Roofing Basics for UK Home Extensions and Conservatories
If you’re adding a conservatory, loft conversion or garden room, the roof is the most important part you’ll touch. A solid roof keeps the weather out, protects the structure and can boost the look of your home. In this guide we’ll break down the main roof types, material options and simple maintenance tricks you can use right away.
Choosing the right roof type
Most UK extensions use one of three roof styles: pitched, flat or lean‑to. A pitched roof is the classic shape with two sloping sides. It sheds water quickly, which is great for rainy Britain, and works well with tiles, slates or shingles. Flat roofs are popular for modern conservatories because they give a sleek line and allow you to add skylights, but they need extra waterproofing layers to prevent leaks. A lean‑to roof is basically a single slope that leans against an existing wall – perfect for small garden rooms where you want a low profile.
Material matters
When it comes to roofing material, durability, cost and appearance drive the choice. Clay or concrete tiles are common and blend nicely with period homes. Slate looks premium and lasts decades, but it’s heavier and pricier. For flat roofs, EPDM rubber, PVC or modern felt membranes are the go‑to options – they provide a smooth, water‑tight seal. If you’re after a budget‑friendly solution, metal panels are lightweight, rust‑resistant and quick to install. Just make sure the under‑lay is rated for metal to avoid condensation.
Don’t forget about insulation. Roof insulation not only cuts heating bills, it also reduces condensation on the interior. R‑values of 0.25–0.35 m²K/W are typical for pitched roofs, while flat roofs benefit from rigid board insulation placed underneath the waterproof layer.
Ventilation is another piece of the puzzle. A well‑ventilated pitched roof uses ridge vents or soffit vents to let moist air escape. For flat roofs, sprinkling a few vent pipes or incorporating a breathable membrane helps manage humidity.
Now that you know the basics, here are three practical steps to keep your roof in shape after the build:
- Inspect the roof after the first heavy rain. Look for missed flashing, loose tiles or pooling water on flat sections.
- Clear gutters and downspouts regularly. Blocked drainage is a leading cause of roof leaks.
- Schedule a professional check every 5‑7 years, especially for flat roofs where the waterproof membrane can degrade.
Following these tips will save you time, money and a lot of headaches. Whether you’re fitting a new conservatory roof or tightening up an existing loft, a solid roof starts with the right design, the right material and a bit of regular care.
