What is a hip to gable loft conversion? (2026 guide)
If your loft feels too cramped and awkward to convert with a simple roof light, a hip to gable conversion is often the answer. It is one of the most effective ways to unlock real, usable space in a roof that slopes on the side. As FMB-registered builders with over 20 years of experience in Solihull and the West Midlands, we carry out hip to gable conversions from the structural work through to the finished room, and this guide explains what they involve and cost.
What is a hip to gable loft conversion?
Many homes have a hipped roof, which means the roof slopes inward on the side as well as the front and back, coming to a point or ridge. That sloping side eats into the loft and leaves an awkward, low corner. A hip to gable conversion replaces that sloping hip with a vertical gable wall, effectively squaring off that side of the roof. The result is a much larger internal volume that can be turned into a proper room.
How much does a hip to gable loft conversion cost?
The ranges below give a realistic guide for Solihull and the wider West Midlands.
| Project | Indicative cost |
|---|---|
| Hip to gable conversion | £45,000 to £70,000 |
| Dormer loft conversion | £40,000 to £65,000 |
| Roof light conversion | £28,000 to £45,000 |
Figures are indicative UK ranges to help you budget and are not a quote. Actual costs depend on size, specification and site conditions.
See our full guide to loft conversion types for how this compares with the other options.
Is my house suitable for a hip to gable conversion?
Hip to gable conversions suit detached and semi-detached homes that have a hipped roof. An end of terrace home with a hip can also be a good candidate. The key thing is that there needs to be a hip to convert in the first place, so a house with a gable end already on both sides would not benefit. During a free site visit we look at the roof shape, the available head height and where a staircase can go, and tell you honestly whether it is the right approach.
How much extra space does a hip to gable conversion add?
Filling in the sloping corner adds a surprising amount of volume, which is why this type suits homes where a simple conversion would leave the room too tight. On its own, a hip to gable creates a noticeably larger loft. In practice it is often combined with a rear dormer, which adds head height and floor area at the back, and the two together create enough room for a genuine double bedroom with an en-suite rather than a small, low box room.
Why combine a hip to gable with a rear dormer?
The hip to gable widens the usable footprint by squaring off the side, while a rear dormer raises the ceiling and adds floor space at the back. Used together they complement each other, turning an unpromising loft into a comfortable, full sized room. This combination is a common recommendation for semi-detached homes in the area.
Does a hip to gable conversion need planning permission?
Hip to gable conversions are often permitted development, but this depends on the property and the size of the change, and homes in conservation areas usually need planning permission. Every loft conversion needs building regulations approval regardless. We confirm the position for your home and manage the whole process. You can also see examples of our work on our case studies page.
Does a hip to gable conversion add value?
A hip to gable conversion adds value in the same way as other loft conversions, by creating an extra bedroom and usually an en-suite. Because it produces a larger and more usable room than a simple conversion, it tends to add strong value on the semi-detached and detached homes it suits. As always, the uplift depends on the standard of the work and how well the new space fits the house, so quality of build matters.
What is it like to live through the work?
Most of a hip to gable conversion happens up at roof level, so day to day disruption inside the home is usually limited until the new staircase is formed. There will be noise during working hours, scaffolding outside and some dust when the internal opening is made, but a considerate team keeps the work area sealed and tidy. We agree sensible working hours with you and keep you informed at each stage.
How long does a hip to gable conversion take?
Most hip to gable conversions take around seven to nine weeks on site, a little longer when combined with a dormer, depending on the specification. Explore our full conversions service to see everything we offer.
Get a free quote
Every project is different, so the most reliable way to get an accurate price is a free, no obligation site visit. As FMB-registered builders based in Solihull, we will talk you through your options and give you a clear, itemised quote.
Call 07393 194 336Get a free quote