The basic information to know about Double-storey extensions
A double-storey extension may seem like a much larger project to do in comparison to a single storey. They’re often a more budget-efficient way to add extra space to your home and is a lot cheaper than moving house.
Will you need planning permission for a double-storey extension?
It is possible that you can build a double-storey extension under permitted development, but it is very likely that you will need planning permission. The basic rules that planning permission will be required are if the extension:
- Extends towards the road
- Increases the overall height of the building
- Covers more than half the area of land surrounding your home
- Is taller than 4m
- Extends more than 6m from the rear of an attached house
- Extends more than 8m from the rear of a detached house
- Is more than half the width of your house
- Uses different materials to those of the original house
- Includes a balcony or raised veranda
Designing the double-storey extension –
You should consider how to blend the extension with your existing home to make sure that it doesn’t look out of place. You can do this by matching the floors and walls between the new and existing space. Another way is to use the same decorations such as colour schemes, furniture and mouldings.
You may also need to reconfigure the layout of the upstairs to make the new access to the rooms feel natural.
Adding in windows and doors that capture the most sunlight and the best views are a major point to think about when it comes to designing an extension. Bi-fold doors are a very popular option because it’s a great way to bring the outside in. They also make the space feel bigger and they allow for a lot of sunlight to enter the property.
How much does a double-storey extension cost?
The average price of a double-storey extension can cost around £60,000 however, this depends on the size of the space, your location, and how you plan on using the space.
A big factor in the cost of your extension will be the finish you are aiming to achieve. Here are a few types of finish and what they consist of depending on the size:
- Basic – The bare essentials. £40,000 – £90,000
- Average – A mix of basic and bespoke items. £47,000 – £95,000
- Deluxe – All fixtures and fittings are top quality. £55,000 – £100,000
Duration of the project –
The time scales of your project can never be precise due to delays that can happen. But roughly this is how long you should expect your extension to take:
- Small extension – 8 – 10 weeks
- Medium extension – 10 – 12 weeks
- Large extension – 12 – 14 weeks
