Loft Conversions
Belfast
Maximise Space & Add Value with Expert Loft Conversions Across Northern Ireland
Loft Conversions by DPMNI
Unlock the full potential of your home with a professionally built loft conversion in Belfast. At Diamond Property Maintenance (DPMNI), we transform underused attic spaces into modern, functional living areas that enhance your home and increase its value — without the need to move house.
Whether you’re adding a new bedroom, office, or a luxurious master suite, we deliver tailored, high-quality loft conversions throughout Belfast and Northern Ireland, from design to decoration.
Trusted by Homeowners, Landlords & Businesses
Why Convert Your Loft?
Loft conversions are one of the most efficient and cost-effective ways to:
Increase your home’s liveable space
Add bedrooms, bathrooms, or a home office
Boost resale value by up to 20%
Adapt your home for a growing family
Improve energy efficiency with upgraded insulation
Avoid the cost and hassle of moving
Most lofts are suitable for conversion — and many projects fall under Permitted Development rights, meaning no planning permission is needed.
Our Loft Conversion Process
We offer a fully managed, end-to-end loft conversion service:
We manage the build from start to finish — keeping communication open and disruption minimal.
Common Loft Conversion Uses
We tailor every project to suit your lifestyle, goals, and property layout.
Types of House Extensions We Offer
We design and build a wide range of extensions for every type of home:
Also known as rooflight conversions, these use the existing roof structure with added Velux windows — the most cost-effective and planning-friendly option.
A flat-roofed dormer extends out from the existing roofline to provide more headroom and usable floor space. Ideal for bedrooms and en suites.
Common on semi-detached homes, this extends a sloping roof to create a vertical wall (gable), significantly increasing internal space.
A full-width conversion offering maximum space and flexibility, ideal for large master bedrooms or multiple rooms.
Perfect for Victorian and Edwardian terraced homes, this style connects two dormers to maximise space over rear extensions or outhouses.
Frequently Asked Questions
Many loft conversions fall under Permitted Development — especially Velux and basic dormers. We can handle all planning and Building Control applications on your behalf.
Costs depend on type and size:
Velux conversion: from £18,000+
Dormer conversion: from £28,000+
Mansard/L-shaped: from £40,000+
We offer fixed-price quotes after a free consultation.
Typical conversions take 6–10 weeks, depending on the complexity and weather conditions.
Most lofts are suitable if there’s enough head height (2.2m+ at the highest point). We’ll assess this during your free site visit.
Yes — a professionally converted loft can increase your home’s value by 15–20%, especially if it adds a bedroom or bathroom.
Six Reasons For People Choosing Us
Experienced Team
Our time-served tradesmen are PASMA and IPAF-trained professionals, ensuring safe and efficient service.
Comprehensive Insurance
We carry £10 million public liability insurance and specialized SSR insurance for your peace of mind.
Eco-Friendly Cleaning
We use child-safe, animal-safe, and plant-safe cleaning solutions to protect your environment.
Proven Track Record
With over 1,400 satisfied customers, we’re trusted by homeowners and businesses alike.
Tailored Solutions
Every job is unique, which is why we provide a free consultation and custom plans based on your needs.
Local Expertise
We understand the unique challenges in North Down and Antrim, tailoring our services to meet the specific needs of your area.
Ready to upgrade, expand, or transform your property?
Book a Free Loft Conversion Consultation
Maximise your space and transform your home with a stunning, professionally built loft conversion by DPMNI — trusted builders serving Belfast and Northern Ireland.
Other Exterior Cleaning Services We Offer
We provide reliable, efficient, and environmentally conscious cleaning for residential, commercial, and agricultural clients.
HouseExtensions
Add extra space, value, and function to your home with a professionally built extension. Ideal for growing families or creating open-plan layouts.
LoftConversions
Transform your unused attic into a functional, stylish living area — whether it’s a new bedroom, office, or playroom.
HouseRenovations
From reconfigurations to full refurbishments, we modernise homes with high-quality renovation services designed around your lifestyle and budget.
KitchenFitters
Upgrade your kitchen with bespoke fitting and installation. We handle everything from unit fitting to flooring, tiling, and finishing touches.
BathroomFitters
Create a functional, elegant bathroom with our expert team. We install baths, showers, sinks, toilets, and full wet room setups.
RoofRepairs
From storm damage and minor leaks to structural issues, we offer fast, reliable roof repairs for homes and commercial properties.
RoofReplacement
We carry out full roof replacements using modern, durable materials — protecting your property and enhancing its appearance.
Gutter, PVC& Fascia Fitting
Upgrade or replace damaged exterior components with our expert PVC, fascia, and gutter fitting — protecting your roofline and improving drainage.
Fencing& Repairs
Secure your property and add privacy with custom fencing solutions — from wooden boundary fencing to decorative garden panels.
Landscaping& Hardscaping
Transform your outdoor space with our tailored landscaping services, including paving, turfing, decking, garden design, and more.
IndustrialFacility Repairs
Keep your site compliant and running smoothly with responsive, cost-effective industrial maintenance and repair services.