North Cornwall · TR5 · Cornwall Council North
Extensions for Goonbell (TR5)
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. Goonbell sits in North Cornwall, and that geography ends up in the drawings — Goonbell is a former mining settlement in the TR5 area, with granite terraces, chapel buildings and industrial landscape character still visible, with a building stock that leans toward post-war estates and granite terraces.
Goonbell sits in North Cornwall — just off the A39; covering TR5 from St Agnes, Mount Hawke, Trevellas outward.
- Cornish Mining World Heritage Site
- Rural / open-countryside policy area
- ✓One studio — design, planning and build under one roof
- ✓Local to North Cornwall — not a national franchise
- ✓Measured-survey accuracy from day one
- ✓Free first site visit, no obligation
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Free Goonbell feasibility call
Tell us about your extension. We reply within 1 working day — no obligation.
Page purpose
Drawings only, or drawings through to handover in Goonbell?
Both routes are open on a TR5 project, and the honest answer depends on whether you already have a builder you trust. Plenty of Goonbell 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 TR5 scope, not as one opaque figure
Scope
Scope options for Goonbell clients
Not every project needs every stage. On a Goonbell job we scope to what the site and the consent route actually require.
Planning application drawings
Existing and proposed plans, elevations, site and block plans drawn to validation standard.
Measured survey
An accurate record of what is actually there, which is where most avoidable cost is removed.
Heritage and design statements
Written justification where designation makes the design case as important as the drawing.
Structural coordination
Calculations coordinated with the drawings so building control sees one consistent story.
Full design and build
One contract from first sketch to handover, with the same team on paper and on site.
Local watch-list
Goonbell-specific issues we screen on the first visit.
Watch #1
World Heritage Site heritage assessment where changes are visible in the mining landscape
Watch #2
Local Plan tests on isolated dwellings, plus lane access for plant and deliveries around Goonbell
Watch #3
Party Wall notices and shallow roof voids typical of miners cottages in the TR5 district
Who this is for
Straight facts about working with us here
- Applications for Goonbell are handled through Cornwall Council, with Bodmin the nearest planning office we deal with regularly.
- Designated-area work is routine here, so heritage and landscape statements are produced alongside the drawings rather than outsourced.
- Drawings, planning and building regulations are all produced in-house, so a extension enquiry does not get passed between firms.
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.
What we focus on
Extensions considerations specific to Goonbell.
01
Drainage on older Cornish properties is rarely on a clean modern map; CCTV survey before design is often money well spent.
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
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
Cornish granite and slate-hung walls react differently to new openings than modern brickwork — lintel choice and structural sequencing matter.
Quick check
Want a straight answer on whether your Goonbell 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 Goonbell and the TR5 area.
Local context
Why Goonbell is its own job.
In Goonbell the planning picture is specific: mining heritage, old plot widths and traditional materials make proportion and detailing more important than generic extension templates. For extension specifically, the wider area forms part of the Cornish Mining World Heritage Site, which adds a heritage assessment layer to most material changes; 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. That local reading is what makes a Goonbell (TR5) project different from a generic Cornwall scheme — and is the whole reason we work this way. On post-war estates in particular — the kind you'll also find toward Mithian — the extension brief always has to read the existing fabric first.
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.
Our process
How a Goonbell 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
Goonbell Extensions — local questions answered.
- How much does an extension cost in Goonbell?
- 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. In Goonbell specifically, we'd start by checking the latest parish-level planning history before committing to a direction.
- 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 Goonbell 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 Goonbell are often easier if you move out for a few weeks. We set that expectation at feasibility stage rather than halfway through.
- 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.
- 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.
Goonbell is part of St Agnes
Goonbell sits inside the St Agnes catchment — we cover both as one extension territory.
See Extensions in St Agnes →Keep reading
Where to go next from Goonbell
Goonbell is covered from our St Agnes 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.
Other services in Goonbell
Nearby places we cover
Designing a extension in Goonbell is as much about reading the parish as reading the brief; we do both, and the planning outcomes follow. Applications are dealt with through Cornwall Council, with Bodmin the office we deal with most for TR5.
Ready to discuss your project in Goonbell? We are on the A39 regularly.
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