About us

Serving Durham, Ontario Region since 1958

Door & Window Improvements For More Than 67 Years

At Dowling & Sons, installing windows and doors isn’t just a job — it’s our passion. We take pride in delivering high-quality window and door installation services that enhance the style, energy efficiency, and personality of your home or business. From custom designs and colors to the finest details, every project reflects our commitment to expert craftsmanship and customer satisfaction. We offer free consultations, clear budget quotations, and the latest in glass, window, and door technologies — all with eco-friendly options to help reduce your energy costs and environmental impact.

Window and Door Installation

Frequently asked questions

There’s no minimum order requirement for our window replacement services — whether you need to replace a single window or install a hundred new windows, we’re ready to help. Our team provides professional window installation for projects of any size, delivering quality and value every time.

Yes, we offer glass-only replacement services. If your window or door frame is still in good condition, we can replace just the broken or fogged glass to restore clarity, insulation, and performance without a full unit replacement.

Yes, we offer custom-sized windows and doors designed to fit non-standard openings perfectly. Our expert team will carefully measure your space and recommend the best custom window and door solutions to ensure a seamless fit and professional installation for your home.

A full-frame window replacement involves removing the entire window or door, including the old frame, whereas a retrofit window installation keeps the existing frame intact. Full-frame replacements provide superior energy efficiency, address problems like rot or warping in the original frame, and deliver a complete, long-lasting upgrade for your home.

The answer depends on the age and condition of your windows. Older, inefficient windows can lead to energy loss and higher utility bills. By upgrading to modern, energy-efficient windows, you can significantly reduce heating and cooling costs while improving comfort, durability, and overall home performance.

We only install products that we supply to ensure quality and warranty coverage. Exceptions may be made for builders on a case-by-case basis.