East Cornwall · PL15
One studio for loft conversion in Altarnun
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. Altarnun sits in East Cornwall, and that geography ends up in the drawings — Altarnun is a moorland-edge hamlet in the PL15 area, where exposed weather, narrow lanes and rural character set the brief, with a building stock that leans toward small rural infill and farm buildings.
Altarnun sits in East Cornwall — covering PL15 from Launceston, Warbstow, North Petherwin outward.
- Conservation Area
- Rural / open-countryside policy area
- ✓ Local to East Cornwall — not a national franchise
- ✓ Same team on paper as on site
- ✓ 30+ years of Cornwall Council approvals
- ✓ Measured-survey accuracy from day one
Our process
How a Altarnun 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 proof — We typically have one or two loft conversion jobs live in the PL15 area at any time, so the local planning officers know our drawings on sight.
Get a free feasibility viewWhat we focus on
Loft Conversions considerations specific to Altarnun.
01
Cut-roof Cornish properties are easier to convert than modern trussed roofs; the structural strategy varies completely.
02
Stairs eat space — a loft conversion lives or dies by where the new staircase lands and what it costs you on the floor below.
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
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.
Local context
Why Altarnun is its own job.
Two things shape a Altarnun application: parish character and policy. On policy — rural policy, landscape impact and services such as drainage are usually the key constraints, especially outside settlement boundaries. For loft conversion specifically, parts of Altarnun sit within a designated Conservation Area, which means materials, fenestration and roof pitches all need to read sympathetically with the existing streetscape; 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. Get that local reading right and the rest of the Altarnun programme tends to run on time. On small rural infill in particular — the kind you'll also find toward Boyton — the loft conversion brief always has to read the existing fabric first.
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.
Local watch-list
Altarnun-specific issues we screen on the first visit.
Watch #1
Conservation Area material and fenestration controls in central Altarnun
Watch #2
Tighter Local Plan tests on isolated rural dwellings
Altarnun is part of Launceston
Altarnun sits inside the Launceston catchment — we cover both as one loft conversion territory.
See Loft Conversions in Launceston →Local fabric
Altarnun loft conversions — the local-studio difference.
Building stock
Across Altarnun (PL15) we work on stone cottages, farm buildings, isolated houses, converted barns, small rural infill. Each stock type drives a different loft conversion response — small rural infill in particular needs careful detailing here.
Parish & policy
Altarnun sits in the parish of Altarnun, which matters for how parish-level consultation lands on a loft conversion application.
Coverage
We cover PL15 from our studio, with regular loft conversion jobs also running in Launceston, Warbstow, North Petherwin. Most Altarnun site visits get booked within the same week.
Can you handle both planning and build in Altarnun?
Yes — design, planning, building regs and full construction run under one roof. For clients with an existing Altarnun builder we can stop at a tender-ready Full Plans pack instead.
Request a free visitWho this is for
Altarnun runs the full mix — owner-occupier, holiday-let, commercial and the occasional smallholding — so we scope every loft conversion enquiry from the use-class up.
FAQs
Altarnun Loft Conversions — local questions answered.
- 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. In Altarnun specifically, we'd start by checking the Conservation Area boundary before committing to a direction.
- 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.
- 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.
- 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.
Other services in Altarnun
Nearby places we cover
Every Altarnun loft conversion we work on is treated as a PL15 job in its own right — local fabric, local policy, local builders.