Mid Cornwall · PL24
Extensions Par: PL24 planning, Mid Cornwall fabric
Extensions are the bread and butter of Cornish homes — adding the kitchen-diner the original layout never had, the bedroom for a growing family, or the light and views the back of the house should always have had. A PL24 site visit comes before a Par sketch, every time — Par is a small industrial settlement in the PL24 catchment, shaped by historic works, transport links and everyday village housing, with a building stock that leans toward post-war houses and former industrial buildings.
Par sits in Mid Cornwall — covering PL24 from St Austell, Bugle, St Dennis outward.
- Coastal exposure zone
- ✓ coastal exposure experience built into the fee
- ✓ Free first site visit, no obligation
- ✓ Local to Mid Cornwall — not a national franchise
- ✓ Same team on paper as on site
Local proof — We typically have one or two extension jobs live in the PL24 area at any time, so the local planning officers know our drawings on sight.
Get a free feasibility viewLocal context
Why Par is its own job.
Old industrial plots, heritage remnants and mixed residential edges mean design statements need to explain scale, access and materials clearly. That sets the scene before any design work begins. For extension specifically, coastal salt-laden air around Par drives detailing choices — fixings, render systems and timber treatments all need to be specified for exposure. It's the kind of detail that decides whether a Par application gets approved at eight weeks or stalls in committee. The post-war houses that dominate Par (and continue out toward St Dennis) set the tone for any extension scheme here.
Planning note
Most extensions in Cornwall are either permitted development or a straightforward householder application — but Conservation Area and AONB sites need a more careful design conversation upfront.
What we focus on
Extensions considerations specific to Par.
01
Extensions over a certain proportion of the original house trigger full Part L upgrade obligations to the existing building — worth knowing before brief is set.
02
Wind and sea-spray exposure can drive material choices on west-facing extensions; we detail accordingly.
03
Permitted development for rear extensions runs to four metres on a detached house, three on a semi or terrace — but Article 4 areas remove this in some parishes.
04
Cornish granite and slate-hung walls react differently to new openings than modern brickwork — lintel choice and structural sequencing matter.
Our process
How a Par extension project runs.
Step 1
Brief
We meet on site, talk through how you live now and what's missing from the current layout.
Step 2
Design
Two or three sketch directions with rough budgets, then refinement of the chosen route.
Step 3
Approvals
Planning or Cert of Lawfulness, then a full building regs package.
Step 4
Build
Either through your own builder with our drawings, or as a full build by our team.
Step 5
Handover
Snag, certify, hand over the keys to your new space.
Typical single-storey rear extensions run twelve to twenty weeks on site; two-storey and wraparound projects sixteen to thirty weeks.
Local fabric
Why a Mid Cornwall studio is the right fit for Par extension.
Building stock
Across Par (PL24) we work on workers cottages, stone terraces, former industrial buildings, post-war houses, small infill plots. Each stock type drives a different extension response — post-war houses in particular needs careful detailing here.
Parish & policy
Par sits in the parish of Par, which matters for how parish-level consultation lands on a extension application.
Coverage
We cover PL24 from our studio, with regular extension jobs also running in St Austell, Bugle, St Dennis. Most Par site visits get booked within the same week.
How quickly can you visit a Par site?
Usually within the same week. Par (PL24) is on our regular Mid Cornwall run, alongside St Austell, Bugle, St Dennis. First visits are free and you'll get an honest feasibility view inside seven days.
Request a free visitFAQs
Par Extensions — local questions answered.
- How long does the whole process take?
- Allow roughly three months for design and approvals, then twelve to twenty weeks on site for a typical single-storey extension. Wraparounds and two-storey add-ons take longer, mostly through approval and groundworks. In Par specifically, we'd start by checking the latest parish-level planning history before committing to a direction.
- Do I need planning permission for an extension?
- Often no — single-storey rear extensions, side extensions and modest two-storey additions can sit inside permitted development on a typical detached house. Conservation Areas, AONB and Article 4 zones remove some of those rights, so we always check the address first.
- What about the Party Wall Act?
- If you share a wall with a neighbour or build close to a boundary, the Act applies. We flag it early, recommend a surveyor and keep the programme aligned with the notice period.
- How much does an extension cost in Cornwall?
- Build costs in Cornwall typically run from around £2,200 to £3,200 per square metre for a good-quality single-storey extension, more for kitchen-grade fit-out or complex glazing. We give a realistic budget before drawings start, not after.
- Will my house be liveable during the build?
- For most rear and side extensions, yes — we sequence the works so the kitchen and one bathroom stay functional until the new build is watertight and connected.
Par is part of St Austell
Par sits inside the St Austell catchment — we cover both as one extension territory.
See Extensions in St Austell →Other services in Par
Nearby places we cover
Most Par extension enquiries start with one honest conversation about what's actually allowed — and that conversation costs nothing.