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GT Building Design | Glenn Thompson MCIAT | Extensions


With over 35 years experience in Architecture I will work with you to obtain Planning Permission and Building Control Approval for your extension. I guarantee you value for money, my expertise and a reliable, professional service. 

Carshaulton Road, Donaghadee 

One of my latest projects, watch this space for more photos. Planning Permission and Building Control Approval granted. Next stage starting on site and turning my drawings into reality. A beautiful home already but it's going to be superb after completion!


A summary of the Improvements to this dwelling as follows:


New Utility & Sitting Room

Provided to the rear, linking through the new Utility to a new Sitting room. Sliding doors to access the patio, sheltered under a canopy and large Velux Vario Rooflight.


New Master Bedroom / Ensuite

Provided on the first floor over the existing garage a new fourth bedroom (Master) with en-suite.

Gilnahirk Walk, Belfast 

What a difference this extension and alterations have made to this home. Check out the before and after photos. Planning Permission / Building Control approval granted and extension completed. We made use of the existing garage space to provide a new open-plan Kitchen / Dining / Family Room. A downstairs WC provided in the space where the store was. Upstairs two bedrooms substantially increased in size. Now a superb home, love it. 

Rosevale Avenue, Dunmurry 

Planning Permission and Building Control approval granted, the extension & alterations now complete. 

Check out the before and after photos to see the differences. I certainly think this home now has real kerb appeal?

The extension involved converting and building over the existing Garage.

  • On the ground floor the existing Garage space utilised to provide a new Family Room.

  • On the first floor a new Master Bedroom / Ensuite provided with an additional dormer window.

  • New zinc pitched roof installed over the extension.

  • Balcony upgraded using Trocal S single ply membrane anthracite grey.

  • Bedroom 3 to the rear increased in size with a new dormer window.

  • Windows and external doors renewed with frames in anthracite grey upvc. 

Crofton Glen, Holywood

My Client appointed me to help him remove his old two storey red conservatory and replace with a modern glazed Garden Room, open plan to the existing kitchen with a balcony above accessed from the upstairs bedrooms.


In my career of over 35 years I have never seen a conservatory quite like this one, two storey and in pillar box red!


The proposed changes will make a significant improvement to this lovely home by creating a wonderfully spacious open plan family room on the ground floor and a balcony above.