East Cornwall · PL12
Hatt extensions — a East Cornwall studio
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. In Hatt, that work is shaped by the place itself — Hatt is a commuter village in the PL12 area, with everyday family housing, edge-of-village plots and quick routes to its parent town, with a building stock that leans toward older cottages and garden infill plots.
Hatt sits in East Cornwall — covering PL12 from Saltash, Landrake, Tideford outward.
- Rural / open-countryside policy area
- ✓ Cornwall Council regulars across every sub-area
- ✓ Free first site visit, no obligation
- ✓ 30+ years of Cornwall Council approvals
- ✓ Same team on paper as on site
Who this is for
Hatt 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
What usually catches extension projects out in Hatt.
Watch #1
Tighter Local Plan tests on isolated rural dwellings
Local proof — Our East Cornwall workload means a Hatt extension project never has to wait for an out-of-county team to drive down.
Get a free feasibility viewFAQs
Hatt 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 Hatt specifically, we'd start by checking the latest parish-level planning history 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 Hatt is its own job.
The planning backdrop in East Cornwall is real, not abstract: applications here usually turn on neighbour amenity, parking, overlooking and whether new work fits the rhythm of existing streets. For extension specifically, Cornwall Council's Local Plan applies tighter tests to isolated rural dwellings here, so design rationale and policy fit need to be set out clearly from the outset. Treat the PL12 parish brief as the design brief and the Hatt application has somewhere to land. Whether the project is on older cottages in the centre or further out toward Saltash, 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 Hatt.
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
Wind and sea-spray exposure can drive material choices on west-facing extensions; we detail accordingly.
04
Drainage on older Cornish properties is rarely on a clean modern map; CCTV survey before design is often money well spent.
Our process
How a Hatt 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 a East Cornwall studio is the right fit for Hatt extension.
Building stock
Across Hatt (PL12) we work on post-war semis, bungalows, modern estates, older cottages, garden infill plots. Each stock type drives a different extension response — older cottages in particular needs careful detailing here.
Parish & policy
Hatt sits in the parish of Hatt, which matters for how parish-level consultation lands on a extension application.
Coverage
We cover PL12 from our studio, with regular extension jobs also running in Saltash, Landrake, Tideford. Most Hatt site visits get booked within the same week.
What does a first Hatt consultation cost?
Nothing. We come to the property, walk the site, talk through what works on a PL12 plot and follow up with a written feasibility note inside a week — no obligation either way.
Request a free visitHatt is part of Saltash
Hatt sits inside the Saltash catchment — we cover both as one extension territory.
See Extensions in Saltash →Other services in Hatt
Nearby places we cover
The extension jobs we're proudest of in Hatt are the ones where the planning route was clear before a single elevation was drawn.