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Bungalow extension cost guide
by
Checkatrade

Why should I extend my bungalow?

Bungalows are no longer seen as just for older homeowners with limited mobility. In fact, they are now becoming more and more popular with younger people due to their excellent development potential. If you want to increase the value of a home quickly, one great place to start with huge potential is a bungalow.

With a bungalow extension you can increase floor space, increase room size, add room height, create an open plan layout, change the current room layout, add character and property value and even add an extra floor. There are opportunities in every direction and to suit every need.

How much does a bungalow extension cost?

Type of extensionCost + VAT
(Range low - high)
Average cost
Single storey bungalow extension costs (per m2)£1,250 - £2,500£1,875
Dormer bungalow extension cost (Based on 30m2)£37,500 - £60,000£48,750
Bungalow loft extension cost (Based on 50m2)£65,000 - £125,000£95,000
Bungalow roof extension costs (Based on 20m2)£25,000 - £40,000£32,500
Extension planning drawings cost£750 - £1500£1000

For a breakdown of each cost we spoke to the online estimators at My Build Estimate – a professional estimating company monitored by the Royal Institute of Chartered Surveyors (RICS). This guide features the estimated bungalow extension cost examples they provided.

When calculating the average costs one important consideration is whether to extend upwards or outwards. The costs in the following table give examples of both these choices.

For the prices in this guide, we have considered the following:

  • The costs are based on standard construction.
  • Costs are based on concrete tiles.
  • No allowance for slates.
  • No allowance for special roof finishes e.g. lead/zinc/aluminium.

With these factors in mind, the average single storey bungalow extension cost is £1,875 per m2.

With regards to how this compares with a typical house extension cost, extending outwards has a similar price to any single storey extension, and extending upwards will be similarly priced to a loft extension. For further information regarding typical home extension costs and factors, view our house extension cost guide.

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Bungalow extension in progressDormer bungalow extension cost

A dormer extension is added to the roof of any bungalow or house. It protrudes from the slope of the roof to give extra floor space and is often known as creating a floor and a half bungalow. If done well it can be a stunning feature for any home, and a window is often added to allow extra light to flow into the new space. Planning permission is not usually necessary.

The average dormer bungalow extension cost is £48,750 based on 30m2.

Bungalow loft extension cost

The loft of a bungalow is an opportunity waiting to happen and most homeowners do not make the most of this space. Providing the loft is at least 2.3m high, the roof will not need to be lifted, so you can conduct a loft conversion, which is cheaper than a full extension. It may be necessary to strengthen the current beams in the loft and if adding a bathroom, plumbing will need to be installed at an additional cost.

The average bungalow loft extension cost is £95,000 based on 50m2.

Single storey bungalow extension costs

A popular way to extend a traditional bungalow, single storey extensions are added onto the side, rear or occasionally the front of the bungalow. A single storey extension is perfect for adding extra rooms or extending current rooms. Bungalow rear extension costs and bungalow side extension costs per m2 are very similar, whilst front extensions can cost more and have additional planning permission challenges.

The average single storey bungalow extension cost is £1,875 per m2.

Bungalow roof extension costs

In general, extending the roof of a bungalow involves adding an extra half a storey, bringing the total bungalow height to 1 and a half storeys. When you require more head space it is possible to lift the current roof of your bungalow to the full height of a two-storey house. This may extend over the entire bungalow or a smaller section but can greatly improve the aesthetics of your home.

The average bungalow roof extension cost is £32,500 for a 20m2 area.

Completed bungalow extensionFactors affecting bungalow extension costs

It is essential to consider several factors when calculating your exact bungalow extension cost. The following factors (listed below) may increase or decrease the average costs we have listed in this guide:

  • Architect and structural engineer fees: Depending on the scope of your new extension it may be necessary to hire an architect or structural engineer to draw up detailed plans and help you make the most of your new space. Costs can be found in our guide to architect fees.
  • Size: A general rule of thumb is that the bigger your extension, the bigger the overall cost.
  • Quality of materials: When planning your bungalow extension choosing higher quality materials will increase the quality of the job at an additional cost.
  • Groundworks: When extending a single storey, new foundations and groundworks will need to be excavated and depending on the work required the cost will vary.
  • Stairs, windows and doors: Adding windows and doors is essential for access and to allow light and fresh air into the new extension. If adding an extra floor, the cost for stairs will need to be factored in too.
  • Purpose of the room: Whether your room will be used as a bathroom or kitchen will also raise the extension cost due to the need for electrics and plumbing installation.
  • Plastering and decorating: Once your bungalow extension is complete you may choose for a professional to plaster and decorate the new space, this will incur an extra cost.

Planning permission and building regulations

Very much dependent on the type, location and size of your extension, it may be necessary to obtain planning permission so you should explore this with your local authority. Until you have planning permission you should not begin your new bungalow extension. In addition to this, any new extension space created must adhere to building regulations. These are in place to protect the safety of yourself and the building.

How long will a bungalow extension take?

In general, a single storey extension will typically take from 3 – 4 months, although you should factor in for the possibility of delays due to unexpected problems.

Can I build a bungalow extension myself?

Building an extension is by no means a simple job, it is difficult and extremely hard work. Even professional tradespeople work in a team and take months to complete a bungalow extension. It is vital that anyone undertaking a project as big as this has the correct training otherwise you put the health and safety of yourself and others at risk.

In addition, extensions must comply with building regulations and unless you have experience with this kind of job, the quality of the extension will be nowhere near that of a professional.

We would strongly recommend you hire a professional. To find a local, reputable, tradesperson in your area and get a personalised bungalow extension cost use our free search feature.

Key takeaways for bungalow extensions

  • Loft, dormer, rear and side are all types of bungalow extensions.
  • The bungalow extension cost is affected by factors such as size, location and quality of materials.
  • Usually bungalow extensions take 3 – 4 months.
  • Planning permission may be necessary and building regulations must be complied with.
  • Building a bungalow extension is time consuming, difficult and dangerous unless completed by a fully trained professional.

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