Adding a skylight or roof light is a brilliant way to enhance your home’s natural light, ventilation, and energy efficiency. But many homeowners ask, “Do I need Planning Permission for Skylights?” The answer depends on several factors—including your property type and location. This guide will clarify everything and show how KT5 Construction helps you stay compliant while saving money on your home upgrades.

What Is Planning Permission—and When Is It Required?

Planning permission is official approval from your local authority to make significant changes to your property. While many skylight installations fall under Permitted Development Rights, not all do.

General Rules for Skylights Under Permitted Development

In England and Wales, you generally do not need planning permission if your roof light or skylight:

• • Does not project more than 150mm from the roof plane

  • Is not higher than the highest point of the roof

  • Uses obscure glazing if side-facing and opens only above 1.7m from floor level

These criteria come directly from the UK Government’s Planning Portal and apply to standard properties that aren’t listed or in protected zones.

When Planning Permission Is Needed For Skylights

Even a small project like installing a skylight can require permission under certain conditions:

• • Your property is in a conservation area or governed by an Article 4 Direction, which removes Permitted Development rights.

  • You’re working on a listed building

  • The skylight design affects the roof profile significantly

  • You’re near a boundary and need to consider fire performance

Failing to get approval when required can result in enforcement action or expensive fines.

Rooflights & Building Regulations

Even when planning permission isn’t necessary, your project must comply with Building Regulations:

Key Considerations:

• • Thermal efficiency: Your roof light must meet Part L standards for heat retention. The Ug value (a measure of heat loss) must fall within regulated limits. Many modern rooflights, like those with triple glazing, exceed these requirements.

  • Ventilation and safety: Skylights must support proper airflow while maintaining structural integrity.

  • Fire safety: If close to a neighbour’s boundary, materials must meet fire-resistance standards.

At KT5 Construction, we handle these checks for you—ensuring full compliance so you avoid costly delays or retrofits.

KT5 Construction: Helping You Save Money and Stay Compliant

Expert Advice and Smart Solutions

KT5 Construction brings over 25 years of experience working across Surrey and London. We offer expert guidance tailored to your property’s location and structure, identifying when planning permission is needed and designing around potential obstacles.

Here’s how we help homeowners save money:

• • Free site surveys to confirm if your skylight qualifies under Permitted Development

  • Bespoke designs that minimise structural changes and lower material costs

  • Efficient installations with experienced builders and no-nonsense pricing

  • Help with planning applications and Building Control liaison if needed

Frequently Asked Questions – Planning Permission for Skylights

1. What’s the difference between a skylight and a rooflight?

Functionally, they’re similar. “Skylight” is the more common term, while “rooflight” often refers to flat-roof installations.

2. How long does planning permission take?

It usually takes 8 weeks from submission to decision, though complex cases may take longer.

3. Can I install a roof light in a conservation area?

Yes—but you’ll likely need full planning permission. KT5 can assist with the application process and provide drawings.

4. Will a skylight make my home more energy efficient?

Absolutely. High-spec models with low Ug-values dramatically reduce heat loss, especially when paired with options like solar control glazing or automated blinds.

Let KT5 Light Up Your Home—Legally and Affordably

In most cases, you won’t need planning permission to add a skylight—but knowing when you do is crucial. Let KT5 Construction handle the details. We’ll ensure your roof light installation is compliant, cost-effective, and beautifully executed.

 Contact KT5 Construction today for a free quote or expert consultation—save money and stay within the law.