Mid Cornwall · PL25 · Cornwall Council Mid
One studio for new build in Trewoon
A bespoke new build is the longest project we do, and the most rewarding. From plot appraisal through planning, building regulations and construction, you work with one team from the first sketch to the handover walk-round. The way we approach new build in Trewoon starts with a measured walk-round — Trewoon is a commuter village in the PL25 area, with everyday family housing, edge-of-village plots and quick routes to its parent town, with a building stock that leans toward older cottages and post-war semis.
Trewoon sits in Mid Cornwall — just off the A390; covering PL25 from St Austell, Bugle, St Dennis outward.
- Rural / open-countryside policy area
- ✓One studio — design, planning and build under one roof
- ✓Local to Mid Cornwall — not a national franchise
- ✓30+ years of Cornwall Council approvals
- ✓Measured-survey accuracy from day one
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Free Trewoon feasibility call
Tell us about your new build. We reply within 1 working day — no obligation.
Page purpose
Drawings only, or drawings through to handover in Trewoon?
Both routes are open on a PL25 project, and the honest answer depends on whether you already have a builder you trust. Plenty of Trewoon 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 PL25 scope, not as one opaque figure
Scope
Scope options for Trewoon clients
Clients in Trewoon take different slices of this list, and that is deliberate.
Building regulation drawings
Full Plans sets with sections, construction notes and coordinated structural information.
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.
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.
Local watch-list
What usually catches new build projects out in Trewoon.
Watch #1
Local Plan tests on isolated dwellings, plus lane access for plant and deliveries around Trewoon
Watch #2
Trussed roofs and shallow foundations in the later PL25 estates, which change the structural strategy
Who this is for
Straight facts about working with us here
- Drawings, planning and building regulations are all produced in-house, so a new build enquiry does not get passed between firms.
- Applications for Trewoon are handled through Cornwall Council, with St Austell the nearest planning office we deal with regularly.
- Design and build are offered from the same studio, which means the person answering your Trewoon questions has seen the detail built.
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
New Builds considerations specific to Trewoon.
01
AONB and Heritage Coast designations apply to large stretches of the county; isolated new builds outside settlement boundaries face a much higher policy bar.
02
Off-grid services — package treatment plants, borehole supply, off-mains gas — are common on rural Cornish plots and need designing, not assuming.
03
Replacement dwellings have specific volumetric tests — getting the ratio between existing footprint and proposed floor area right is the difference between approval and refusal.
04
Self-build CIL exemption requires the right documentation in the right order; missing a step costs five-figure sums.
Quick check
Want a straight answer on whether your Trewoon 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 Trewoon and the PL25 area.
Local context
Why Trewoon is its own job.
Two things shape a Trewoon application: parish character and policy. On policy — applications here usually turn on neighbour amenity, parking, overlooking and whether new work fits the rhythm of existing streets. For new build specifically, 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. Get that local reading right and the rest of the Trewoon programme tends to run on time. On older cottages in particular — the kind you'll also find toward Nanpean — the new build brief always has to read the existing fabric first.
Planning note
Cornwall's planning policy on new dwellings is among the most restrictive in England outside Greater London. The first conversation should be a planning conversation, not a design one.
Our process
How a Trewoon new build project runs.
Step 1
Plot review
Site visit, planning history check, designation review and an honest feasibility verdict.
Step 2
Concept design
Sketches that test the plot in massing, orientation and approach before any drawings are committed.
Step 3
Planning
Pre-app, full planning, consultee management and condition discharge.
Step 4
Technical design and build prep
Building regs, structural design, services strategy and contractor procurement.
Step 5
Construction and handover
Build delivered under contract administration with regular client reviews.
Most bespoke new builds run eighteen to thirty months from instruction to keys, depending on site, planning route and build complexity.
FAQs
Trewoon New Builds — local questions answered.
- How long does the whole project take?
- Allow six to twelve months for design and approvals, then ten to fourteen months on site for a typical four-bedroom new build. Complex sites or long planning routes extend that. In Trewoon specifically, we'd start by checking the latest parish-level planning history before committing to a direction.
- What about utilities, drainage and access?
- All designed and applied for as part of the package — water, electric, off-mains drainage where mains isn't viable, and highways access agreement with Cornwall Council where required.
- What's a replacement dwelling and is mine eligible?
- If a habitable dwelling exists on the plot, you can often replace it — within volumetric and design constraints set by Cornwall's Local Plan. Derelict structures sometimes qualify, sometimes don't, depending on lawful use history.
- Can you handle a self-build for me?
- Yes — from feasibility to handover. Many of our clients start as 'self-builders' on paper, then hand the actual build to us once they realise how much project management it takes.
- How much does a new build cost?
- Realistic budgets in Cornwall start around £2,800 per square metre for a good-quality build and rise quickly with bespoke joinery, large glazing, complex sites and high-spec finishes. We work to your number, not against it.
- We live in the house. Can a new build in Trewoon 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 Trewoon are often easier if you move out for a few weeks. We set that expectation at feasibility stage rather than halfway through.
Trewoon is part of St Austell
Trewoon sits inside the St Austell catchment — we cover both as one new build territory.
See New Builds in St Austell →Keep reading
Where to go next from Trewoon
Trewoon is covered from our St Austell 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 Trewoon
Nearby places we cover
Every Trewoon new build we work on is treated as a PL25 job in its own right — local fabric, local policy, local builders. Parish-level consultation in Trewoon is worth planning for, not reacting to.
Get a feasibility view on your Trewoon home Bring the deeds, we will bring the survey kit for the new build.
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