Low Pitch Loft Conversion

The pitch of a roof, meaning how steep it is, has a big effect on how much usable space is available in the loft before any building work even starts. Houses built from the 1960s onwards often have a shallower roof pitch than older Victorian or Edwardian properties, and a shallow pitch usually means less head height under the ridge, even in a loft that looks reasonably large from the outside.

On its own, a low pitch is rarely a reason to say no to a conversion, but it usually means a simple velux conversion will not give enough height, and a plan involving a hip to gable, a dormer, or a full mansard is more likely to be the right fit. Please confirm current roof pitch thresholds and head height requirements with our technical team before finalising a quote, since these figures are the sort of thing that gets checked closely at building control.

Who this for

This mostly comes up in houses built from the 1960s onwards, where roof pitches tend to run shallower than the older housing stock across London. It is worth a survey any time a homeowner has been told their roof pitch is too low, since the right combination of techniques can usually still deliver a good sized room.

Low Pitch Loft Conversion Cost

As with a low ceiling, the price of converting a low pitch roof depends heavily on which technique your specific roof needs. As a broad range, low pitch conversions in the UK run from around £15,000 for the simplest cases up to £70,000 for a more involved dormer or hip to gable approach, and if the whole roof structure needs raising to gain height, costs can climb to £70,000 or beyond £100,000. Where the ridge height comes in under roughly 2.4 metres, a straightforward velux conversion is unlikely to give enough usable space, so a dormer or mansard becomes the more realistic option, and the price moves up accordingly. If the survey shows the roof structure itself needs to be raised rather than just extended, that alone can add somewhere between £8,000 and £15,000 on top of a standard conversion cost. This is why we measure the actual pitch and head height on site rather than working from a general figure. Two houses that look like they have the same low pitch roof from the street can need very different levels of work once you look at the numbers, so the survey genuinely changes the quote here more than it does for most other conversion types. Get in touch for a free survey and we will tell you honestly which approach fits your roof, and what it is likely to cost, before any commitment on your part.

Project Process Steps