GT Building Design

Home Extensions & Architectural Designs Across Northern Ireland

Thoughtful, compliant and cost‑aware design from a Chartered Architectural Technologist with over 40 years’ experience.

Architectural Services for Home Extensions & Domestic Projects

I specialise in domestic architectural design, helping homeowners plan extensions, loft conversions, garage conversions and internal reconfigurations. Every project is tailored to your home, your needs and your budget.

Home Extensions

Practical, cost‑aware design that adds space, light and value.

Loft Conversions

Unlock unused roof space with efficient, compliant design options.

Garage Conversions

Transform an underused garage into warm, comfortable living space.

Internal Reconfigurations

Improve flow, light & functionality with thoughtful internal changes.

Planning & Building Control Approvals

Full preparation and submission of all drawings and documents.

Why Homeowners Across Northern Ireland Choose GT Building Design

Chartered expertise, clear communication and a friendly, personal service. I focus solely on domestic projects, combining creative design with practical, buildable solutions. Clients value my local knowledge, reliable communication and transparent pricing.

Home extension design Donaghadee – GT Building Design

GT Building Design provides architectural services for homeowners across Donaghadee, Bangor, Newtownards, North Down and the wider Northern Ireland

area.

Check out Homeowner Reviews

Your Home Extension & Design Process. Step by Step

A Clear, Structured Path From First Call to Securing Approvals

1. Introductory Call

A friendly conversation to understand your ideas and outline what’s realistically achievable.

2. Written Fee Proposal

A clear, stage‑by‑stage proposal with transparent pricing.

3. Measured Survey

A measured survey of your home to produce existing plans, elevations before design work begins.

4. Concept Design

Refined, practical design options that balance creativity, compliance, cost‑awareness, tailored to your wishes.

5. Planning Application

Preparation and submission of all drawings, documents and all communication with Planning handled for you.

6. Building Control Application

Fully detailed, compliant technical drawings that give builders clear instructions.

What Clients Say

Allwyn Corrin

Within a tight time frame Glenn worked quickly and efficiently to draw up plans for a beautifully designed extension to my bungalow. He was very professional, patient and helpful at all times, dealing promptly with any queries. He kept me informed throughout the whole process, and I was really delighted with his service.

About GT Building Design

GT Building Design is led by Glenn Thompson MCIAT, a Chartered Architectural Technologist with over 40 years of experience in residential architecture. I provide creative and cost‑effective design solutions, guiding you from initial ideas to obtaining approvals. Every project is personally managed for clarity and a tailored approach to your home.

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Awards & Recognition

Recognised for excellence in residential architecture across Northern Ireland:

Best Residential Extensions & Conversions

Architecture Company Northern Ireland

Most Trusted Residential Architecture Practice 2025

Best Architectural Technologist Northern Ireland

& Residential Architecture Studio of the Year 2024

Ready to Transform Your Home?

Whether you’re planning an extension, conversion or internal redesign, I offer clear advice, practical solutions and a personal service from start to finish. Competitive fees with no VAT — thanks to a lean, efficient practice model.

Book Your Introductory Call