What Is a Hipped Roof?

February 12, 2026

When planning a home improvement project, many London homeowners explore ways to maximise space without dramatically altering the character of their property. One popular and highly effective solution is a hipped roof extension. At Simply Extend, London’s leading home extension specialists, we regularly design and build hipped roof extensions that add valuable space while blending seamlessly with existing architecture.

Before understanding the extension, it helps to know what a hipped roof is. A hipped roof (or hip roof) slopes down on all sides, usually at a gentle angle. Unlike a gable roof, which has two sloping sides and vertical ends, a hipped roof has no flat vertical ends. This design is common on semi-detached and detached homes across London, particularly 1930s properties.

Because the roof slopes inward on all sides, the loft space underneath can feel restricted. That’s where a hipped roof extension comes in.

What Is a Hipped Roof Extension?

A hipped roof extension – often called a hip-to-gable extension – involves extending the sloping side of a hipped roof to create a vertical gable wall. In simple terms, the angled side of the roof is built up to form a straight wall, extending the ridge line and creating significantly more internal space.

This type of extension is most commonly carried out as part of a loft conversion. By converting the sloping hip into a vertical gable, you increase headroom and usable floor space within the loft. The result is a much larger, more practical room, ideal for an additional bedroom, home office, or en-suite.

Why Choose a Hipped Roof Extension?

One of the main reasons homeowners choose a hipped roof extension is to maximise space without extending outward into the garden. In areas where outdoor space is limited, building upward is often the smartest option.

Key benefits include:

Increased internal space: The new vertical wall creates more head height and usable floor area.
Improved property value: Adding an extra bedroom or bathroom can significantly boost your home’s market appeal.
Seamless design: When professionally designed, the extension blends naturally with the existing roofline.
Planning efficiency: Many hipped roof extensions fall under permitted development, although this depends on the property and location.

For semi-detached or end-of-terrace houses in London, this type of extension can dramatically transform the upper floor without changing the footprint of the home.

Planning and Structural Considerations

While a hipped roof extension may appear straightforward, it requires detailed structural planning. The existing roof structure must be carefully altered, and new supports installed to maintain integrity and safety. At Simply Extend, our experienced team manages every aspect — from architectural design and planning applications to structural calculations and construction.

We ensure all work complies with building regulations and integrates perfectly with the rest of your property. Matching materials, roof tiles, and exterior finishes is essential to achieve a cohesive look.

Is a Hipped Roof Extension Right for You?

If you own a semi-detached or detached property with a sloping side roof, a hipped roof extension could unlock significant unused potential. It’s an efficient way to gain extra living space without sacrificing your garden or undertaking a full rear extension.

At Simply Extend, we specialise in designing and delivering high-quality roof and home extensions across London. If you’re considering expanding your home, our expert team can advise whether a hipped roof extension is the right solution for your property — and guide you through the process from concept to completion. Call us today on 0800 917 7571 to book your FREE site survey.