Mid Cornwall · TR15 · Cornwall Council West
House Extensions in Redruth
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. The Redruth version of this work has its own character — Redruth shares the Cornish Mining World Heritage status with neighbouring Camborne, with the granite outcrop of Carn Brea as its backdrop and a steep, terraced town centre dropping down to Fore Street, with a building stock that leans toward miners' cottages and Wesleyan chapels and former chapels.
Redruth sits in Mid Cornwall — just off the A30; with Truro the closest city; 4 miles from Camborne.
- Conservation Area
- Cornish Mining World Heritage Site
- ✓ Local to Mid Cornwall — not a national franchise
- ✓ Same team on paper as on site
- ✓ Fixed-fee planning packages, no surprise invoices
- ✓ Measured-survey accuracy from day one
Local watch-list
The TR15 constraints that shape a extension brief.
Watch #1
World Heritage Site assessment on principal elevations facing the mining landscape
Watch #2
Shallow-pitched Cornish slate roofs limiting loft headroom
Watch #3
Party Wall awards on dense Victorian terraces
Watch #4
Below-ground voids from historic mining requiring structural caution
Who this is for
In Redruth the extension brief is almost always a private homeowner improving a forever home — so we lead with feasibility and long-term value, not show-home rhetoric.
Local context
Why Redruth is its own job.
Conservation Area coverage runs through Fore Street, West End and Clinton Road; Carn Brea and the surrounding mining landscape add a heritage layer over much of the town's edges. World Heritage assessment is part of most non-trivial applications. For extension specifically, parts of Redruth sit within a designated Conservation Area, which means materials, fenestration and roof pitches all need to read sympathetically with the existing streetscape; the wider area forms part of the Cornish Mining World Heritage Site, which adds a heritage assessment layer to most material changes. So every Redruth job runs as a TR15-specific piece of work — local policy, local fabric, local builders. Most of our extension work in Redruth lands on miners' cottages, with detailing that has to nod to the wider Camborne streetscape.
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 Redruth.
01
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.
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.
Recent work nearby
Recent West End terrace loft conversion squeaked through at 2.15m ridge-to-joist with a slim ridge raise.
See more recent Mid Cornwall work →Our process
How a Redruth 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.
FAQs
Redruth Extensions — local questions answered.
- 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. In Redruth specifically, we'd start by checking the Conservation Area boundary before committing to a direction.
- 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.
- 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.
Local proof — We typically have one or two extension jobs live in the TR15 area at any time, so the local planning officers know our drawings on sight.
Get a free feasibility viewOther services in Redruth
Nearby places we cover
If you're considering a extension project in the TR15 area, our deep understanding of Redruth's architectural character can help navigate the process smoothly.