TDH Contracting

How To Build A Flat Roof Extension - 7 Simple Steps!

How To Build A Flat Roof Extension

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As a homeowner, you may be considering a Flat Roof Extension, However, knowing how to build a flat roof extension will help you to understand the process and skills required. Here at TDH Contracting, we provide flat roof extensions to residential and commercial properties across the USA. If you are looking for an article that has been written from experience then we can help.

Based in Waterloo, Nebraska, we have over 10 years of roofing experience, building both flat and pitched roofs for customers.

In this expert guide, we will share our knowledge with you and provide you with 7 simple steps to building a flat roof extension for your home!

How To Build A Flat Roof Extension

Building a Flat Roof Extension is simple if you know how. With our years of experience, we have built a large number of flat roofs, from small property improvements to large extensions. Through our experience, we have identified 7 simple steps that you can follow to complete a flat roof project. These steps include the planning and execution of such a project along with a guide to follow to get quality results.

  1. Plan Your Design
  2. Obtain The Required Permits
  3. Prepare The Foundation
  4. Build The Walls And Roof
  5. Install The Roofing Material
  6. Install The Gutters And Drainage System
  7. Finish The Interior And Exterior

Step 1: Plan Your Design

The first step to building a flat roof is to plan your design. Planning is essential in any roofing project, especially a flat roof one. You need to decide on the shape and size of your extension. You also need to take into consideration any planning permission or local regulations and restrictions. It is vital to do your research now to prevent any issues with your installation in the future.

It is also a good idea to apply for any relevant planning permission at this stage to protect your home from any building regulations and issues.

Step 2: Obtain The Required Permits

Now that you have the project plan, you need to apply for the required permits. Building regulations usually state several permits and licenses that you require for flat roof installations. You will need these before getting started to ensure that you avoid any issues with your house later.

Step 3: Prepare The Foundation

The third step is to prepare the foundation. Like with anything, if the foundation isn’t right, then the project won’t be right either. Building Regulations may require you to meet certain requirements. Make sure you prepare a sturdy and level foundation that can support the weight of your extension. Also, ensure the foundation meets your desired design as this cannot be changed.

Step 4: Build The Walls And Roof

Once you have built the foundation, you can start building the walls and roof of your extension. Your roof will require a slight slope to ensure proper drainage so ensure you factor this into your project.

Step 5: Install The Roofing Material

Once the structure is in place, you need to choose your roofing material. Popular options include EPDM rubber, PVC, and TPO. Make sure to install materials to suit your budget and project.

Step 6: Install Gutters And Drainage System

Efficient drainage is essential for any flat roof system. Install gutters and drainage to ensure water is directed away from your property to prevent damage.

Step 7: Install Gutters And Drainage System

Finally, you need to finish the interior and exterior of your flat roof extension to make your project look great. Consider furniture, siding and drywall within your extension to make the end result look great.


With these 7 simple steps, you can learn how to build a flat roof extension and deliver a great end result. By following the expert tips and experience of TDH Contracting, you can increase your living space and add value to your property. If you would like any more information, speak to our team today.