single storey extension cost

How Much Does A Single Storey Extension Cost in 2020?

Adding an entirely new storey to your home is a brilliant way to introduce more living space for your growing family. A single storey extension allows you to add a new home office, kitchen space. Furthermore, it is a cost-effective alternative to moving your house. In this article, we will discuss the single storey extension cost.

There are various ways to break down the cost. We will first discuss some rough costs of the project.

The cost of construction depends on the results you want to achieve. Depending on that, it can cost you around £1,500 to £1,900 per square meter for basic and £1,900 to £2,200 per square meter for a quality build. But if you are looking for excellent quality then expect to pay around £2,200 to £2,400 per square meter for a single storey.

The single-story extension cost of 4m x 5m would be £30,000 for basic quality, £38,000 for good quality, and £45,000 for excellent quality. You should keep in mind that it does not involve the cost of interior fit-out, VAT, and professional fees. If you include them too then a single storey extension cost would be between £40,000 and £60,000.

The cost can also vary depending on the area, for example, if you are living in London then it will cost significantly higher. However, it usually costs less than a 2-storey extension as it needs less steelworks and substantial foundations. On the other hand, building a double-storey extension cost less per square meter.

Cost of Interior Fit-Out

The single storey extension cost of interior fit-out depends on the rooms. However, these rough estimates can help you:

The cost of a new kitchen is around £5,000 to £20,000. If you go for high quality then the cost will increase significantly.

Depending on the fittings, the cost of a new bathroom is around £4,500 to £11,000.

When it comes to the flooring, you should add £25 to £100 per square meter to your budget.

Sliding or Bi-fold doors will cost you £1,400 to £2,200 per linear meter. It is the best option to bring it more natural light inside the home.

If you adding an additional storey to the house, then you will need to upgrade the heating system as well. It requires work by a plumber for no more than three days and will cost you around £150 per day. It does not involve the cost of the material.

The cost of underfloor heating varies. You will also need to install a new boiler to meet the demand of water-fed underfloor heating.

Project Fees

Normally, the fee of an architect is three to seven per cent of the construction cost. If the cost of the project is £60,000 then the fee of an architect will be around £1,600 to £4,200.

If you also need a structural engineer then add more £1,000 to £2,000 in your budget. You will also need planning drawings from the architectural service provider for planning Permission.

Single Storey Extension Cost For Planning Permission

The fee for planning permission in England is £206. You will also need the certificate of lawful development which will cost you £103. Bear in mind that the fee for discharging planning conditions is £34. That is why; it is important to apply with an architect or builder who is familiar with the local planning authority.