Loft conversions are one of the most popular ways to add extra space and value to a home. Whether you're thinking of creating a master suite, a home office, or a cosy guest room, turning your loft into a liveable space can be a smart move.

But there's one big question homeowners often ask before they get started:

"Do I need planning permission for a loft conversion?"

The answer? It depends. In this article, we'll walk you through the typical scenarios and highlight what's common in and around Salisbury. This isn't legal advice, but it'll give you a good understanding of where you might stand.

When Planning Permission Usually Isn't Required

In many cases, you won't need to apply for planning permission because loft conversions often fall under what's known as "Permitted Development" (PD) rights.

Generally speaking, planning permission might not be needed if:

—Your new loft space doesn't exceed 40 cubic metres for a terraced house or 50 cubic metres for detached/semi-detached homes.
—The extension doesn't go beyond the existing roof slope on the front of the house.
—Any new roof additions like dormers don't exceed the height of the existing roof.
—Materials used are similar to those already on the house.
—Side-facing windows are obscure-glazed, and any openings are set at least 1.7m above floor level.

Important: Permitted development rights can vary depending on your property's history. If previous extensions or changes were made, your allowance might be reduced.

When You May Need Planning Permission

There are several situations where you'll likely need to go through the full planning permission process:

Listed Buildings

If your property is listed, you'll almost certainly need consent for internal and external changes — including loft conversions.

Conservation Areas

Salisbury has several conservation areas where stricter planning controls may apply. Even small exterior changes like dormer windows or skylights could require permission.

Large or Drastic Alterations

If you're:

—Changing the roof shape
—Raising the roof height
—Adding a front-facing dormer, balcony, or veranda

…then planning permission is typically required.

Flats or Maisonettes

Permitted development rights don't usually apply to flats or converted buildings.

What About Salisbury-Specific Rules?

Salisbury falls under Wiltshire Council, and while national planning guidelines offer a general idea, local rules and policies can vary.

It's always best to check directly with the council or consult a planning expert before starting work.

Wiltshire Council's planning portal: https://www.wiltshire.gov.uk/planning

How We Help at Complete Construction Salisbury

We know planning can be confusing — especially when you just want to improve your home without getting buried in red tape. That's why we work closely with homeowners across Salisbury to ensure everything is done by the book.

—We can advise on what's likely to need permission and what might not.
—We'll connect you with trusted planning consultants if needed.
—And if permission is required, we can help guide you through the application process or work alongside your architect.

Our goal is to make the process as smooth as possible — from concept to completion.

Want to Learn More?

—Not sure if your loft can even be converted? Read this guide first
—Wondering what the process is actually like? Here's what to expect during a loft conversion
—Ready to get inspired? Check out our Salisbury loft conversion services

Ready to Start the Conversation?

Every project starts with a chat. If you're considering a loft conversion and want to explore what's possible, get in touch with us today. We're always happy to talk through ideas, budgets, and timelines — no pressure.

And remember: even if planning permission is needed, that shouldn't put you off. With the right team, it's just another step on the path to creating your dream home.

Do I Need Planning Permission for a Loft Conversion in Salisbury?