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Architectural planning drawing with a pen resting on blueprints — representing planning permission guidance for Northern Ireland homeowners.

Planning Permission NI

Clear guidance for Northern Ireland homeowners

Do I Need Planning Permission in Northern Ireland?

Most homeowners aren’t sure whether their project needs planning permission and the rules in Northern Ireland differ from the rest of the UK. GT Building Design prepares all drawings and manages every Planning Permission application on your behalf, ensuring your project starts correctly and complies fully.

What Planning Permission Covers

Planning Permission decides what you can build, where you can build it, and how it looks.

 

It deals with:

  • Neighbours and privacy

  • Streetscape and visual appearance

  • Light and overshadowing

  • Local planning policies

  • Conservation areas and coastal restrictions

 

Under NI planning law, any work that changes the structure of your home is considered development, meaning it may require Planning Permission or a Certificate of Lawfulness.

 

Planning Permission is separate from Building Control — many projects require both.

Extensions - Planning Permission Rules in NI

When Planning Permission Is Required

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Planning Permission is normally required for:

  • Extensions beyond permitted development limits

  • Two‑storey extensions

  • Front extensions

  • Extensions visible from the road in conservation areas

  • Significant roof shape changes

  • Extensions that alter the principal elevation

  • Extensions that overshadow neighbours or reduce privacy

 

Permitted Development - NI Limits

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Some extensions may fall under Permitted Development if they meet all of the following NI rules:

  • Extension + other outbuildings must cover less than half the garden

  • Extension must not be higher than the existing house

  • Projection limits: 4m for detached homes / 3m for semi‑detached or terraced homes

  • Eaves within 2m of a boundary must be max 3m high

  • No part may extend beyond a principal elevation facing a road

  • Materials must be similar in appearance

  • Conservation areas have stricter rules

 

Even if your idea appears to fit these limits, the only way to get certainty is to submit either:

  • a Certificate of Lawfulness, or

  • a Full Planning Application

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I’ll advise clearly on what applies.

Loft Conversions - Planning Permission Rules in NI

Internal Loft Conversions

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Internal loft conversions do not require planning permission.

 

Dormers, Rooflights and Roof Alterations

 

Planning Permission is required if:

  • A dormer faces the road

  • You’re in a conservation area

  • Rooflights project more than 15cm on a road‑facing slope

  • Dormers are higher than the existing roof

  • Dormers are not 0.5m from ridge, eaves or party walls

  • Materials do not match the existing house

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These rules are often misunderstood — I’ll confirm exactly what applies to your home.

Garage Conversions - Planning Permission Rules in NI

When Planning Permission Is Not Required

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Planning Permission is not required if:

  • You’re converting the garage internally

  • You’re not altering the external appearance

  • You’re not adding windows facing a road

  • You’re not extending the footprint

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When Planning Permission Is Required

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Planning Permission is required if:

  • You’re changing the external appearance

  • You’re adding new openings facing a road

  • You’re extending the garage

  • You’re in a conservation area

What I Prepare for Your Application

I handle the full submission, including:

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  • Existing and proposed drawings

  • Elevations and sections

  • Site and block plans

  • Site Location Plan

  • Design statement (if required)

  • All communication with Planning

  • Amendments if requested by the Planning Case Officer

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You don’t deal with Planning — I do.

Typical Approval Timelines

  • 8 -12weeks — standard applications

  • 12 + weeks — complex sites

  • Longer if Planning requests amendments

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I manage the process and keep you informed throughout.

Common Issues Homeowners Face

These are the problems I resolve regularly:

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  • Builders starting work without planning

  • Incorrect assumptions about permitted development

  • Poor‑quality drawings rejected by Planning

  • Overlooking and privacy concerns

  • Roof alterations not matching policy

  • Neighbour objections

  • Delays due to missing information

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A clear, well‑prepared application avoids most of these.

Why Planning Permission Matters

Getting planning wrong can lead to:

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  • Enforcement notices

  • Forced removal of work

  • Delays and extra costs

  • Problems when selling your home

  • Mortgage or insurance complications

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A proper application protects your project and your property value.

How I Help

I specialise in:

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  • Accurate, compliant drawings

  • Straightforward communication

  • Managing the entire application

  • Ensuring compliance with NI planning policy

  • Guiding you through every step

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My role is to make the process simple and predictable.

Considering a Project? Start with a Feasibility Study

If you’re unsure whether your idea needs planning permission — or whether it’s even possible — a feasibility study is the best first step. It answers:

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  • What’s allowed

  • What’s not

  • What Planning will likely approve

  • What Building Control will require

  • What the project will involve

  • Whether the idea is worth pursuing

 

This prevents wasted time, unnecessary drawings, and unrealistic expectations.

Ready to Begin?

If you’re planning an extension, conversion, or alteration, I can confirm exactly what approvals you need and prepare everything required.

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