GT Building Design
Home Extensions & Architectural Design - Done Properly
40 years’ experience delivering practical, creative and compliant design for homeowners across Northern Ireland.
Contact Glenn
What does GT Building Design Do?
Architectural Services for Homeowners
Every project is tailored to your home, your needs and your budget.
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Extensions & Conversion
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Internal Reconfiguration & Renovations
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Planning & Building Control
Why Homeowners Choose GT Building Design
1. Chartered Expertise Fully qualified and committed to the highest professional standards.
2. Domestic Specialist Extensions, renovations, loft and garage conversions are the core focus.
3. Personal Service Glenn manages your project from first call to final approval.
4. Creative & Practical Design Solutions that enhance your home and remain achievable.
5. Local Knowledge Extensive experience with planning & building regulations across Northern Ireland.
6. Proven Results Many 5‑star reviews from satisfied homeowners.
7. Transparent Pricing Clear, written fee proposals with no hidden costs.
8. Reliable Communication You’re kept informed at every stage.
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Your Architectural Design Process
A Clear, Structured Path From First Call to Approval
1. Introductory Call
A friendly conversation to understand your ideas, answer early questions and outline what’s realistically achievable.
2. Written Fee Proposal
A clear, stage‑by‑stage proposal with transparent pricing so you know exactly what’s involved from the start.
3. Measured Survey
A detailed on‑site survey to capture accurate dimensions and assess the existing structure before design work begins.
4. Concept Design
Initial design options that explore layouts, flow and possibilities tailored to how you want to live in your home.
5. Developed Design
A refined, practical design that balances creativity, compliance and cost‑awareness, ready for planning submission.
6. Planning Application
Preparation and submission of all required drawings and documents, with all communication with Planning handled for you.
7. Building Control Drawings
Fully detailed, compliant technical drawings that give builders clear instructions and satisfy Building Control requirements.
What Clients Say
About GT Building Design
GT Building Design, led by Glenn Thompson MCIAT, is a Chartered Architectural Practice with over 40 years of experience in residential architecture. Glenn offers creative and cost-effective design solutions, guiding you from initial ideas to obtaining approvals. Each project is personally managed for clarity and a tailored design approach to your home.
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
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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 full redesign, Glenn provides clear advice, practical solutions and a personal service from start to finish.
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