North Cornwall · TR5
Design, planning and build for Mithian Downs loft conversion
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. A TR5 site visit comes before a Mithian Downs sketch, every time — Mithian Downs is a small rural hamlet in the TR5 area, with scattered homes, lanes and a deliberately quiet settlement pattern, with a building stock that leans toward farmhouses and cottages.
Mithian Downs sits in North Cornwall — covering TR5 from St Agnes, Mount Hawke, Trevellas outward.
- Cornwall AONB
- Rural / open-countryside policy area
- ✓ Plain-English feasibility before any drawings
- ✓ Free first site visit, no obligation
- ✓ One studio — design, planning and build under one roof
- ✓ Local to North Cornwall — not a national franchise
Local proof — Most Mithian Downs loft conversion clients we work with are second-time builders — they've seen the templated approach fail once already.
Get a free feasibility viewLocal context
Why Mithian Downs is its own job.
Cornwall Council's lens on Mithian Downs is consistent: the main planning test is usually whether the proposal remains subordinate, locally detailed and acceptable on access, drainage and neighbour amenity. 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. That's why we treat every Mithian Downs project as a TR5-area job first — not a generic Cornwall job with a postcode bolted on. The farmhouses that dominate Mithian Downs (and continue out toward Trevellas) set the tone for any loft conversion scheme here.
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 Mithian Downs.
01
Stairs eat space — a loft conversion lives or dies by where the new staircase lands and what it costs you on the floor below.
02
Permitted development volume allowances are 40 cubic metres on a terrace and 50 on a detached or semi — but rear dormers in Conservation Areas often need full planning.
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
Cut-roof Cornish properties are easier to convert than modern trussed roofs; the structural strategy varies completely.
Our process
How a Mithian Downs 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 Mithian Downs homeowners pick a local studio for loft conversion.
Building stock
Across Mithian Downs (TR5) we work on cottages, farmhouses, converted barns, bungalows, small infill homes. Each stock type drives a different loft conversion response — farmhouses in particular needs careful detailing here.
Parish & policy
Mithian Downs sits in the parish of Mithian Downs, which matters for how parish-level consultation lands on a loft conversion application.
Coverage
We cover TR5 from our studio, with regular loft conversion jobs also running in St Agnes, Mount Hawke, Trevellas. Most Mithian Downs site visits get booked within the same week.
How quickly can you visit a Mithian Downs site?
Usually within the same week. Mithian Downs (TR5) is on our regular North Cornwall run, alongside St Agnes, Mount Hawke, Trevellas. First visits are free and you'll get an honest feasibility view inside seven days.
Request a free visitFAQs
Mithian Downs Loft Conversions — local questions answered.
- Can I live downstairs while it's built?
- Yes — most loft conversions are built with the family staying in the house. There'll be a couple of disruptive days when the staircase comes through, but the bulk of the work is upstairs. In Mithian Downs specifically, we'd start by checking AONB landscape sensitivity before committing to a direction.
- 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.
- 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.
- 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.
Mithian Downs is part of St Agnes
Mithian Downs sits inside the St Agnes catchment — we cover both as one loft conversion territory.
See Loft Conversions in St Agnes →Other services in Mithian Downs
Nearby places we cover
Most Mithian Downs loft conversion enquiries start with one honest conversation about what's actually allowed — and that conversation costs nothing.