East Cornwall · PL18 · Cornwall Council East
Gunnislake 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. In Gunnislake, that work is shaped by the place itself — Gunnislake is a former mining settlement in the PL18 area, with granite terraces, chapel buildings and industrial landscape character still visible, with a building stock that leans toward chapel conversions and miners cottages.
Gunnislake sits in East Cornwall — just off the A38; covering PL18 from Callington, Stoke Climsland, Linkinhorne outward.
- Conservation Area
- Cornish Mining World Heritage Site
- ✓Plain-English feasibility before any drawings
- ✓30+ years of Cornwall Council approvals
- ✓Conservation Area experience built into the fee
- ✓Cornwall Council East sub-area regulars
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Free Gunnislake feasibility call
Tell us about your extension. We reply within 1 working day — no obligation.
Who this is for
In Gunnislake 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 watch-list
The PL18 constraints that shape a extension brief.
Watch #1
Conservation Area controls on materials, window proportions and roof form through central Gunnislake
Watch #2
World Heritage Site heritage assessment where changes are visible in the mining landscape
Watch #3
Party Wall notices and shallow roof voids typical of miners cottages in the PL18 district
Local proof — Most Gunnislake homeowners come to us after a extension quote elsewhere felt vague on planning — we lead with feasibility instead.
Get a free feasibility viewFAQs
Gunnislake 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 Gunnislake 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.
- We live in the house. Can a extension in Gunnislake be done while we stay put?
- Usually yes for single-storey and rear work, with a temporary kitchen or bathroom arrangement agreed before the start. Whole-house remodels and roof work in Gunnislake are often easier if you move out for a few weeks. We set that expectation at feasibility stage rather than halfway through.
- 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.
Quick check
Want a straight answer on whether your Gunnislake project is worth pursuing?
Send a few details — we'll come back within 1 working day with a plain-English view on planning risk, likely cost band and whether it's a project we'd take on.
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Get a free feasibility view
For projects in Gunnislake and the PL18 area.
Scope
What we can draw, survey and build around Gunnislake
Clients in Gunnislake take different slices of this list, and that is deliberate.
Structural coordination
Calculations coordinated with the drawings so building control sees one consistent story.
Planning application drawings
Existing and proposed plans, elevations, site and block plans drawn to validation standard.
Full design and build
One contract from first sketch to handover, with the same team on paper and on site.
Measured survey
An accurate record of what is actually there, which is where most avoidable cost is removed.
Construction and technical drawings
1:10 and 1:20 details for the parts of the job builders normally have to guess at.
Page purpose
Drawings only, or drawings through to handover in Gunnislake?
Both routes are open on a PL18 project, and the honest answer depends on whether you already have a builder you trust. Plenty of Gunnislake clients take the drawings, tender them locally, then come back to us for the build if the numbers do not stack up.
- Route one: feasibility, planning and a tender-ready technical pack
- Route two: the same pack, then the build under one contract
- Either way the survey and feasibility work is identical, so the decision can wait
- Fees quoted per stage against the PL18 scope, not as one opaque figure
Keep reading
Follow the chain: survey, drawings, build
Gunnislake is covered from our Callington run. Being a smaller place, the local detail matters more than the headline policy: lane access, neighbour proximity and what the immediate street already looks like.
Who this is for
Why this page exists, and who it is for
- Drawings, planning and building regulations are all produced in-house, so a extension enquiry does not get passed between firms.
- Designated-area work is routine here, so heritage and landscape statements are produced alongside the drawings rather than outsourced.
- Applications for Gunnislake are handled through Cornwall Council, with Liskeard the nearest planning office we deal with regularly.
Planning rules change and every site is different. For the final position on your address, check with Cornwall Council as the local planning authority or the Planning Portal.
Local context
Why Gunnislake is its own job.
Locally, mining heritage, old plot widths and traditional materials make proportion and detailing more important than generic extension templates. For extension specifically, parts of Gunnislake 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. Which is why we scope Gunnislake projects parish-up, not template-down — the PL18 context shapes the design from day one. Whether the project is on chapel conversions in the centre or further out toward Callington, 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 Gunnislake.
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 Gunnislake 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 Gunnislake homeowners pick a local studio for extension.
Building stock
Across Gunnislake (PL18) we work on miners cottages, granite terraces, chapel conversions, workers cottages, post-war estates. Each stock type drives a different extension response — chapel conversions in particular needs careful detailing here.
Parish & policy
Gunnislake sits in the parish of Gunnislake, which matters for how parish-level consultation lands on a extension application.
Coverage
We cover PL18 from our studio, with regular extension jobs also running in Callington, Stoke Climsland, Linkinhorne. Most Gunnislake site visits get booked within the same week.
What does a first Gunnislake consultation cost?
Nothing. We come to the property, walk the site, talk through what works on a PL18 plot and follow up with a written feasibility note inside a week — no obligation either way.
Request a free visitGunnislake is part of Callington
Gunnislake sits inside the Callington catchment — we cover both as one extension territory.
See Extensions in Callington →Other services in Gunnislake
Nearby places we cover
A extension in Gunnislake stands or falls on how well it reads the street — we treat that as the design brief, not an afterthought. Parish-level consultation in Gunnislake is worth planning for, not reacting to.
One conversation — and a clearer Gunnislake brief We know how miners cottages behave here.
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