St Blazey-specific issues we screen on the first visit.
Watch #1
Conservation Area material and fenestration controls in central St Blazey
Local proof — Most St Blazey homeowners come to us after a extension quote elsewhere felt vague on planning — we lead with feasibility instead.
Get a free feasibility viewFAQs
St Blazey Extensions — local questions answered.
- 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. In St Blazey specifically, we'd start by checking the Conservation Area boundary before committing to a direction.
- 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.
- 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.
Local context
Why St Blazey is its own job.
Locally, old industrial plots, heritage remnants and mixed residential edges mean design statements need to explain scale, access and materials clearly. For extension specifically, parts of St Blazey 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 St Blazey projects parish-up, not template-down — the PL24 context shapes the design from day one. Whether the project is on former industrial buildings in the centre or further out toward St Austell, 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 St Blazey.
01
Wind and sea-spray exposure can drive material choices on west-facing extensions; we detail accordingly.
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
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 St Blazey 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 PL24.
Building stock
Across St Blazey (PL24) we work on workers cottages, stone terraces, former industrial buildings, post-war houses, small infill plots. Each stock type drives a different extension response — former industrial buildings in particular needs careful detailing here.
Parish & policy
St Blazey sits in the parish of St Blazey, which matters for how parish-level consultation lands on a extension application.
Coverage
We cover PL24 from our studio, with regular extension jobs also running in St Austell, Bugle, St Dennis. Most St Blazey site visits get booked within the same week.
What does a first St Blazey consultation cost?
Nothing. We come to the property, walk the site, talk through what works on a PL24 plot and follow up with a written feasibility note inside a week — no obligation either way.
Request a free visitSt Blazey is part of St Austell
St Blazey sits inside the St Austell catchment — we cover both as one extension territory.
See Extensions in St Austell →Other services in St Blazey
Nearby places we cover
A extension in St Blazey stands or falls on how well it reads the street — we treat that as the design brief, not an afterthought.