semi-detached house extension

Semi-Detached House Extension: Things You Need to Know

Do you want semi-detached house extension to increase living space in your home? Well, you are in the right place.

There are lots of reasons to consider an extension. Most of the people add a house extension because they want more space for their family. While some do this for home improvement purposes. A semi-detached house has a common wall but provides garden on the plot.

There are the following types for semi-detached houses:

You have the right to add an extension to your semi-detached or terraced home. However, there are some rules and regulations that you need to follow such as party wall agreement, and planning permission. If the extension you are looking for requires planning application then you should start early as it is a tricky and daunting process.

Single-Storey Semi-Detached House Extension

Most of the people go for a single-storey extension because they have permitted the right to build this extension. Though they do not meet the criteria and need to apply for planning permission in some cases.

We criticize planning permission not because the process is difficult or negative. It is just time-consuming and tricky process. So, it is recommended to get help from professionals like us to help you with the process.

Many blogs have designs that fall under permitted development rights. But sometimes a homeowner needs more space for the family.

Double-Storey Ground Floor Extension

You also have permitted rights to build a double-storey extension. However, a semi-detached house does require planning permission for a better design. It is the best option as you can make an entirely new storey above the existing house. You also need to keep in mind that a new storey will require heating system upgrade and insulation to meet energy efficiency requirements.

Loft Extension

You can also consider a loft semi-detached house extension. However, you cannot exceed the height of the existing roof. Furthermore, the volume you can use is 50 cubic meters.

Other Semi-Detached House Extensions

You can also consider garages, sheds and greenhouses in your home. These kinds of extensions do not affect the existing design of the building. If your house has a dual pitched roof, then the maximum height of the building should be 4 meters.


As you can see that there is a lot that you can do with your semi-detached house. You have lots of options just like any other house. You can convert your loft for more extra space. Keep in mind that the current design will tell you what type of extension is suitable for you. Most of the simple construction work does not require planning permission. But it can limit in terms of design and functionality that you want in your home. So, if you still need planning permission then we will recommend you to start as soon as you plan the project.