Do I need planning permission?

It's the first question most Bristol homeowners ask when they're thinking about an extension, renovation, or new build. And the honest answer is: it depends. But understanding the basics — quickly — saves you time, money, and headaches further down the line. Here's what you actually need to know.

When you do and don't need it

Not all building work requires planning permission. Many common projects are covered by what's called Permitted Development Rights (PDR) — a government scheme that pre-approves certain types of work, so you don't have to apply. I’ve written a separate, detailed blog about PDR, but here’s a short version

Things that often fall within Permitted Development and don't need full planning permission:

— Modest single-storey rear extensions (up to 4 metres deep on a detached house, 3 metres on a terrace)

— Loft conversions that don't significantly change the roofline

— Internal remodelling that doesn't affect the outside of the building

Things that usually do need planning permission:

— Larger or two-storey extensions

— Front extensions or side extensions that face the street

— Changes that affect the external appearance significantly

— New builds and outbuildings over certain sizes

If your property is in a conservation area — and Bristol has 38 of them — or if it's a listed building, the rules are stricter. You'll almost certainly need permission for work that would otherwise be permitted development elsewhere.

Conservation areas in Bristol include much of Clifton, Redland, Cotham, Stoke Bishop, and Westbury-on-Trym. If you're in one, assume you need permission and check before proceeding.

Who helps you get planning permission?

There are two types of professional who handle planning applications — and which one you need depends on the scale of your project.

An architect handles larger, more complex projects: new builds, significant extensions, listed buildings, anything that needs considered design thinking alongside the technical drawings. They design your project, produce the plans, and manage the application process.

An architectural technician (sometimes called a draughtsperson or architectural designer) handles smaller, more straightforward projects — a modest rear extension, a loft conversion, a garage conversion. They produce the drawings and submit the application, without the full design service an architect provides.

If you're not sure which you need, ask us. We regularly point customers in the right direction — towards an architect for bigger or more complex projects, towards a technician for smaller ones. It's a simple steer that saves you time and unnecessary cost.

What we don't do as builders is handle the planning application itself. But we work closely with whoever you appoint, review plans before they're submitted, and help navigate any queries that come up along the way.

Where do you actually apply?

Planning permission in Bristol is handled by Bristol City Council. If your property is in South Gloucestershire — for example Thornbury, Yate, Filton, or Emersons Green — it's South Gloucestershire Council instead.

Both councils use the national Planning Portal as the submission gateway. Your architect or technician/designer will typically manage the application through there on your behalf.

How long does it take?

Once submitted, the standard target for a decision is eight weeks. In practice, for straightforward applications, Bristol City Council and South Gloucestershire Council both generally aim to meet that. SGC is generally excellent in meeting the eight to 10 weeks, BCC is getting better after experiencing recent years of poor performance). For more complex or sensitive applications — listed buildings, larger developments, contested proposals — the time period can stretch to 12 weeks or longer.

Add to that the time to prepare drawings and get the application ready before submission — typically four to eight weeks depending on your architect's availability — and a realistic total lead time from "let's start" to "permission granted" is three to five months for a standard project.

This is one reason we always say: start thinking about planning early. If you want work to begin in spring, conversations need to happen in autumn.

What form does planning permission actually take?

When permission is granted, you receive a formal decision notice from the council. It will confirm what has been approved, often with conditions attached — for example, that specific materials must be used, or that work must start within a certain period (usually 3 years).

You'll also receive the approved plans — the drawings that were submitted with the application — stamped and dated as approved. These are important documents. Keep them.

Do you need to keep approved plans for when you sell?

Yes — and this matters more than many homeowners realise.

When you sell your home, your solicitor will ask for evidence that any building work was properly approved. That means your planning permission decision notice, your approved drawings, and your Building Regulations completion certificate (which is a separate thing — more on that another time).

If you can't produce these, the sale can be delayed, the buyer's solicitor may request an indemnity insurance policy, or in the worst cases the sale can fall through.

Keep all planning and building approval documents with your property deeds. Scan them digitally as a backup. It's a simple thing that protects a significant investment.

One more thing: planning permission and Building Regulations are not the same

This trips up a lot of people. They're separate approvals for separate things.

Planning permission is about what you can build and where — it deals with design, appearance, and impact on the local area.

Building Regulations approval is about how you build — it ensures the structure is safe, energy-efficient, and properly constructed. See my blogpost about Building Regs.

You often need both. Getting planning permission doesn't mean your build is automatically compliant with Building Regulations. Your builder and architect will manage both, but it's worth understanding that they're two distinct processes.

Where to start

If you're unsure whether your project needs planning permission, the honest starting point is a conversation — either with an architect or with us. We can usually give you a quick steer based on your property type, location, and what you're hoping to do. And, because we’ve worked with many architects across the city, as well as architectural tehnicians, we can point you in the the direction of practices that fit your project.

Getting the right advice early is always cheaper than undoing something that shouldn't have been built.

Planning something for your Bristol home? Let's start with a conversation about what's possible.