GT Building Design

Celebrating 40 years of architectural excellence.

Transform your home with Glenn, who is highly experienced and specialises in house extensions, alterations, loft conversions and garage conversions across Northern Ireland.

GT Building Design is a Chartered Architectural Practice based in Donaghadee, providing professional architectural services for homeowners seeking to improve, extend or redesign their living space. Founded by Glenn in 2004, the practice offers expert guidance through every stage of your project — from initial design ideas to planning permission, building control approval and construction.

With over 40 years’ experience in architecture and an in‑depth knowledge of Northern Ireland’s building regulations, Glenn delivers creative, practical and cost‑effective solutions tailored to your home.

Why choose GT Building Design?

What makes GT Building Design the Trusted Choice for Homeowners:

Personalised Service – Glenn manages your project from start to finish, ensuring clear communication and a tailored design approach.
Chartered Architectural Practice – Fully qualified and committed to the highest professional standards.
Residential Architecture Specialist – Expertise in home extensions, renovations, loft conversions and garage conversions.
Local Knowledge – Extensive experience with planning permission and building regulations in Northern Ireland.
Proven Results – Many 5‑star reviews from homeowners who have successfully transformed their properties.
Transparent Pricing – Clear, written fee proposals with no hidden costs.
Creative & Practical Solutions – Designs that enhance your home while staying functional, achievable and budget‑aware.
Reliable Communication – You’ll be kept informed at every stage of the design and approval process.

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Your Architectural Design Process with GT Building Design

Introductory Telephone Consultation - An initial call to discuss your project ideas, answer questions and provide early architectural advice for your home extension, renovation or conversion.
Detailed Written Fee Proposal - A clear, transparent proposal outlining all architectural fees, project stages and any expected expenses — helping you plan your home improvement project with confidence.
Measured Survey of Your Property - A full on‑site measured survey to record accurate dimensions and assess the existing structure before preparing architectural drawings.
Existing Plans and Elevations - Professionally drafted existing drawings of your home, forming the essential base for designing your extension, loft conversion or garage conversion.
Bespoke Design Proposals - Tailored architectural design options created around your wish‑list, lifestyle and budget. All proposals are reviewed and approved by you before progressing to planning.
Planning Permission & Building Control - Complete preparation and submission of all drawings and documents required to secure Planning Permission and Building Control approval in Northern Ireland — ensuring your project meets all regulations.

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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.

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