Roseland · TR2
St Just in Roseland extensions — a Roseland 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. On a St Just in Roseland site, the brief always meets the place — St Just in Roseland is a creekside settlement in the TR2 area, with waterside homes, wooded valleys and narrow-lane access shaping the brief, with a building stock that leans toward creekside cottages and converted barns.
St Just in Roseland sits in Roseland — covering TR2 from St Mawes, Truro, St Austell outward.
- Conservation Area
- Cornwall AONB
- Coastal exposure zone
- ✓ Free first site visit, no obligation
- ✓ Plain-English feasibility before any drawings
- ✓ One studio — design, planning and build under one roof
- ✓ Local to Roseland — not a national franchise
Who this is for
St Just in Roseland 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
Local snags worth knowing before drawing a St Just in Roseland extension.
Watch #1
Conservation Area material and fenestration controls in central St Just in Roseland
Watch #2
AONB landscape-impact scrutiny on visible elevations
Watch #3
Coastal exposure driving fixing, render and joinery spec
Local proof — Most St Just in Roseland extension clients we work with are second-time builders — they've seen the templated approach fail once already.
Get a free feasibility viewFAQs
St Just in Roseland Extensions — local questions answered.
- 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. In St Just in Roseland 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.
- 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.
- 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 Just in Roseland is its own job.
The planning backdrop in Roseland is real, not abstract: creekside ecology, flood risk, trees and views across the water often matter as much as the building form itself. For extension specifically, parts of St Just in Roseland 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 St Just in Roseland drives detailing choices — fixings, render systems and timber treatments all need to be specified for exposure. Treat the TR2 parish brief as the design brief and the St Just in Roseland application has somewhere to land. Whether the project is on creekside cottages in the centre or further out toward St Mawes, 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 Just in Roseland.
01
Drainage on older Cornish properties is rarely on a clean modern map; CCTV survey before design is often money well spent.
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
Wind and sea-spray exposure can drive material choices on west-facing extensions; we detail accordingly.
Our process
How a St Just in Roseland 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 TR2.
Building stock
Across St Just in Roseland (TR2) we work on creekside cottages, detached houses, boat sheds, converted barns, waterside homes. Each stock type drives a different extension response — creekside cottages in particular needs careful detailing here.
Parish & policy
St Just in Roseland sits in the parish of St Just in Roseland, which matters for how parish-level consultation lands on a extension application.
Coverage
We cover TR2 from our studio, with regular extension jobs also running in St Mawes, Truro, St Austell. Most St Just in Roseland site visits get booked within the same week.
What does a first St Just in Roseland consultation cost?
Nothing. We come to the property, walk the site, talk through what works on a TR2 plot and follow up with a written feasibility note inside a week — no obligation either way.
Request a free visitSt Just in Roseland is part of St Mawes
St Just in Roseland sits inside the St Mawes catchment — we cover both as one extension territory.
See Extensions in St Mawes →Other services in St Just in Roseland
Nearby places we cover
From initial feasibility to final handover, we manage extension projects across St Just in Roseland with careful attention to what makes Roseland unique.