Hip-to-Gable Loft Conversion with Rear Dormer in Barnet, North London

Detailed Planning secured a Lawful Development Certificate for a hip-to-gable loft conversion with a full-width rear dormer on Jackson Road in the London Borough of Barnet (North London). This approach maximises internal headroom while remaining within planning policy and loft conversion best practice.

Loft Conversion Barnet: Project Overview & Outcome

The works replace the existing hipped roof with a new gable end, add a flat-roofed rear dormer and introduce two conservation-style rooflights to the front elevation. Internally, the new loft level provides an additional double bedroom and an en-suite bathroom, accessed via a new staircase planned to integrate cleanly with the existing layout. With the certificate granted, the homeowner can proceed without a full planning application, unlocking valuable space and adding value to their North London home.

What Was Approved (Hip-to-Gable & Rear Dormer)

• Conversion of the hipped roof to a full gable to increase usable floor area.
• Full-width rear dormer to the main roof slope for maximum headroom.
• Two conservation rooflights to the front to respect streetscape character.
• New staircase, one additional bedroom and an en-suite bathroom.

Permitted Development Compliance for Loft Conversions in Barnet

We prepared detailed plans, elevations, sections and volume calculations to evidence that the combined hip-to-gable and dormer volumes fall within permitted development thresholds. Our submission demonstrated neighbour privacy is protected and the terrace character is maintained. For homeowners in Barnet, Finchley, Whetstone and Enfield, our expertise streamlines approvals under PD or, where required, full planning applications.

Lawful Development Certificate: Why It Matters

A Lawful Development Certificate formally confirms your loft conversion is lawful, reducing risk during construction and future conveyancing. We handle the drawings, evidence pack and application so you can build with confidence. When needed, we also coordinate building regulations approval and technical details for contractors.

Hip-to-Gable Loft Conversion Designers — North London

From early feasibility to construction-ready information, our architectural services cover concept design, measured surveys, planning/PD strategy and building regulations. Whether you’re exploring a rear dormer, mansard loft conversion or hip-to-gable upgrade in Barnet or wider North London, we’ll help you maximise space and value while navigating policy smoothly.

Areas We Cover

We regularly deliver loft conversions across Barnet, Finchley, Whetstone, Totteridge, Enfield, Muswell Hill and Highgate, as well as other North London postcodes. Considering a project? Explore our Loft Conversions in London page or read about Building Regulations to understand next steps.

Start your Barnet loft conversion today — view our full range of architectural services or get in touch for initial advice.