Mid Cornwall · TR1 · Cornwall Council Central
Passivhaus architect in Truro — low-energy homes done properly
Passivhaus in Truro is not a marketing sticker — it's a numbers-driven design method that requires orientation modelling, air-tightness planning and MVHR sizing from the first sketch. On rural plots in TR1, the shading from mature trees is the first variable we test in PHPP. 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. Truro sits in Mid Cornwall, and that geography ends up in the drawings — Truro is Cornwall's only city, the county town and home to Cornwall Council itself, with a Georgian core, three-spired cathedral and Lemon Quay at its centre, with a building stock that leans toward Edwardian villas and modern development at West Langarth.
Truro sits in Mid Cornwall — just off the A390; covering TR1 from Threemilestone, Shortlanesend, Kea outward.
- Conservation Area
- ✓ Full PHPP modelling available
- ✓ MVHR sizing and air-tightness planning
- ✓ 8–15% build premium, ~zero running cost
- ✓ Cost: £3,600–£4,800/m² built
Local watch-list
Truro-specific issues we screen on the first visit.
Watch #1
Cathedral views safeguarded across central wards
Watch #2
Steep slopes around Lemon Street complicating basement and lower-ground options
Watch #3
Article 4 in the central Conservation Area
Watch #4
Flood Zone catchment along the river corridor
Who this is for
In Truro the new build 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 context
Why Truro is its own job.
In Truro the planning picture is specific: the Truro Conservation Area covers a wide central zone including Lemon Street, the cathedral precinct and the river frontage. As the home of Cornwall Council planning, it tends to set the tone for design expectations across the county. For new build specifically, parts of Truro sit within a designated Conservation Area, which means materials, fenestration and roof pitches all need to read sympathetically with the existing streetscape. That local reading is what makes a Truro (TR1) project different from a generic Cornwall scheme — and is the whole reason we work this way. On Edwardian villas in particular — the kind you'll also find toward Perranwell Station — 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.
What we focus on
New Builds considerations specific to Truro.
01
Self-build CIL exemption requires the right documentation in the right order; missing a step costs five-figure sums.
02
Cornwall's housing policy increasingly favours principal residence and replacement dwelling schemes over open-market new builds in some parishes.
03
AONB and Heritage Coast designations apply to large stretches of the county; isolated new builds outside settlement boundaries face a much higher policy bar.
04
Off-grid services — package treatment plants, borehole supply, off-mains gas — are common on rural Cornish plots and need designing, not assuming.
Recent work nearby
Recent professional-services HQ retrofit on Lemon Street ran as a Conservation Area application with internal-only listed sign-off.
See more recent Mid Cornwall work →Our process
How a Truro 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
Truro New Builds — local questions answered.
- Is Passivhaus worth it in Truro?
- Financially, the 8–15% build premium pays back in 15–20 years at current energy prices. Comfort-wise, the payback is immediate. On new-builds in TR1, we recommend it on any plot with reasonable orientation.
- Do you produce full PHPP models?
- Yes, or we work alongside a certified PHPP consultant. Either route lands the same result — a fully modelled, air-tightness-tested certified Passivhaus.
- What's the cost difference vs a standard new build?
- £3,600–£4,800/m² for Passivhaus vs £3,000–£4,000/m² for a well-insulated standard build. Premium is smaller than most people expect.
- 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. In Truro specifically, we'd start by checking the Conservation Area boundary before committing to a direction.
- 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.
- 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.
Truro is the hub for these neighbourhoods
We run new builds across Truro and the surrounding TR1 neighbourhoods — same studio, same site team.
- Threemilestone
TR3
- Shortlanesend
TR4
- Playing Place
TR3
- Tresillian
TR2
- St Michael Penkivel
TR2
- Calenick
TR1
- Malpas
TR1
- Kea
TR3
- Kenwyn
TR1
Local proof — Our Mid Cornwall workload means a Truro new build project never has to wait for an out-of-county team to drive down.
Get a free feasibility viewOther services in Truro
Nearby places we cover
A Truro Passivhaus costs 8–15% more to build and roughly nothing to run — the payback is in comfort as much as bills, and the resale market for certified homes is strengthening year on year.
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