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What Type of Extension is Right For Your Property?

There’s more to self-build than finding a great plot and building a new home from the ground up. You can also modify your existing home or add a modern addition to a converted property.

This is becoming an increasingly popular choice with homeowners seeking more space or simply wanting to liven up an old property. In this article we will review the extension types available. If you want to add more square footage to your home, you have a lot of good options.

Building an extension onto your house can be an exciting project, but there’s hard work involved too. Once you’ve had the plans drawn up and received planning permission, you need to find a builder. Once you’ve engaged a company you feel comfortable with, the next stage of the process begins.

Here is a full range of extension types:

Porches are small and simple structures built onto the house exterior. They can be plastered or left in brick form, and they usually have a light. Most porches are exempt from planning permission requirements due to their size, but there are exceptions, especially if the porch has electrics in it. Porch extensions start at around £2,500.

Conservatories are typically made of UPVC, aluminum, or timber. Some require planning permission, others do not. Building costs start at around £4,000.

Orangeries are also known as sunrooms, and are basically conservatories with walls and a roof. Both an architectural company and a building company with appropriate experience should be engaged. In terms of planning permission, orangeries have rules similar to conservatories, and building control permission will be required. Typical costs are £12,000 and up.

Single storey extensions are an extension added to a part of the house.  They consist of a ground floor and any added basement. When building an extension, considerations include size, impact on neighbours, roof alignment with the existing building, and position of drains, flues, and excavations. Planning permission is not always required, but building permission is. Average costs start at £8,000.

Extensions with two or more storeys can also be completed without planning permission, but the added size can potentially inconvenience neighbours, so design with that in mind. This type of extension can cost upwards of £25,000.

Over-structure extensions are built over the top of an existing structure, such as a garage. These can be complicated projects because garages have single-skin brickwork and the extensions are twin-leaf. Building over a kitchen or dining room constructed in the 1960s can also be problematic due to foundation conditions. The necessity of planning permission depends on factors such as proximity to neighbours, so specialist advice is recommended.

Building control permission will definitely be needed. Costs start at around £22,000.

Modular extensions come in kit form, and can be erected in as little as five days. They are inevitably timber-based and cost £3,000 to £4,500 including VAT. Even if you use a kit, be aware that you still need to carry out the required building work such as brickwork, foundations, and a suitable roof covering.

In the case of listed buildings, extension options are limited to what the conservation officer will allow. If you live in a historic property that’s not listed, it might be a good idea to consult your planners first on recommended extension types for your property type.

Structural Insurance


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