South Cornwall · TR11 · Cornwall Council Central
Mawnan loft conversion — feasibility first, drawings second
A well-designed loft conversion adds a bedroom, an en-suite and useful storage to homes that were never built with the upper floor in mind — usually inside permitted development and almost always cheaper per square metre than extending sideways. In Mawnan, that work is shaped by the place itself — Mawnan is a rural parish in the TR11 area, with farmsteads, lanes and scattered homes defining its built character, with a building stock that leans toward converted barns and scattered modern homes.
Mawnan sits in South Cornwall — just off the A39; covering TR11 from Mawnan Smith, Durgan, Truro outward.
- Cornwall AONB
- Rural / open-countryside policy area
- ✓AONB experience built into the fee
- ✓Cornwall Council Central sub-area regulars
- ✓Free first site visit, no obligation
- ✓Plain-English feasibility before any drawings
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Free Mawnan feasibility call
Tell us about your loft conversion. We reply within 1 working day — no obligation.
Who this is for
In Mawnan the loft conversion 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 watch-list
Local snags worth knowing before drawing a Mawnan loft conversion.
Watch #1
AONB landscape-impact testing on anything read in long views across South Cornwall
Watch #2
Local Plan tests on isolated dwellings, plus lane access for plant and deliveries around Mawnan
Local proof — Most Mawnan homeowners come to us after a loft conversion quote elsewhere felt vague on planning — we lead with feasibility instead.
Get a free feasibility viewFAQs
Mawnan Loft Conversions — local questions answered.
- We live in the house. Can a loft conversion in Mawnan 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 Mawnan are often easier if you move out for a few weeks. We set that expectation at feasibility stage rather than halfway through.
- Do I need planning permission for a loft conversion?
- Often no — most loft conversions sit inside permitted development on a typical Cornish house. Conservation Areas, AONB and properties on principal elevations need full planning, and we'll confirm at first review. In Mawnan specifically, we'd start by checking AONB landscape sensitivity before committing to a direction.
- How much does a loft conversion cost?
- A simple Velux conversion starts around £30,000 in Cornwall; a rear dormer with en-suite typically runs £45,000 to £65,000; hip-to-gable and mansards more. Stair location and bathroom complexity drive most of the cost.
- How long does a loft conversion take?
- Allow six to ten weeks on site for a Velux conversion, eight to fourteen weeks for a dormer, twelve to eighteen weeks for hip-to-gable. Add four to eight weeks for design and regs beforehand.
- Will it add value?
- An extra bedroom and bathroom typically adds noticeably more value than the build cost in most Cornish markets — but the value matters less than the daily use you'll get from the space.
- Will I have enough headroom?
- We need a minimum 2.2 metres ridge-to-joist before alterations to make a usable conversion straightforward. Less than that and we'd consider raising the ridge, which is a planning conversation, not a permitted development one.
Quick check
Want a straight answer on whether your Mawnan 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 Mawnan and the TR11 area.
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 loft conversion 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.
- Applications for Mawnan 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.
Keep reading
Follow the chain: survey, drawings, build
Mawnan is covered from our Mawnan Smith 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.
Page purpose
Drawings only, or drawings through to handover in Mawnan?
Both routes are open on a TR11 project, and the honest answer depends on whether you already have a builder you trust. Plenty of Mawnan 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 TR11 scope, not as one opaque figure
Scope
What we can draw, survey and build around Mawnan
These stages can be bought separately. Most TR11 projects use three of them.
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.
Structural coordination
Calculations coordinated with the drawings so building control sees one consistent story.
Local context
Why Mawnan is its own job.
Locally, open-countryside policy, access lanes, drainage and agricultural building history all need to be addressed before drawings go too far. For loft conversion specifically, 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; 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. Which is why we scope Mawnan projects parish-up, not template-down — the TR11 context shapes the design from day one. Whether the project is on converted barns in the centre or further out toward Mawnan Smith, the loft conversion response is locally tuned.
Planning note
Most Cornish loft conversions are permitted development — but a Certificate of Lawfulness is worth the extra week and small fee for resale protection.
What we focus on
Loft Conversions considerations specific to Mawnan.
01
Cut-roof Cornish properties are easier to convert than modern trussed roofs; the structural strategy varies completely.
02
Building regs require minimum 2.0 metre headroom over the stairs and 30-minute fire protection on the existing stair enclosure — both shape the design.
03
Cornish slate roofs come in a huge range of pitches — anything below a 30° pitch struggles to give usable headroom without raising the ridge.
04
Stairs eat space — a loft conversion lives or dies by where the new staircase lands and what it costs you on the floor below.
Our process
How a Mawnan loft conversion project runs.
Step 1
Feasibility
Roof, headroom, stair landing and structural assessment.
Step 2
Design
Layout options that respect the staircase, headroom and bathroom positioning.
Step 3
Approvals
Planning or permitted development confirmation, plus building regs.
Step 4
Build
Sequenced to keep the family living downstairs throughout most of the work.
Step 5
Handover
Finish, snag, certify, hand over the keys.
Loft conversions typically run six to eighteen weeks on site depending on type, with four to eight weeks of design and approvals beforehand.
Local fabric
Why Mawnan homeowners pick a local studio for loft conversion.
Building stock
Across Mawnan (TR11) we work on farmhouses, converted barns, rural cottages, smallholdings, scattered modern homes. Each stock type drives a different loft conversion response — converted barns in particular needs careful detailing here.
Parish & policy
Mawnan sits in the parish of Mawnan, which matters for how parish-level consultation lands on a loft conversion application.
Coverage
We cover TR11 from our studio, with regular loft conversion jobs also running in Mawnan Smith, Durgan, Truro. Most Mawnan site visits get booked within the same week.
What does a first Mawnan consultation cost?
Nothing. We come to the property, walk the site, talk through what works on a TR11 plot and follow up with a written feasibility note inside a week — no obligation either way.
Request a free visitMawnan is part of Mawnan Smith
Mawnan sits inside the Mawnan Smith catchment — we cover both as one loft conversion territory.
See Loft Conversions in Mawnan Smith →Other services in Mawnan
Nearby places we cover
The TR11 stretch of South Cornwall has its own rhythm; our loft conversion work respects it, and Cornwall Council usually responds in kind. For the final position on any address, Cornwall Council or the Planning Portal is the place to confirm it.
Start a Mawnan project with us We know how farmhouses behave here.
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