North Cornwall · PL28
Design, planning and build for Treyarnon 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. Every Treyarnon project we take on begins with reading the local context — Treyarnon is a holiday-coast settlement in the PL28 area, with strong second-home demand and exposed coastal building conditions, with a building stock that leans toward second homes and holiday lets.
Treyarnon sits in North Cornwall — covering PL28 from Padstow, St Eval, Trevone outward.
- Cornwall AONB
- Coastal exposure zone
- ✓ Plain-English feasibility before any drawings
- ✓ Local to North Cornwall — not a national franchise
- ✓ Same team on paper as on site
- ✓ Fixed-fee planning packages, no surprise invoices
Local proof — We typically have one or two loft conversion jobs live in the PL28 area at any time, so the local planning officers know our drawings on sight.
Get a free feasibility viewLocal context
Why Treyarnon is its own job.
Cornwall Council's lens on Treyarnon is consistent: planning scrutiny often focuses on visual impact, occupancy, parking, overlooking and whether replacement buildings respect the coastal edge. 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; coastal salt-laden air around Treyarnon drives detailing choices — fixings, render systems and timber treatments all need to be specified for exposure. That's why we treat every Treyarnon project as a PL28-area job first — not a generic Cornwall job with a postcode bolted on. The second homes that dominate Treyarnon (and continue out toward Trevone) 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 Treyarnon.
01
Cornish slate roofs come in a huge range of pitches — anything below a 30° pitch struggles to give usable headroom without raising the ridge.
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
Cut-roof Cornish properties are easier to convert than modern trussed roofs; the structural strategy varies completely.
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.
Our process
How a Treyarnon 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 Treyarnon homeowners pick a local studio for loft conversion.
Building stock
Across Treyarnon (PL28) we work on coastal bungalows, holiday lets, second homes, detached houses, replacement dwellings. Each stock type drives a different loft conversion response — second homes in particular needs careful detailing here.
Parish & policy
Treyarnon sits in the parish of Treyarnon, which matters for how parish-level consultation lands on a loft conversion application.
Coverage
We cover PL28 from our studio, with regular loft conversion jobs also running in Padstow, St Eval, Trevone. Most Treyarnon site visits get booked within the same week.
How quickly can you visit a Treyarnon site?
Usually within the same week. Treyarnon (PL28) is on our regular North Cornwall run, alongside Padstow, St Eval, Trevone. First visits are free and you'll get an honest feasibility view inside seven days.
Request a free visitFAQs
Treyarnon Loft Conversions — local questions answered.
- 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 Treyarnon specifically, we'd start by checking AONB landscape sensitivity before committing to a direction.
- 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.
- 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.
- 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.
- 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.
Treyarnon is part of Padstow
Treyarnon sits inside the Padstow catchment — we cover both as one loft conversion territory.
See Loft Conversions in Padstow →Other services in Treyarnon
Nearby places we cover
To sum up, our loft conversion approach in Treyarnon is built entirely around local Cornwall context, ensuring the best possible outcome for your property.