East Cornwall · PL22
Eco new builds in Lostwithiel — sustainable spec that stacks up
An eco new-build in Lostwithiel doesn't have to be Passivhaus-certified to make sense. Timber-frame construction, wood-fibre insulation, triple glazing and a properly sized air-source heat pump get you 85–90% of Passivhaus performance for a build premium under 6%. On PL22 plots, this is the pragmatic middle ground. 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. A Lostwithiel brief starts on the street, not the screen — Lostwithiel is a medieval town on the river Fowey, formerly the capital of Cornwall, with a strong antiques trade, a Norman church and an extensive Conservation Area, with a building stock that leans toward post-war estates and medieval and Georgian merchants' houses.
Lostwithiel sits in East Cornwall — covering PL22 from Fowey, Lerryn outward.
- Conservation Area
- ✓ Timber-frame with wood-fibre insulation
- ✓ ASHP + underfloor + PV as standard
- ✓ Under 6% cost premium
- ✓ Full building regs sign-off included
Our process
How a Lostwithiel 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.
Local proof — Most Lostwithiel homeowners come to us after a new build quote elsewhere felt vague on planning — we lead with feasibility instead.
Get a free feasibility viewWhat we focus on
New Builds considerations specific to Lostwithiel.
01
Replacement dwellings have specific volumetric tests — getting the ratio between existing footprint and proposed floor area right is the difference between approval and refusal.
02
Self-build CIL exemption requires the right documentation in the right order; missing a step costs five-figure sums.
03
Off-grid services — package treatment plants, borehole supply, off-mains gas — are common on rural Cornish plots and need designing, not assuming.
04
AONB and Heritage Coast designations apply to large stretches of the county; isolated new builds outside settlement boundaries face a much higher policy bar.
Local context
Why Lostwithiel is its own job.
Around Lostwithiel (PL22), conservation Area is extensive, covering the medieval streets, the church and the riverside. Listed buildings are very common; flood zone designation affects properties near the river. For new build specifically, parts of Lostwithiel sit within a designated Conservation Area, which means materials, fenestration and roof pitches all need to read sympathetically with the existing streetscape. Reading Lostwithiel properly up front saves more time than any drawing tool ever will. Most of our new build work in Lostwithiel lands on post-war estates, with detailing that has to nod to the wider Lerryn streetscape.
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.
Local watch-list
Common Lostwithiel pitfalls we plan around.
Watch #1
Conservation Area material and fenestration controls in central Lostwithiel
Lostwithiel is the hub for these neighbourhoods
We run new builds across Lostwithiel and the surrounding PL22 neighbourhoods — same studio, same site team.
- Lerryn
PL22
- St Winnow
PL22
- Lanlivery
PL30
- Sweetshouse
PL24
- Redmoor
PL30
Local fabric
What sets a Lostwithiel new build brief apart.
Building stock
Across Lostwithiel (PL22) we work on medieval and Georgian merchants' houses, Victorian terraces, Edwardian villas, post-war estates, modern infill on tight town-edge plots. Each stock type drives a different new build response — post-war estates in particular needs careful detailing here.
Parish & policy
Lostwithiel is its own town in East Cornwall, with planning history that's specific to the PL22 catchment.
Coverage
We cover PL22 from our studio, with regular new build jobs also running in Fowey, Lerryn, Lanlivery. Most Lostwithiel site visits get booked within the same week.
Do you work in Lostwithiel regularly?
Yes — Lostwithiel and the wider PL22 catchment are core territory. We're typically on a East Cornwall site at least once a week, so logistics are baked in, not bolted on.
Request a free visitWho this is for
Lostwithiel runs the full mix — owner-occupier, holiday-let, commercial and the occasional smallholding — so we scope every new build enquiry from the use-class up.
FAQs
Lostwithiel New Builds — local questions answered.
- Is timber-frame or block best for eco in Lostwithiel?
- Timber-frame nearly every time — lower embodied carbon, faster on-site programme, better air-tightness detailing. The exception is exposed coastal plots where masonry may still win on maintenance.
- What eco heating works in Lostwithiel?
- Air-source heat pump with underfloor heating downstairs, radiators upstairs. Ground-source only makes sense on plots with borehole space. PV on the roof pays back in 9–12 years at current rates.
- Does eco spec add much cost?
- £3,200–£4,200/m² for sensible eco spec vs £3,000–£4,000 standard. Under 6% premium for major improvements in comfort and running cost.
- 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 Lostwithiel specifically, we'd start by checking the Conservation Area boundary 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.
Other services in Lostwithiel
Nearby places we cover
Local neighbourhoods in Lostwithiel
Not every Lostwithiel eco home needs full Passivhaus certification — sensibly specified timber-frame with the right envelope gets most of the benefit for a fraction of the premium.
Design an eco new-build on your Lostwithiel plot
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