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About DPMNI Ltd
Diamond Property Maintenance NI
Welcome to Diamond Property Maintenance NI, your trusted experts in roof cleaning services across North Down and Antrim. With over 30 years of experience, we specialize in delivering top-quality, eco-friendly solutions to maintain and restore your property's roof, ensuring it looks great and lasts longer.
Transform Your Roof with Our Expert Services
Over time, roofs accumulate moss, algae, and debris that can damage your property’s appearance and integrity. Our specialized roof cleaning process removes these harmful elements, restoring your roof’s natural beauty and extending its lifespan.
Benefits of Professional Roof Cleaning:
Prevent costly repairs by addressing damage early.
Boost your property’s curb appeal.
Improve energy efficiency by removing insulating moss layers
15+
Years In Business
1.5k
Happy Customers
3.6k
Projects Completed
28+
Trained Staff
Our Services
Beyond roof cleaning, we offer:

Pressure Washing
Pressure washing is a highly effective method for cleaning various exterior surfaces, including driveways, patios, decks, and walls. Our pressure washing services eliminate stubborn stains, dirt, grime, and mold, restoring the original beauty of your property’s exterior. Whether you’re in Antrim, Armagh, or Enniskillen, we tailor our services to suit your specific needs.

Soft Washing
Soft washing is a gentle yet powerful cleaning technique ideal for delicate surfaces that could be damaged by high-pressure washing. This method effectively removes dirt, algae, mold, and mildew from surfaces like roofs, siding, and fences. We proudly serve areas such as Omagh, Strabane, and Larne.

Gutter & PVC Cleaning
Proper maintenance of gutters and PVC elements is crucial for preventing water damage and ensuring efficient rainwater flow. Our services include cleaning, repairs, and replacements to protect your property from potential issues. From Downpatrick to Cookstown and beyond, we’ve got you covered

Solar Panel Cleaning
Solar panels can accumulate dirt, dust, and debris, reducing their efficiency. Our solar panel cleaning service ensures maximum energy output by removing build-up safely and effectively. Whether you’re in Belfast, Lisburn, or Bangor, we provide tailored cleaning to keep your panels performing at their best.

Driveway Resealing
Resealing your driveway protects it from wear and tear caused by weather and heavy use. Our driveway resealing service restores its original appearance, enhances durability, and prevents cracks. From Newry to Derry/Londonderry, we customize our service to meet your driveway’s unique needs.

Window Cleaning
Crystal-clear windows enhance the look of any property. Our professional window cleaning service removes dirt, streaks, and smudges, leaving your windows spotless and gleaming. Serving homes and businesses across Antrim, Armagh, and Newtownards, we deliver results you’ll love.
Additional Services
Beyond our core offerings, we provide:
- Commercial Cleaning: Exterior and contract cleaning for businesses. Learn more on our Commercial Cleaning page.
- Floor Restoration: Bringing life back to your floors. Visit our Floor Restoration page.
- Farm Yard Cleaning: Safe and efficient cleaning for farmyards to maintain hygiene and functionality.
- Roof Surveys: Detailed inspections for structural integrity. Explore our Roof Surveys page.
- Skylight Cleaning: Our skylight cleaning service removes dirt, dust, and grime to restore clarity and maximize natural light, serving homes and businesses across Northern Ireland.

Why Choose Us
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.
Tailored Solutions
Every roof is unique, which is why we provide a free consultation and custom cleaning plans.
Proven Track Record
With over 1,400 satisfied customers, we’re trusted by homeowners and businesses alike.
Local Expertise
We understand the unique challenges in North Down and Antrim, tailoring our services to meet the specific needs of your area.
EXCELLENT Based on 29 reviews Megan FitzsimmonsTrustindex verifies that the original source of the review is Google. Great service 10/10 Tracey WoodsTrustindex verifies that the original source of the review is Google. I approached Tristan at Diamond Property Maintenance having seen a Tik Tok video demonstrating their impressive approach to cleaning gutters! A conversation with Tristan led me to decide to engage other services as well, keen as I was to do what I can to protect the house against damp. Tristan explained the benefits of cleaning my roof of all mud/moss and talked about how the protective coating applied would protect my roof for the long-term. There was no hard-sell, just a knowledgeable approach that put me at my ease. The team were great, and I am delighted that we have had this work done, one to protect our home, but I am even more delighted at the significant improvement to the house’s appearance. The colour of the original roof tile is just lovely, and they also cleaned our patio and driveway, again using their protective coating to prevent the unsightly green/brown staining from re-emerging. I would definitely recommend Tristan and his team. Very impressed by the service received. Doreen McGuinnessTrustindex verifies that the original source of the review is Google. Brilliant work!! The difference in the outside of my property is amazing. Defo recommend gail stewartTrustindex verifies that the original source of the review is Google. Our driveway looks like new again! Cleaned, treated and sealed - brilliant job & great communication Belinda DohertyTrustindex verifies that the original source of the review is Google. Had these guys out for outdoor maintenance, pressure washing and gutter cleaning. They did a fantastic job. Friendly, professional and reliable, wouldn't hesitate to recommend them. Thanks so much! Adrian BradleyTrustindex verifies that the original source of the review is Google. Great guys and a pleasure to work with. Did an amazing job and their head for heights is amazing. Best in the market. 👍👍👍 The OnLegs Agency Kate RooneyTrustindex verifies that the original source of the review is Google. We are absolutely delighted with the results. We went for the roof to gate option and could not be happier ☺️ The roof exceeded our expectations. The house feels like new. Checkout Before and after pics to see for yourself. Highly recommend the Team DPMNI Ltd Ailish McMeelTrustindex verifies that the original source of the review is Google. From the initial quote to the finished job these guys were very efficient and friendly. We had a roof clean and the entire place was left spotless. The work is also guaranteed which is fabulous. Would definitely recommend. KPJ FergusonTrustindex verifies that the original source of the review is Google. These guys came out done a fantastic job with no hassle at any expense. Certainly recommend the work I had got done 👍. Abbie EdgarTrustindex verifies that the original source of the review is Google. Great customer service. Came when they said they would, did a good job and left everything clean and tidy. Would highly recommend. Thanks again 😊
Frequently Asked Questions
We recommend professional roof cleaning every 2-3 years to maintain its appearance and prevent damage caused by moss, algae, and debris.
Absolutely. We use eco-friendly, low-pressure cleaning techniques and solutions that are safe for your roof, plants, pets, and the environment.
Yes, we provide free, no-obligation quotes for all our services. Contact us today to schedule your consultation.
We serve all towns and cities in North Down and Antrim, including Bangor, Lisburn, Ballymena, Carrickfergus, and more.
Yes, our soft washing service is specially designed for delicate surfaces like roofs, siding, and fences, ensuring effective cleaning without damage.
Yes, we offer a wide range of commercial cleaning services, including pressure washing, window cleaning, and contract cleaning for businesses.

Local Experts Serving Northern Ireland
We are proud to serve homes and businesses across Northern Ireland, including the following main towns and cities:
No matter where you are, our team is ready to provide top-notch property maintenance services tailored to your location’s specific needs. We provide a province-wide service across Northern Ireland.
Ready to transform your roof?
Get Your Free Quote Now and enjoy a cleaner, healthier roof with Diamond Property Maintenance NI.
Our Location
Belfast
Don’t let moss and debris ruin your roof. Contact us today for a free consultation and see why we’re the go-to roof cleaning experts in Northern Ireland
Townsend Enterprise Park, Townsend St, Belfast BT13 2ES
Phone: 02895606799
Email: Info@dpmni.co.uk