South Cornwall · PL26 · Cornwall Council Mid
Mevagissey 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 Mevagissey extension in the local fabric and the rest follows — Mevagissey is a working fishing port south of St Austell, with the second-busiest fishing fleet in Cornwall and an exceptionally dense Conservation Area of slate-hung cottages around its inner and outer harbours, with a building stock that leans toward slate-hung fishermen's cottages and modern infill on the village fringes.
Mevagissey sits in South Cornwall — just off the B3273; with Truro the closest city; 5 miles from St Austell.
- Conservation Area
- Cornwall AONB
- Coastal exposure zone
- ✓ Free first site visit, no obligation
- ✓ Plain-English feasibility before any drawings
- ✓ 30+ years of Cornwall Council approvals
- ✓ Conservation Area experience built into the fee
Who this is for
Mevagissey 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
Common Mevagissey pitfalls we plan around.
Watch #1
South Coast Western Cornwall AONB and Heritage Coast designation
Watch #2
Conservation Area covering the harbour and historic core
Watch #3
Stepped, vehicle-restricted lanes for material delivery
Watch #4
Slate-hung and lime-render detailing essentially required
Local proof — We typically have one or two extension jobs live in the PL26 area at any time, so the local planning officers know our drawings on sight.
Get a free feasibility viewFAQs
Mevagissey 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 Mevagissey 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.
- 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.
- 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.
Local context
Why Mevagissey is its own job.
Locally, conservation Area covers the entire historic harbour area; AONB across most of the parish. Slate-hung walls and traditional sash windows are the design baseline; modern alterations face high scrutiny. For extension specifically, parts of Mevagissey sit within a designated Conservation Area, which means materials, fenestration and roof pitches all need to read sympathetically with the existing streetscape; the surrounding landscape falls inside the Cornwall Area of Outstanding Natural Beauty, so massing, height and landscape impact carry extra weight in any planning decision; coastal salt-laden air around Mevagissey drives detailing choices — fixings, render systems and timber treatments all need to be specified for exposure. Which is why we scope Mevagissey projects parish-up, not template-down — the PL26 context shapes the design from day one. Whether the project is on slate-hung fishermen's cottages in the centre or further out toward Gorran Haven, 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.
Recent work nearby
Inner-harbour cottage we worked on retained the slate-hung gable and reorganised behind.
See more recent South Cornwall work →What we focus on
Extensions considerations specific to Mevagissey.
01
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.
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
Drainage on older Cornish properties is rarely on a clean modern map; CCTV survey before design is often money well spent.
04
Cornish granite and slate-hung walls react differently to new openings than modern brickwork — lintel choice and structural sequencing matter.
Our process
How a Mevagissey 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 Mevagissey homeowners pick a local studio for extension.
Building stock
Across Mevagissey (PL26) we work on slate-hung fishermen's cottages, Victorian terraces above the harbour, Edwardian guesthouses, modern infill on the village fringes. Each stock type drives a different extension response — slate-hung fishermen's cottages in particular needs careful detailing here.
Parish & policy
Mevagissey is its own town in South Cornwall, with planning history that's specific to the PL26 catchment.
Coverage
We cover PL26 from our studio, with regular extension jobs also running in St Austell, Gorran Haven. Most Mevagissey site visits get booked within the same week.
What does a first Mevagissey consultation cost?
Nothing. We come to the property, walk the site, talk through what works on a PL26 plot and follow up with a written feasibility note inside a week — no obligation either way.
Request a free visitOther services in Mevagissey
Nearby places we cover
A extension in Mevagissey stands or falls on how well it reads the street — we treat that as the design brief, not an afterthought.