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Devon & Cornwall · Local Builders' Guide

Finding a Reliable Builder & Cornwall — A Practical Guide

Whether you're planning an extension, a full renovation or a new build, this guide covers the things worth knowing before you start — planning rules, building regulations, how building work is priced and how to choose a builder you can trust. Written by Clifford Building Contractors, local builders based covering a 30-mile radius in Devon and Cornwall.

Quick Answers

The most common questions — answered directly

How much does a house extension cost?

Extension cost varies significantly with size, specification, ground conditions, structural steelwork and access. We don't publish per-square-metre rates because they tend to mislead — every project gets a detailed written quote rather than a stock figure. Always compare written quotes on a like-for-like basis.

Do I need planning permission for an extension?

Single storey rear extensions up to 4 m from the rear wall (detached house) or 3 m (semi or terrace) are usually permitted development — no planning application needed. Double storey extensions always need full planning permission. Properties in AONBs such as Dartmoor, Exmoor and the North Devon Coast face extra restrictions beyond the standard rules.

How long does a house extension take?

Extensions vary in length depending on size, footprint, complexity, foundations, weather and access. If a planning application is required, there is also a pre-construction wait while the application is determined. A realistic programme should form part of any written quote.

How do I find a reliable builder or North Devon?

Ask for proof of public liability insurance, get two or three written quotes rather than verbal estimates, ask for local references you can actually speak to, and confirm the builder will handle building regulations sign-off rather than leaving it with you. A builder based locally knows the ground conditions, the planning offices and the local trades — and is much easier to hold accountable if anything needs sorting.

Full guide to building work in Devon and Cornwall

What building work can I do without planning permission?

Permitted development (PD) rights allow a range of building work without the need for a formal planning application. For a standard dwelling, a single storey rear extension that does not exceed 4 metres from the original rear wall (detached house) or 3 metres (semi-detached or terraced) is usually permitted development. Larger extensions — up to 8 m (detached) or 6 m (attached) — may be possible under the Prior Approval process but require an application to the local planning authority.

Double storey extensions always require full planning permission, regardless of size. There is also a general rule that extensions must not cover more than 50% of the curtilage (the land around the original house, excluding the footprint of the house itself).

Loft conversions using Velux-style rooflights are typically permitted development on any roof slope. Rear dormers are usually also PD, but front dormers require full planning in most cases. Like-for-like roof replacements do not require planning permission or building regulations approval (though a new roof structure does need building regs).

Properties within Dartmoor National Park are managed by the Dartmoor National Park Authority (DNPA) — a separate planning body with significantly stricter controls. Properties in the North Devon Coast AONB, Cornwall AONB areas or a conservation area have reduced PD rights. Torridge District Council (which covers Holsworthy), West Devon Borough Council in Devon and Cornwall Council all have their own guidance online, and pre-application advice is available from each.

As part of a free site visit we can talk through whether your project looks like permitted development or whether a full application is likely to be needed — no fee, no obligation.

How is building work priced in Devon and Cornwall?

Building work is priced per project, not per square metre. Headline rates and stock price lists rarely match the job in front of you — the same nominal extension can vary hugely once you account for foundations, ground conditions, structural steelwork, drainage runs, access, specification, materials and finish.

A useful quote breaks the work down into the things that actually drive the price: the structure, the envelope, the services, the finishes, the external works and any specialist trades. That itemised structure is what lets you compare one builder's quote against another on a like-for-like basis, and it lets you make informed decisions when something needs to flex up or down.

We don't publish a rate card. Every project gets a free site visit and a detailed written quote — that is the only figure that means anything for your job.

Do I need building regulations approval?

Building regulations approval is required for the vast majority of significant building work — and it is separate from planning permission. While planning permission says whether you can build something, building regulations set the standards for how it must be built. Both may be required; one may be required without the other.

Work that almost always requires building regs approval includes: structural alterations and extensions, loft conversions, new roof structures (not like-for-like replacement), electrical installations (Part P), plumbing and drainage work, boiler replacements, and insulation upgrades. Even a project that is permitted development still requires building regulations sign-off.

The completion certificate issued at the end of the process is not just a formality — it is a critical document when you come to sell your property. Solicitors and mortgage lenders routinely ask for it. If work was done without approval and no certificate exists, you may have to apply for a regularisation certificate retrospectively, which can be time-consuming and expensive.

We handle building regulations applications and coordinate inspections as a standard part of every eligible job, and we make sure the completion certificate is in your hands before we close out the project.

What should I look for when hiring a builder?

Getting the right builder is more important than getting the cheapest quote. Here is what to check before you sign anything:

  • Get a written quote, not a verbal estimate. It should break down the scope of work and materials clearly so you can compare it with other quotes on a like-for-like basis.
  • Ask for a copy of their public liability insurance certificate and employer's liability insurance. Any established builder will provide this without hesitation.
  • Confirm they will obtain building regulations approval and coordinate inspections — or explain clearly if it falls outside their scope. You should not be left to sort this yourself.
  • Ask how they handle unexpected findings — for example, discovering rot, poor existing foundations or hidden drainage when they open up. The answer tells you a lot about how the job will be run.
  • A builder based locally is easier to hold accountable. They have a local reputation to protect and they know the ground conditions, the planning offices and the local supply chain.
  • Avoid paying large deposits upfront. A stage payment schedule tied to genuine progress on site protects both parties.
  • Ask for references from previous local clients — and actually speak to them.

At Clifford Building Contractors, we provide written quotes, full insurance documentation, handle building regulations as standard, and are happy to give you references from local clients. We are based and our name is on every job we do.

How long does building work typically take?

Every project is different. The honest answer to "how long" is that a realistic programme depends on the size of the job, the foundations, the structural work, the weather, the access and the lead times on materials and specialist trades. A useful written quote includes an indicative programme broken down by stage — that is the figure to ask for, rather than a generic week count.

There are a few things specific to Devon and Cornwall that can affect timescales. Material deliveries to rural villages and Hatherleigh occasionally take longer to arrange than a town-centre site. Specialist trades — steelwork, bespoke joinery, certain roofing materials — can have longer lead times in the South West than in a major city. Building control inspections need to be booked at various stages and slot into the programme. For roofing and groundworks, the winter months (October to March) are a real factor that has to be planned around.

If planning permission is required, there is also a pre-construction wait while the application is determined before any work can start on site. We'll set that out clearly as part of the programme in your written quote.

What are the planning considerations specific to Devon and Cornwall?

Devon and Cornwall have a more complex planning landscape than most parts of England — largely because of the number of designated areas and the way planning authority is divided across multiple bodies.

Dartmoor National Park is managed by the Dartmoor National Park Authority (DNPA), which is a separate planning authority from any district or borough council. DNPA applies significantly stricter controls than the standard national planning rules — smaller extensions, tighter material requirements, and in some cases no permitted development rights at all. If your property is within the National Park boundary, you must apply to DNPA, not Torridge or West Devon.

Areas of Outstanding Natural Beauty include the North Devon Coast AONB (covering the coast from Bude up through Hartland and Westward Ho!) and various Cornwall AONB areas. Permitted development rights are reduced in AONBs, particularly for extensions and outbuildings.

Conservation areas in town centres — including parts of Launceston town centre and Okehampton — impose additional controls on external appearance, materials and demolition. Listed buildings require Listed Building Consent for any works that affect their character, internally or externally, and the requirements go well beyond standard planning rules.

The key planning authorities in our patch are: Torridge District Council (Holsworthy, Hatherleigh), West Devon Borough Council (Okehampton, Tavistock), Cornwall Council (Launceston, Stratton) and Dartmoor National Park Authority. All offer pre-application planning advice — a useful and often underused tool that can save you significant time and money before you commit to an application.

Frequently Asked Questions

More questions, answered straight

Your Local Builder

About Clifford Building Contractors

We are a team of local builders based in Holsworthy, Devon, covering a 30-mile radius in Devon and Cornwall. We take on extensions, renovations, new builds, loft conversions, structural work, roofing, kitchens, bathrooms and groundworks — handling every stage of the build under one roof.

We are plain-spoken, reliable and do things properly. Every job gets a written quote, full insurance documentation and one team from start to finish. If something unexpected comes up on site, we talk it through with you before any additional work goes ahead.

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07828 212499cliffordbuildingcontractors@gmail.com
Based in Holsworthy, Devon — covering Holsworthy and beyond

Ready to talk about your project?

Tell us what you have in mind — an extension, renovation, new build or anything else — and we will give you honest advice and a free, no-obligation written quote. No pressure, no disappearing act.

  • Written quote once the job has been properly scoped
  • No fee for site visits
  • Advice on planning & building regs included
  • One team from first chat to final handover