Lizard Peninsula · TR12 · Cornwall Council West
Planning permission versus building regulations in Mullion, explained plainly
These two get mixed up constantly, and the confusion costs people money. Planning permission is about whether a proposal is acceptable in its setting: its size, its appearance, its effect on neighbours and on the character of Mullion. Building regulations are about the construction itself: structure, fire safety, insulation, ventilation, drainage and access. You can have one without the other, and plenty of Mullion projects need both. Building regulation drawings in Cornwall, drawn properly. Approved planning gets you permission to build — a complete building regs package is what gets you a building you can actually live in: 1:50 plans, 1:10 details, structural coordination and a specification a Cornish builder can price and build from without guesswork. A Mullion brief starts on the street, not the screen — Mullion is the largest village on the Lizard Peninsula, AONB-designated, with a fifteenth-century church, a working cove and the highest concentration of period housing on the peninsula, with a building stock that leans toward Edwardian guesthouses and modern AONB-sensitive replacement dwellings.
Mullion sits in Lizard Peninsula — just off the A394; covering TR12 from Mawgan, Ruan Minor, The Lizard outward.
- Conservation Area
- Cornwall AONB
- Coastal exposure zone
- Rural / open-countryside policy area
- ✓Both consents mapped for your project before work starts
- ✓Planning drawings and technical drawings prepared by the same studio
- ✓Structural input coordinated rather than bolted on
- ✓Mullion projects taken through from application to sign off
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Free Mullion feasibility call
Tell us about your building regulations package. We reply within 1 working day — no obligation.
Who this is for
In Mullion the building regulations package 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
Common Mullion pitfalls we plan around.
Watch #1
Conservation Area controls on materials, window proportions and roof form through central Mullion
Watch #2
AONB landscape-impact testing on anything read in long views across Lizard Peninsula
Watch #3
Exposure detailing on granite cottages around the church — fixings, render systems and joinery specified for salt-laden air
Watch #4
Local Plan tests on isolated dwellings, plus lane access for plant and deliveries around Mullion
Local proof — Most Mullion homeowners come to us after a building regulations package quote elsewhere felt vague on planning — we lead with feasibility instead.
Get a free feasibility viewFAQs
Mullion Building Regs — local questions answered.
- Can I have planning permission but fail building regulations?
- Yes, and it happens. A scheme can be perfectly acceptable in planning terms and still need reworking to satisfy structure, insulation or escape requirements. That is why the technical drawings come after the planning drawings.
- Which comes first?
- Usually planning, because the approved scheme sets the shape the technical package then has to make work. On permitted development projects there is no planning stage, so the building regulation package is the whole job.
- Do both need separate drawings?
- Yes. Planning drawings are about form and context and are typically at 1:100 and 1:50. Building regulation drawings are about construction and go down to 1:10 or finer at the junctions.
- Who decides each one in Mullion?
- Planning is determined by the local planning authority. Building regulations are assessed by a building control body, which may be the local authority team or an approved inspector. They are separate processes with separate fees and timescales.
- Who do you submit to in Mullion?
- Either Cornwall Council building control or one of the Approved Inspectors active in the county. We're happy to recommend, but the choice is yours. In Mullion specifically, we'd start by checking the Conservation Area boundary before committing to a direction.
- What happens if something changes on site?
- Site queries are part of the job. We respond directly to the builder during construction, issue revised details where needed and keep building control informed if the change is material.
- Can the builder work without building regs drawings?
- They can — and many do — but the cost gets recovered later in variations, mistakes and slower building control sign-off. A proper regs pack typically pays for itself several times over on anything beyond the smallest job.
Quick check
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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 Mullion and the TR12 area.
Scope
The parts of the job we can take on in Mullion
Clients in Mullion take different slices of this list, and that is deliberate.
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.
Planning application drawings
Existing and proposed plans, elevations, site and block plans drawn to validation standard.
Construction and technical drawings
1:10 and 1:20 details for the parts of the job builders normally have to guess at.
Measured survey
An accurate record of what is actually there, which is where most avoidable cost is removed.
Who this is for
What we can genuinely back up in Mullion
- Design and build are offered from the same studio, which means the person answering your Mullion questions has seen the detail built.
- Drawings, planning and building regulations are all produced in-house, so a building regulations package 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.
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
Other work we do around Mullion
We cover Mullion and the wider TR12 district directly. Building Regs enquiries here are common enough that we know the constraints before the first visit.
Page purpose
What you actually get on a Mullion building regulations package drawings package
This is a drawings-led service. You are buying a documented, submission-ready set for a TR12 address, not a build contract. For most Mullion householders that means a measured survey, an honest feasibility view, then the drawings the council and your builder both need.
- Measured survey and existing drawings before any proposal is drawn
- A written planning route for the TR12 address, including whether permitted development is realistically available
- Proposed plans, elevations and site plan at the scales the authority expects
- Submission and validation handling, plus responses to officer queries
Local context
Why Mullion is its own job.
Around Mullion (TR12), mullion Conservation Area covers the village centre; the wider parish is entirely within the AONB and includes Heritage Coast designation. Cliff-edge and coastal margin sites face the strictest controls in West Cornwall. For building regulations package specifically, parts of Mullion sit within a designated Conservation Area, which means materials, fenestration and roof pitches all need to read sympathetically with the existing streetscape; 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 Mullion drives detailing choices — fixings, render systems and timber treatments all need to be specified for exposure; 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. Reading Mullion properly up front saves more time than any drawing tool ever will. Most of our building regulations package work in Mullion lands on Edwardian guesthouses, with detailing that has to nod to the wider The Lizard streetscape. Where a property sits inside a conservation area or is listed, the assessment tends to turn on materials, window detailing and how visible the change is from the street rather than floor area alone. Cornwall Council's conservation team, or the Planning Portal, is the right place to confirm what applies to a specific address. Salt air and prevailing wind change specification long before they change planning. We tend to draw weathering details in full, then check whether coastal or AONB policy narrows the design options for this address.
Planning note
Building regulations are a separate consent track from planning. Drawing them properly upfront is the cheapest insurance you'll buy on the project.
What we focus on
Building Regs considerations specific to Mullion.
01
Granite walls, traditional cob, slate-hung elevations and rubble construction all need different building regs detailing than standard masonry.
02
Approved Inspectors and Cornwall Council building control both work in the county; choice of inspector affects how queries are handled.
03
Cornish exposure ratings are among the worst in the country; wind-driven rain detailing matters more here than in most of the UK.
04
Part L and the Future Homes Standard route now drives a meaningful share of the build cost; getting the U-values and air-tightness strategy right at design stage saves money on site.
Our process
How a Mullion building regulations package project runs.
Step 1
Design freeze
We confirm the planning-approved scheme as the basis for technical design.
Step 2
Structural coordination
Engineer's input on foundations, beams, lintels and steelwork is integrated into the drawings.
Step 3
Detailing
Construction details drawn at 1:10 for every junction that matters.
Step 4
Specification
Materials, U-values, finishes and workmanship written up so the builder can price accurately.
Step 5
Submission
Full Plans submission to building control with fee handling and query response through to completion certificate.
Most regs packages take three to six weeks once planning is approved, depending on structural complexity and engineer turnaround.
Local fabric
One TR12 studio, one building regulations package job — start to finish.
Building stock
Across Mullion (TR12) we work on granite cottages around the church, Edwardian guesthouses, 1960s coastal bungalows, modern AONB-sensitive replacement dwellings. Each stock type drives a different building regulations package response — Edwardian guesthouses in particular needs careful detailing here.
Parish & policy
Mullion is its own town in Lizard Peninsula, with planning history that's specific to the TR12 catchment.
Coverage
We cover TR12 from our studio, with regular building regulations package jobs also running in Helston. Most Mullion site visits get booked within the same week.
Do you work in Mullion regularly?
Yes — Mullion and the wider TR12 catchment are core territory. We're typically on a Lizard Peninsula site at least once a week, so logistics are baked in, not bolted on.
Request a free visitOther services in Mullion
Nearby places we cover
The simplest way to hold it in your head: planning asks whether you may build it, building regulations ask whether you built it properly. Different applications, different drawings, different people assessing them.
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