Written by the Loft Life team, who have surveyed and converted lofts across London and Kent for more than 25 years. Last updated 25 June 2026. Read time: ~8 minutes.
Can my loft be converted? In most cases, yes, provided there’s at least 2.2 metres of headroom at the highest point, measured from the floor to the underside of the ridge. Head height is the single biggest factor. Your roof type, the pitch of the slope, and the position of water tanks or chimney stacks decide the rest. A free survey confirms whether your loft works in under an hour.
How Do I Know If My Loft Is Suitable for Conversion?
Three checks tell you most of what you need to know. Measure the head height from the floor to the highest point of the roof. Look at how the roof’s built, either as open rafters you can stand between or a web of angled timbers. Note any obstructions such as a chimney breast, a water tank, or a low purlin running across the space. If you’ve got decent height and an open roof structure, your loft is almost certainly convertible.
How to Tell If Your Loft Can Be Converted: A Quick Checklist
If you tick most of these, you’re in good shape. If one or two are uncertain, that’s exactly what the survey settles.
The Minimum Height for a Loft Conversion, Explained
Minimum head height is the vertical distance from the finished floor to the underside of the ridge, and it’s the first thing that decides whether a loft can be converted. There’s no figure written into building regulations that says the loft itself must be a set height before work can start. The 2.2m guide comes from what works in practice.
Below roughly 2.2m at the ridge, a standard conversion becomes difficult. That’s because Approved Document K of the building regulations sets a minimum head height of 2 metres over the staircase, and you lose height fast as the roof slopes down toward the eaves. You can read the full standard in the government’s Approved Document K.
To measure your own loft, run a tape from the floor straight up to the underside of the ridge board at the highest point. Anything from 2.2m upwards is promising. At 2.4m or more you’ve got comfortable standing height across a good portion of the floor, which makes for a far more usable room. If you’re close to the line, that’s exactly what the survey is for.
How Your Roof Type Affects Whether Your Loft Can Be Converted
Roof type is the second deciding factor, and the way your roof was built matters as much as the height.
Traditional Cut Roofs in Older Homes
Homes built before the 1960s usually have a cut roof, assembled on site from individual rafters and purlins. This leaves the central space open, which is ideal for a conversion. Most period terraces and semis across Lewisham, Dulwich, Bromley and the Kent towns fall into this group, and they’re the easiest properties to work with.
Modern Trussed Roofs in Newer Homes
Homes built from the 1960s onward often use factory-made trusses, a web of W-shaped timbers that fill the loft. These can’t simply be cut out, because they hold the roof up. A conversion is still very possible, but it needs steel beams installed to take the load before the trusses are removed. This is routine work for a specialist team, so a trussed roof doesn’t rule you out. It just changes the method.
What to Do If Your Loft Has Low Head Height
Falling short on height doesn’t end the project. There are three proven routes to gaining the room you need.
The first is lowering the ceiling of the floor below, which adds height to the loft from underneath. The second is raising the roof or rebuilding the ridge higher, which is a bigger job but transforms a cramped loft. The third, and most common, is a dormer or hip to gable conversion, which extends the roof outward to create full standing height across a much larger area. A survey will tell you which option gives the best result for your home and budget.
Do You Need Planning Permission to Convert a Loft?
Many loft conversions go ahead under permitted development and don’t need a planning application at all, as long as they stay within set volume limits and design rules. If you’re in a conservation area, or your home has already been extended, the rules can be tighter and you may need full consent. Even under permitted development, it’s worth applying for a Lawful Development Certificate as proof the work was allowed, which matters when you sell. The current rules are set out on the Planning Portal’s loft conversion page. Either way, every conversion must still meet building regulations.
Other Things That Affect Loft Conversion Feasibility
A chimney breast can usually stay or be removed, depending on whether it’s still in use. A cold water tank in the loft is easily relocated when the heating’s updated. The position of the new staircase needs thought, since it has to land sensibly on the floor below without eating into a bedroom. If you share a wall with attached neighbours, the work may fall under the Party Wall Act 1996, which means serving notice before building starts. None of these are dealbreakers on their own. They’re simply the details a good survey works through so there are no surprises later.
Why a Survey Beats Guessing
You can get a long way with a tape measure and the checklist above, but the gap between “probably” and “definitely” is where projects go wrong. A surveyor who does this every week reads the roof structure at a glance, spots the steel that a trussed roof will need, knows where the stairs can realistically go, and understands the planning position for your specific street. That’s the difference between a rough guess and a fixed plan you can build from.
It also means you find out about anything tricky before you commit, not halfway through. If your loft needs a dormer to gain height, or a steel to replace trusses, you’ll know the cost and the method up front. There’s no value in a survey that tells you what you want to hear, so we’d rather give you the honest picture and a price you can rely on.
Frequently Asked Questions
What is the minimum ceiling height for a loft conversion in the UK?
As a working guide, you want around 2.2 metres from the floor to the highest point of the roof. There’s no fixed legal minimum for the loft itself, but Approved Document K of the building regulations requires 2 metres of head height over the staircase, and you lose height as the roof slopes down. Anything from 2.2m upward usually allows a comfortable conversion.
Can a bungalow loft be converted?
Yes, bungalows are often excellent candidates because the whole roof space is available. The main things to check are head height and roof type. Many bungalows have generous roof volumes that make for large, light rooms once converted. We cover this in more detail in our guide to loft conversions for bungalows.
Can you convert a loft with a low roof?
Often, yes. Where head height falls short, the roof can be raised, the ceiling below lowered, or a dormer added to create the height you need. The right approach depends on the property and the result you want, which is something the free survey is designed to confirm before any commitment.
Do all loft conversions need building regulations approval?
Yes. Planning permission and building regulations are two separate things. A conversion may not need planning permission if it falls under permitted development, but every loft conversion must meet building regulations covering structure, fire safety, insulation and the staircase. We handle the building control application and sign-off as part of the work.
How much does it cost to find out if my loft can be converted?
Nothing. Our survey is free and carries no obligation. A surveyor checks the head height, roof structure, staircase position and planning route, then tells you whether your loft works and what type of conversion suits it best. You only spend money if you decide to go ahead.
Find Out for Certain With a Free Survey
The only way to know for sure whether your loft can be converted is to have someone who does this every week take a proper look. Our free, no obligation survey covers head height, roof structure, where the stairs can go, and any planning or building control points specific to your street and property.
You’ll get a clear answer on whether your loft works, what type of conversion suits it best, and a fixed price so the figure never moves once the job starts. Sometimes the answer’s straightforward and the loft is ready to go. Sometimes it points to a dormer or a roof alteration to gain the height, and we’ll tell you that honestly rather than promising something the space can’t deliver.