GT Building Design

Home Extensions & Architectural Design - Done Properly

40 years’ experience delivering practical, creative and compliant design for homeowners across Northern Ireland.

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What does GT Building Design Do?

Architectural Services for Homeowners

Every project is tailored to your home, your needs and your budget.

Extensions & Conversion
Internal Reconfiguration & Renovations
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.

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

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, 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.

Read the full About page

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 full redesign, Glenn provides clear advice, practical solutions and a personal service from start to finish.

Book Your Introductory Call