West Cornwall · TR17 · Cornwall Council West
Marazion extensions — a West 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. Anchor any Marazion extension in the local fabric and the rest follows — Marazion sits opposite St Michael's Mount across a tidal causeway and is one of Cornwall's oldest chartered towns, designated AONB for its setting, with a building stock that leans toward Georgian seafront houses and Victorian villas.
Marazion sits in West Cornwall — just off the A30; with Truro the closest city; 3 miles from Penzance.
- Conservation Area
- Cornwall AONB
- Coastal exposure zone
- ✓Free first site visit, no obligation
- ✓Plain-English feasibility before any drawings
- ✓Cornwall Council West sub-area regulars
- ✓One studio — design, planning and build under one roof
Free · No obligation
Free Marazion feasibility call
Tell us about your extension. We reply within 1 working day — no obligation.
Local proof — Our West Cornwall workload means a Marazion extension project never has to wait for an out-of-county team to drive down.
Get a free feasibility viewLocal context
Why Marazion is its own job.
The planning backdrop in West Cornwall is real, not abstract: the whole town centre is within the Conservation Area and the AONB; views to and from St Michael's Mount are a material planning consideration on most schemes. Roof pitches, ridge heights and seaward elevations are tightly controlled. For extension specifically, parts of Marazion 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 Marazion drives detailing choices — fixings, render systems and timber treatments all need to be specified for exposure. Treat the TR17 parish brief as the design brief and the Marazion application has somewhere to land. Whether the project is on Georgian seafront houses in the centre or further out toward Goldsithney, 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 Marazion.
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
Wind and sea-spray exposure can drive material choices on west-facing extensions; we detail accordingly.
03
Drainage on older Cornish properties is rarely on a clean modern map; CCTV survey before design is often money well spent.
04
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.
Scope
What we can draw, survey and build around Marazion
Clients in Marazion take different slices of this list, and that is deliberate.
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.
Heritage and design statements
Written justification where designation makes the design case as important as the drawing.
Building regulation drawings
Full Plans sets with sections, construction notes and coordinated structural information.
Page purpose
Drawings only, or drawings through to handover in Marazion?
Both routes are open on a TR17 project, and the honest answer depends on whether you already have a builder you trust. Plenty of Marazion 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 TR17 scope, not as one opaque figure
Keep reading
Follow the chain: survey, drawings, build
Marazion works as a hub for us: the same extension team covers Perranuthnoe, Goldsithney, Long Rock and the surrounding TR17 villages, so a site visit here often takes in more than one address.
Who this is for
Why this page exists, and who it is for
- Designated-area work is routine here, so heritage and landscape statements are produced alongside the drawings rather than outsourced.
- Sites we know on the ground here include the area around the causeway and St Michael's Mount.
- Design and build are offered from the same studio, which means the person answering your Marazion questions has seen the detail built.
- Applications for Marazion are handled through Cornwall Council, with Truro 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.
Our process
How a Marazion 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.
Quick check
Want a straight answer on whether your Marazion 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 Marazion and the TR17 area.
Local fabric
Choosing a extension team that actually knows TR17.
Building stock
Across Marazion (TR17) we work on granite cottages, Georgian seafront houses, Victorian villas, 1960s bungalows on Green Lane, modern coastal builds. Each stock type drives a different extension response — Georgian seafront houses in particular needs careful detailing here.
Parish & policy
Marazion is its own town in West Cornwall, with planning history that's specific to the TR17 catchment.
Coverage
We cover TR17 from our studio, with regular extension jobs also running in Penzance, Goldsithney, Perranuthnoe. Most Marazion site visits get booked within the same week.
What does a first Marazion consultation cost?
Nothing. We come to the property, walk the site, talk through what works on a TR17 plot and follow up with a written feasibility note inside a week — no obligation either way.
Request a free visitRecent work nearby
Behind-the-Square cottage we extended last winter used a slim glazed link to keep the original roof intact.
See more recent West Cornwall work →FAQs
Marazion 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 Marazion 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 Marazion 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 Marazion 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.
Marazion is the hub for these neighbourhoods
We run extensions across Marazion and the surrounding TR17 neighbourhoods — same studio, same site team.
- Perranuthnoe
TR20
- Goldsithney
TR20
- Long Rock
TR20
Other services in Marazion
Nearby places we cover
Local neighbourhoods in Marazion
The extension jobs we're proudest of in Marazion are the ones where the planning route was clear before a single elevation was drawn. Applications are dealt with through Cornwall Council, with Truro the office we deal with most for TR17.
Decide the route after the free Marazion visit Free first visit, TR17 included.
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