Planning Permission in East Sussex: A Complete 2025 Guide

Understanding planning permission is essential before starting any building project in East Sussex. This guide covers the key rules, common exemptions, and practical steps for homeowners in Brighton and surrounding areas.

Do You Need Planning Permission?

Not all building work requires planning permission. The UK's Permitted Development (PD) rights allow many alterations and extensions without a formal application—provided they meet specific criteria for size, height, and positioning.

Projects That Usually Don't Need Planning Permission

• Single-storey rear extensions up to 4m (detached) or 3m (attached)
• Garage conversions (internal changes only) — see our garage conversion ideas guide
• Decking and patios under 300mm above ground level
• Internal structural alterations including RSJ installations
• Rendering and plastering (in most cases)

Projects That Typically Need Planning Permission

• New builds — see our new build cost guide
• Extensions exceeding PD limits
• Change of use (e.g., commercial to residential)
• Work affecting the external appearance in conservation areas

Conservation Areas in Brighton

Brighton & Hove has over 30 conservation areas where PD rights are restricted. If your property is within one—such as the Clifton Hill, Round Hill, or Preston Park conservation areas—you may need planning permission for external changes that would otherwise be permitted. Always check with the council before proceeding.

Building Regulations vs Planning Permission

These are separate requirements. Even if planning permission isn't needed, most structural work requires building regulations approval. This includes foundations, structural alterations, electrical work, and drainage. Building regulations ensure safety, energy efficiency, and structural integrity.

The Application Process

1. Pre-application advice — Brighton & Hove council offers pre-application consultations. This isn't mandatory but can save time and money.
2. Submit application — Applications are made through the Planning Portal. Include drawings, design statements, and any required surveys.
3. Consultation period — Neighbours and relevant bodies are consulted. This typically takes 21 days.
4. Decision — Most householder applications are decided within 8 weeks.

How Masters Group Can Help

We've navigated the planning system in Brighton, Worthing, Eastbourne, and across East Sussex for over 30 years. We advise on what requires permission, coordinate with architects and planners, and manage the process so you can focus on your project vision. Read our customer reviews to see what clients say about our service.