Loft Conversion Cost in Hendon: 2026 Price Guide

A loft conversion is one of the few ways to add a genuine extra bedroom in Hendon without extending outward - a real advantage given how much family houses here command, and how disruptive moving actually is. The taller Victorian and Edwardian terraces typical of the area lend themselves well to it.

Typical costs

• Rooflight (Velux) conversion: roughly £30,000-£45,000
• Dormer conversion: roughly £45,000-£65,000
• Mansard or hip-to-gable conversion: £65,000-£90,000+

Adding an en-suite, structural steels for an open-plan layout, or a staircase reconfiguration will all add to these figures.

What affects the price locally

Before anything else, a builder in Hendon will check roof pitch and head height. The steeper pitches typical of the area's Victorian and Edwardian terraces are actually an advantage here, often needing a smaller dormer to hit a comfortable head height than a shallower roof would. The 1930s semis further out tend to have more standardised roof structures, which usually means a more predictable quote.

If your property sits within the Hendon The Burroughs and Hendon Church End conservation areas, expect closer scrutiny of how a dormer or roof alteration is seen from the street - the London Borough of Barnet planning officers generally prefer conversions that aren't visible from the front elevation, which is one reason rear dormers are the default choice in this area.

Planning permission and party walls

Most loft conversions in Hendon can be done under permitted development, provided the additional roof volume stays within set limits and materials match the existing house. Because most of the housing stock here is terraced or semi-detached, a Party Wall Agreement with your neighbours is usually required before work starts - it's worth budgeting time for this, as it can add several weeks to the start date.