House Extensions
Northern Ireland
Covering, Belfast, Derry, Newry and all surrounding areas
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Extend Your Home with DPMNI Ltd
At DPMNI Ltd, we specialise in home extensions that add space, style, and value to your property — all across Northern Ireland. Whether you're looking to build a rear kitchen extension, a double-storey addition, or a side return, our experienced team manages the full process — from planning to final finishes.
15+
Years In Business
1.5k
Happy Customers
3.6k
Projects Completed
28+
Trained Staff
Our Services
Our Home Extension Services Include
Rear Extensions
Perfect for open-plan kitchens, family rooms, or dining areas, creating a bright and spacious living zone.
Side Return Extensions
Utilise unused side space in terraced or semi-detached homes to expand ground-floor living space.
Double-Storey Extensions
Add bedrooms, bathrooms, and extra living space across two levels — ideal for growing families.
Wraparound Extensions
Combine side and rear builds for maximum square footage and a seamless layout.
Bathroom & Ensuite Extensions
Create a downstairs toilet, walk-in shower, or extra ensuite for comfort and convenience.
Garage & Outbuilding Conversions
Convert garages or build attached structures for home offices, gyms, or studio spaces.
Benefits of a Home Extension
Add usable space without moving
Increase the value of your property
Improve layout and natural light
Accommodate a growing family or lifestyle changes
Create a dream open-plan kitchen or living area
Customise your home to work for you
Why Choose Us
Why Choose DPMNI Ltd for House Extensions?
Design, Build & Finish
We handle architectural drawings, building control, and every trade in between.
Bespoke Builds
Every extension is tailored to your property, layout, and goals.
All Trades In-House
Joinery, plumbing, electrics, plastering, and roofing — all included.
Regulation-Compliant
We work with building control to ensure your extension is fully certified.
High-Quality Finishes
We deliver spaces that blend perfectly with your existing home.
Local Team Across Northern Ireland
Serving Belfast, Newry, Derry/Londonderry, and more.
Frequently Asked Questions
Not always — many extensions fall under permitted development. We’ll help you determine what’s required.
It depends on size and complexity. On average:
Single-storey: 8–10 weeks
Double-storey: 10–14 weeks
Yes — we work with local architects or can refer trusted professionals to help you plan the perfect layout.
Absolutely. We blend materials, finishes, and rooflines for a seamless, integrated look.
Yes — we liaise with building control officers and provide all compliance certifications upon completion
House Extensions Across Northern Ireland
We extend homes in:
Belfast
Bangor
Newtownards
Lisburn
Ballymena
Carrickfergus
Derry/Londonderry
Newry
Armagh
Coleraine
Wherever you’re based, our team is ready to help you extend, improve, and add value to your property.
Start Your Extension Project with DPMNI Ltd
Let’s create the extra space your home needs — expertly built, beautifully finished, and ready for life.
Our Location
Belfast
Enhance your property’s exterior aesthetic with DPMNI Ltd – Northern Ireland’s trusted name in facilities management.
Townsend Enterprise Park, Townsend St, Belfast BT13 2ES
Phone: 02895606799
Email: Info@dpmni.co.uk