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Single Storey Extensions Costs

Material Costs, Labour Fees and Time Frame Estimates for Single Storey Extensions

When constructing a single storey extensions for your home, note that the overall costs can vary significantly depending on a variety of factors like the extension size\e and your preferred finish. Rear extensions featuring open plans with large windows made of glass are quite popular these days. These windows tend to be expensive with costs running at about £1000 to £1500 a square metre. Also, if you’re wondering about the cost difference between an extension that is 25 square metres to a 30-square metre one is around £5000. 

How you’re going to use the single storey extensions is also something that needs to be factored into the overall cost. It’s common for homeowners to use extensions to the side and the rear as kitchens. This comes with other associated costs totalling to at least £3000. If you intend to convert the extension into a living room, you may need new furniture pieces. If you want a bathroom to be incorporated into the extension, expect the costs to run between £1000 and £10000. 

Cost Breakdown

For single storey extensions at 25 square metres, expect the total cost to be around £30000. Of that, £15000 covers the materials, £13500 pays the tradesmen and £1500 covers the costs for waste removal. 

Timeframes and Labour Costs

Most tradesmen will charge a daily average rate of £150 to £250 for extension projects. Expect them to work at least in pairs. However, during the stage where excavation and the actual building is done, there may be as many as six people on site. Also, expect a variety of trades to be involved with the project. A structural engineer and an architect may be necessary for the planning permission applications. They will also ensure that the necessary building regulations are followed to a tee. 

You’ll also need roofers and builders. You’ll also have to hire an electrician, a heating specialist as well as a power to ensure that your energy and power requirements are duly addressed. Also, expect to pay for the services of a decorator, plasterer, floor fitter and tiler. 

Generally, it would take up to 2 months for single storey extensions project to be completed. 

What Does the Project Entail?

If space is an issue in your home, you usually have two choices to address the problem— look for a bigger property or have the property extended. Moving can be quite costly and not a lot of people are prepared to deal with the hassle involved as well. So, if you decide that an extension is the better choice, understanding what’s involved, especially where costs are involved is essential. 

The building cost for this project can also be affected by the size, type and location of your extension. Many people often consider extensions as a more cost-effective option to avoid having to go through the rather taxing process of selling your property and then buying a new and bigger one. 

Start by determining how much your budget is. Know exactly how much you can afford and be realistic with the figures. Take note of additional costs including fittings and other fixtures, professional fees, as well as budget for decorating. It is always best to set aside a contingency fund of about 10% of your total number if there may be a need for you to cover extra, unforeseen costs. Also, check with the local authority to determine whether planning permissions are needed. 

If planning permission is needed, refer to an architect to have it drawn up. You’ll also need to find a builder so make sure to find a reputable one. Personal recommendations from people you know who have hired one recently is always a good starting point. Ask for a written quote and if you can, shop around and compare at least three quotes before making a decision. 

If planning permission isn’t needed, see to it still that the project meets specific building regulation standards to secure approval. See to it that your builder will meet all the necessary standards so when checks have to be made, it will be easy enough to have the project signed off by building inspectors later. 

Reducing Costs

It is important to understand that despite how simple this project may seem to be, it is not something appropriate for a DIY. However, if your concern is to minimise the costs, there are some things that you can. For instance, excavation for the foundation can be done DIY so you may want to consider doing it yourself. Once the skin is in place, you can have a handyman do the flooring, decorating, tilling as well as adding blinds. However, do see it that professionals are hired to take care of getting the plans drawn, installing the roofing as well as the plumbing, plastering and electrics to avoid unnecessary mistakes or even more costly repairs. 

Most problems generally boil down to cost-cutting and poor planning. Also, it’s not enough that you have the plans drawn by professional architects, make sure that you hire the right professional builders to carry out the construction as well. Hiring the cheapest builders will only end up with a project that is likely not going to last you long down the road.

Can the Construction Increase My Property Value?

Increasing your living space is a great way of increasing your home’s potential value. While single storey extensions increase the overall square footage of your home’s living space, make sure to look into the ceiling price and the house’s worth. Remember, people will likely go for the smallest house located in the best street instead of going for the biggest house in a rather shady street. It might help to check ceiling price estimates for your property before you decide.

Do consider the extension’s relative cost as well. Costs are going to increase if the construction is a bit more complicated. Remember that the best way to ensure that the extension will increase your home value is when it is being done by the experts. Cowboy extensions are only likely going to end up reducing your property’s value. 

Planning Permission and Building Regulations

There is no need to apply for planning permission if the extension meets the necessary criteria.

  • The extension’s highest point doesn’t go over your house’s highest point.
  • The extension ground area doesn’t exceed half of your property’s total area.
  • The eaves don’t go beyond 3 metres in height for extensions situated within a 2-metre distance of your property’s boundary.
  • It shouldn’t go beyond 4 metres beyond the back wall of your home or 3 metres if your house is terraced or semi-detached.
  • It shouldn’t go beyond walls that face the road, especially if it’s part of the side or principal elevation of the property.
  • Materials used are the same as the materials that were used in your existing property. 

If your home is a listed property, a Listed Building Consent is usually necessary for the extension to push through. So, while you don’t usually need planning permission for a single-storey extension, it might be best to refer to the authorities if you’re not quite sure. It does need to comply with specific building regulations so make sure that your builder will submit the necessary application to the building control department in your locality. 

Single or Two-Storey Extension

While a two-storey extension can offer more living space, it is likely to become more of a nuisance to the neighbours and planning permission will also be required. Meanwhile, you’ll have less hassle with single storey extensions since they usually come under permitted development. Extensions with two storeys are going to add more value to your home. However, they will also cost more. 

Still, assuming that you have the money to spare, double extensions may be the better choice. However, note that securing the planning permission is not only default, but it is also expensive and it time-consuming too, especially if you have neighbours who aren’t pleased with the idea. Most people would rather go for a single extension due to it being quicker and easier to construct and where no planning permission is necessary. It could cost around £17000 for a single extension to be constructed while a two-storey once is likely to cost you between £30000 and £40000.