Why bungalows extend well
Bungalows often sit on generous plots, which leaves room to build out. They also usually have a large roof space, which leaves room to build up. That combination gives bungalow owners more options than most homes, from a simple rear extension to turning the property into a full two-storey house.
The right choice depends on what you need, how long you plan to stay and whether level, single-floor living is important to you now or later.
Single storey rear and side extensions
Extending at the back or side keeps everything on one level, which is ideal if stairs are, or may become, a problem. A rear extension can create an open kitchen and family room; a side extension can add a bedroom and shower room or a home office. Because bungalow roofs are low, the main design question is how the new roof meets the old one. A flat roof with rooflights keeps it simple; a pitched roof matching the existing one looks more traditional but needs more height.
Under permitted development, single storey rear extensions on a detached house can usually go up to four metres deep, or three metres on other houses, with a larger home extension prior approval route allowing more. Bungalows on open-plan estates sometimes have these rights removed, so check first.
Going up: loft and dormer conversions
A bungalow's roof space can often become one or two bedrooms with a bathroom. Rooflights suit roofs with good head height; dormers add usable floor space and are common on bungalows, sometimes along the whole of the rear slope. A staircase has to fit into the existing ground-floor layout, which often means losing part of a room or a hallway. Our loft conversion and dormer guides explain the options.
Adding a full storey
Taking the roof off and adding a second storey turns a bungalow into a house. It gives the most space but is the biggest project. The existing foundations and walls must be checked by a structural engineer to see whether they can carry the extra load; underpinning or new foundations may be needed. A new roof, a staircase and a complete upstairs layout follow. This almost always needs planning permission, and the council will look closely at the effect on neighbours and the character of the street.
Combining options
Many bungalow projects combine a rear extension with a loft conversion, so living space grows downstairs and bedrooms move upstairs. Planning and building both together means one set of drawings and one programme, and the structure can be designed as a whole.
Living in during the work
With everything on one floor, a bungalow extension can disrupt the whole home, particularly when the roof is opened up. Single storey extensions are often built with the house in use until the final knock-through. Loft conversions and added storeys need the roof protected from the weather while the work is exposed, and some households choose to move out for part of a larger job.
Cost and timing factors
The type of extension, foundations, roof work, staircase, glazing, the number of bathrooms and the fit-out all affect price and programme. Our house extension cost guide covers the main factors. Our house extensions page explains how we build extensions from foundations to finish, and we offer free estimates after a site visit.
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Questions people ask
What is the best way to extend a bungalow?
If single-floor living matters, a rear or side extension. For more bedrooms, a loft or dormer conversion. For the most space, adding a full storey, which is the biggest project.
Do I need planning permission to extend a bungalow?
Many single storey rear extensions fall under permitted development within size limits. Dormers may too, but adding a storey almost always needs planning permission.
What affects the cost of a bungalow extension?
The type of extension, foundations, roof work, staircase, glazing, bathrooms and fit-out. Combining a rear extension and loft conversion can be more efficient than doing them separately.
Can I stay in my bungalow during an extension?
Often during a single storey extension. Projects that open up the roof are more disruptive, and some households move out for part of the work.