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Flat Roofs Construction

Flat Roof Extension | Kabi Flat Roofing

Are you considering getting a flat roof extension to expand your home with style? If so, we are here to encourage you to go for it. This modern architecture is one of the best trending options nowadays. With endless possibilities of versatile designs, flat roof extensions in London have been gaining tremendous popularity – and that too for all the right reasons!

“Creativity is a natural extension of our enthusiasm.”

Earl Nightingale. 

Read on as this blog will take you through everything you need to know about flat roof extension.

What Is A Roof Extension? 

As the name suggests, a roof extension is a structural update of the roof in order to add more height, strength, and character to your home. It is an excellent way of creating more space and enhancing the aesthetics of your home. Depending on your vision, roof extensions can be used to create anything from a great outdoor patio to a fully functioning home extension.

The two most common types of roof extensions include flat and pitched roof extensions. In this article, however, we will exclusively talk about flat roof extensions.

Why Is A “Flat Roof” A Good Choice For Roof Extensions? 

The history of flat roofs has been one with a lot of ups and downs. Decades ago, it was one of the least preferred roofing styles. It was because the materials previously used did not do the basic job of keeping the inside of the structure dry. However, this is not the case anymore – thanks to the innovations in present-day flat roofing materials.

Modern materials, such as PVC and EPDM membranes have entirely changed the flat roof game. Not only are they durable and long-lasting, but these roofing materials are also one of the most leak-proof options in the roofing industry. They show resistance even in harsh weather conditions like winds and storms. Conversely, they are also resistant to blistering and cracking during the hot summer days. There is no doubt that the contemporary flat roofing system is one of the best options out there in the market. 

Listed below are some of the reasons why you need to get a flat roof extension in your home:

Provides Double Space

The most practical feature which you can avail is that it helps you expand your space by two-folds. In other words, since the roof is flat, you can make use of both the area on the top of the roof and the space beneath it. This feature makes the flat roof extension stand out from any other type of roof extension. With flat roof extensions in London, you can refurbish your home by making an exquisite living space on the ground level; as well as a terrace on the first floor!

Much More Flexibility

The flexibility offered with a flat room extension is tremendous. Other roofing systems, such as a pitched roof extension, need more structural reinforcement in their orientation. Meanwhile, in a flat roof extension, you do not require any such supporting structures, which in turn give you a continuous canvas to paint on. 

For instance, if we talk about roof glazing, flat roof extensions offer a lot of versatility as compared to a pitched roof. For example, flat roofs provide additional eco-friendly options which cannot be availed on a pitched roof. This includes green roofs, which come with a special roof barrier and a drainage system, which are one of the most aesthetically pleasing innovations of flat roof extensions. They help make your air naturally fresh while providing great insulation at the same time. 


As we mentioned earlier, flat roof extensions require less structural support as compared to pitched roofs. This means, no additional supporting materials are required in building one; making it a much more affordable option. However, you must ensure that you invest in high-quality materials as this will ensure the longevity of your roof. 

Another bonus of flat roof extensions is that they increase the value of your home by 10-15 per cent. This is great for those who are planning to sell their property shortly. 

How Much Does A Flat Roof Extension Cost?

So far, you already know that flat roof extensions are an ideal choice for homeowners who are looking to minimise their overall project costs. The pricing mostly depends on the roofing material you choose – the higher the rates, the better the quality. Three of the most commonly used materials are listed below: 

  • Roofing felt – £50-£70 per square metre
  • EPDM membrane – £80-£100 per square metre
  • Fibreglass – £90-120 per square metre

The prices depend on several other factors as well such as labour costs, the extent of design, the condition of the current place, and the ease of access. The costs tend to rise further with added features including lighting, flooring, and installing utilities.

The average flat roof extension cost in the UK is around £1850. With additional elements and details, you can expect the price to go as high as over £2500.

Do You Need Planning Permission for a Flat Roof Extension?

The simple answer to this is: yes, you need planning permission for a flat roof extension. To understand the purpose of this, let’s dive into a little more detail.

Whenever you plan on doing any developmental work, you need to meet specific standards, called building regulations. This is to protect people from building dangerous structures and poor workmanship. Before starting your project, you need to get official permission, which is granted only if you meet the building regulations. In other words, getting planning permission is like asking if you are allowed to do a certain kind of building work. If your project needs planning permission and you do the work without getting it, you can be served an ‘enforcement notice’ ordering you to undo all the changes you have made. [1]

Therefore, you must apply for planning permission before your flat roof extension project starts. To do so, contact your LPA through your local council. [2] And of course, it goes without saying: you need to be the homeowner of the house to apply.

Flat Roof Extension Inspirations

To make you fall even more in love with flat roof extensions, we are here with a list of inspirations that will help you create your unique design. Pick your favourite idea and experiment with it to match your taste! 

Roof Lanterns and Roof Lights

Gigantic roof lanterns and roof lights are an important aspect of modern architecture because of their great variety of sleek and slim designs. They can be a great addition to your roof extension if you prefer abundant natural light inside your home. 

This feature gives an illusion of an elevated ceiling; bringing you closer to nature outside. Trust us, with these roof lanterns, you won’t help but get distracted by the clouds passing overhead during the day and you will also get to stargaze during the night from the comfort of your home.

Bifold and Sliding Doors

While roof lanterns and glass roof lights focus the vertical light into your living space, floor to ceiling doors are another ground level, a light-focusing feature of flat roof extensions in London. Among such doors, bifold doors are the most popular choice. Made of aluminium; these dark-toned doors create a seamless link from your home to your garden. 

Another popular choice is the sliding doors, which take less structural space – making it an ideal choice if you prefer to make the most out of the space. These giant doors help create a blurring effect between the outdoors and indoors, proving to be a perfect addition to flat roof extensions.

Outdoor Cladding

Paying attention to external solid areas is an important part of a flat roof extension project. Outdoorladding, in simpler words, is the finishing of the outer structure. As important as it is to keep the aesthetics in mind, the most essential aspect is the durability of the cladding materials. 

For example, vinyl cladding, PVC cladding and render are some of the most long-lasting cladding materials in the market. With a wide range of colours and styles to choose from, the use of high-quality cladding materials can elevate the look of your home! 

The Bottom Line

We highly recommend you invest in the finest bullying materials and efficient workforce to lay a strong foundation for your roof extension. With a great deal of versatility and ease of construction, flat roof extensions in London undoubtedly remain the most popular kind of roof extension of the present day.

At The Family Roofing Company, we specialise in all sorts of flat roof projects. Call us or get a free quote right now! 

People Also Ask 

  1. Do you need planning permission for flat roof extension?

Yes, you need to obtain a planning permission for a flat roof extension. 

  1. Do you have to notify neighbours permission for extension?

The Council itself notifies the neighbours within three days of validating the application for planning permission. You can still notify them if you prefer, however it’s not an official obligation.

  1. Do I need an architect for a small extension?

It is always a good idea to hire an architect for extension, regardless of the size and extent of the project. Some jobs are best done when left to the professionals and extending your roof is no exception.

  1. Is an architect worth the money?

Hiring an architect with a good reputation and workmanship is always worth the money. A good architect will comply with the building regulations and safety precautions, as well as provide the perfectly finished roof extension in no time.


1. Project Planning Permission


2. Local Council


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