Mid Cornwall · TR1 · Cornwall Council Central
Permitted development in Truro — what's allowed without planning
Most Truro homeowners have more PD rights than they realise — but the Conservation Area removes the big ones (rear extensions, side extensions, cladding changes). Below is what's typically allowed on a TR1 property — and what catches people out. We prepare and submit planning applications to Cornwall Council and, where relevant, the Isles of Scilly authority — handling drawings, statements, validation queries and officer negotiation from start to determination. In Truro, that work is shaped by the place itself — 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 Georgian townhouses on Lemon Street.
Truro sits in Mid Cornwall — just off the A390; covering TR1 from Threemilestone, Shortlanesend, Kea outward.
- Conservation Area
- ✓Rear extension up to 3m (terraced/semi) without planning
- ✓Loft volume up to 40m³ (terrace) under PD
- ✓Outbuildings up to 2.5m eaves height
- ✓Lawful Development Certificate from £100
Free · No obligation
Free Truro feasibility call
Tell us about your planning application. We reply within 1 working day — no obligation.
Page purpose
What you actually get on a Truro planning application drawings package
This is a drawings-led service. You are buying a documented, submission-ready set for a TR1 address, not a build contract. For most Truro householders that means a measured survey, an honest feasibility view, then the drawings the council and your builder both need.
- Measured survey and existing drawings before any proposal is drawn
- A written planning route for the TR1 address, including whether permitted development is realistically available
- Proposed plans, elevations and site plan at the scales the authority expects
- Submission and validation handling, plus responses to officer queries
Scope
What we can draw, survey and build around Truro
These stages can be bought separately. Most TR1 projects use three of them.
Construction and technical drawings
1:10 and 1:20 details for the parts of the job builders normally have to guess at.
Commercial drawings
Change of use, fit-out and access documentation for Class E and mixed-use premises.
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.
Local watch-list
Local snags worth knowing before drawing a Truro planning application.
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
Why this page exists, and who it is for
- Drawings, planning and building regulations are all produced in-house, so a planning application enquiry does not get passed between firms.
- 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 Cathedral and Lemon Street.
- Commercial and mixed-use work in Truro tends to sit around Threemilestone Industrial Estate.
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
Planning considerations specific to Truro.
01
Article 4 directions in some parishes remove permitted development rights you'd normally rely on elsewhere.
02
Cornwall's Local Plan policies on second homes, holiday lets and principal residence restrictions affect what's likely to gain consent in some parishes.
03
Tree Preservation Orders, ecology surveys and neighbour consultation responses can change the validation list mid-application.
04
Cornwall has more than thirty Conservation Areas and large stretches of AONB; planning weight on materials, mass and form is significantly higher in those zones.
Quick check
Want a straight answer on whether your Truro 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.
Free · No obligation
Get a free feasibility view
For projects in Truro and the TR1 area.
Local context
Why Truro is its own job.
Locally, 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 planning application 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. Which is why we scope Truro projects parish-up, not template-down — the TR1 context shapes the design from day one. Whether the project is on Edwardian villas in the centre or further out toward Threemilestone, the planning application response is locally tuned. Where a property sits inside a conservation area or is listed, the assessment tends to turn on materials, window detailing and how visible the change is from the street rather than floor area alone. Cornwall Council's conservation team, or the Planning Portal, is the right place to confirm what applies to a specific address.
Planning note
Cornwall Council's planning team is among the busiest in the South West. A clean, well-documented submission moves through validation faster than a bare-minimum one.
Recent work nearby
Newham unit we extended last year added a mezzanine without triggering full plans.
See more recent Mid Cornwall work →Our process
How a Truro planning application project runs.
Step 1
Initial review
We assess constraints — Conservation Area, AONB, listed status, Article 4, TPOs, flood zone.
Step 2
Strategy
We recommend the right application type and likely fee, programme and supporting documents.
Step 3
Drawing and statement preparation
Plans, elevations, sections, block and location plans, plus DAS and any heritage or ecology input.
Step 4
Submission and validation
We upload to the Planning Portal, pay the council fee on your behalf and respond to validation requests.
Step 5
Determination
We monitor consultation, respond to officer queries and negotiate amendments where it improves the chances of approval.
Householder applications are typically eight to twelve weeks from validation; full planning runs thirteen to sixteen weeks; major or contentious schemes can take longer.
FAQs
Truro Planning — local questions answered.
- What's permitted development in Truro?
- Single-storey rear extensions up to 3m (terraced/semi) or 4m (detached), loft conversions up to 40m³ (terrace) or 50m³ (semi/detached), and most outbuildings under 2.5m eaves. Conservation Area removes side extensions, cladding and roof extensions from PD.
- Do I need to apply for anything if it's PD?
- Legally no, but a Lawful Development Certificate (LDC) costs about £100 and gives Cornwall Council's confirmation in writing. We strongly recommend it for resale and for any neighbour disputes.
- What removes PD rights in Truro?
- Conservation Area designation, Article 4 directions, flats and maisonettes, and any deed restriction from a previous planning permission. We check all four before quoting.
- How much does a planning application cost in Truro?
- Cornwall Council charges a fixed national fee — currently £258 for a householder application and £578 for a single new dwelling. Our fee for the drawings, statements and submission sits separately and depends on project complexity. In Truro specifically, we'd start by checking the Conservation Area boundary before committing to a direction.
- Do you handle listed building consent?
- Yes. Listed Building Consent runs alongside planning where works affect a listed structure, including some interior alterations. The drawing detail and Heritage Statement are fundamentally different from a standard planning pack.
- We live in the house. Can a planning application in Truro 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 Truro are often easier if you move out for a few weeks. We set that expectation at feasibility stage rather than halfway through.
Keep reading
Follow the chain: survey, drawings, build
We cover Truro and the wider TR1 district directly. Planning enquiries here are common enough that we know the constraints before the first visit.
Other services in Truro
Nearby places we cover
A Lawful Development Certificate is cheap insurance on a Truro PD scheme — it pins down what's allowed before you build, and protects resale value.
Get a free PD check on your Truro property
Free · No obligation
Book a free visit in Truro
No obligation. Reply usually same working day.