Thinking of adding some extra living space to your UK home? A single-storey extension with a flat roof is a popular choice for many reasons. They offer a modern aesthetic, can be built relatively quickly, and may not require full planning permission. But before you dive in, it's important to understand all the aspects of this type of extension.

In this blog, RDK Civil Engineering explores everything you need to know about flat roof single storey extensions:

• Benefits: Flat roof extensions offer several advantages. They are generally more cost-effective than pitched roof extensions due to simpler construction and less material usage. The build time is also quicker, and the flat roof design can create a feeling of spaciousness.

• Regulations and Planning: While permitted development rights often allow for single-storey extensions without full planning permission, there are exceptions. Be sure to check with your local council or a building professional like RDK Civil Engineering to ensure your project complies with regulations concerning size, height, and proximity to boundaries.

• Building Considerations: A critical factor for flat roofs is proper drainage. The flat roof must have a slight pitch (around 1 in 8) to ensure water runs off efficiently to designated outlets. There are various flat roof covering options available, each with its own advantages and disadvantages. These include:

  1. Reinforced Bituminous Membrane (EPDM): A cost-effective and common choice, offering good durability.
  2. Fibreglass GRP (Glass Reinforced Plastic): A strong and long-lasting option, but requires specialist installation.
  3. Single Ply/EPDM Rubber: A modern solution, known for its ease of installation and longevity.
  4. Metal Roofing (Lead, Copper, Zinc): Traditional and highly durable, though typically more expensive.
  5. Green Roofs: These roofs incorporate plants, offering aesthetic appeal and environmental benefits, but require additional structural support.

• Working with RDK Civil Engineering: Our team of experienced civil engineers can guide you through every stage of your flat roof extension project, from initial planning and design to ensuring compliance with building regulations and overseeing construction. We can help you choose the most suitable roofing material for your needs and budget, and ensure your extension is built to the highest standards.

Considering a Flat Roof Single Storey Extension?

Contact RDK Civil Engineering today for a free consultation. We'll answer your questions, advise on the best approach for your project, and help you create a beautiful and functional extension that adds value to your home.