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THE JOURNAL

Expert guides, renovation advice, cost breakdowns, and trend articles — built from real project experience across London’s most prestigious postcodes.

Luxury rear home extension in Fulham, London — bifold doors open to a landscaped terrace with fire pit seating; open-plan kitchen-living visible inside, by Sovran

Cost Guides·12 min read

Home Extension Cost London 2026: What You Will Actually Pay

A comprehensive breakdown of extension costs per square metre across London boroughs, including planning fees, structural work, and finish levels.

4 June 2026

Luxury rear home extension in Hampstead, London — full-width bifold doors open to a landscaped garden with lavender; oak kitchen and marble island visible inside, by Sovran

Cost Guides·10 min read

Loft Conversion Cost London 2026: A Homeowner's Real Guide

Real prices for dormer, mansard, Velux and hip-to-gable loft conversions in London — from a RIBA-certified London design and build team.

4 June 2026

Home extension in Holland Park, London — wisteria-clad stucco facade; glazed rear extension opening onto a landscaped garden, by Sovran

Planning·8 min read

Planning Permission for a Home Extension in London: The Complete Postcode Guide

Planning permission for a home extension in London varies sharply by postcode. A guide from a team led by former planning officers, with a 97% planning success rate.

6 July 2026

Design and build architectural model and blueprints in a Chelsea, London study, RIBA-certified planning drawings, by Sovran

Build Process·9 min read

Design and Build vs Separate Architect and Builder: Which Is Better for Your London Home Extension?

Design and build or a separate architect and builder for your London home extension or loft conversion? A RIBA-certified, 97% planning success rate team explains the trade-offs.

6 July 2026

Dormer loft conversion in Wandsworth, London — zinc-clad box dormer above a bifold-door rear extension, by Sovran

Planning·8 min read

Mansard vs Dormer Loft Conversion: Which Is Right for Your London Home?

Dormer or mansard? A side-by-side comparison of cost, space, planning permission and which London boroughs favour each type — illustrated with a real Wandsworth conversion.

20 July 2026

Loft conversion bedroom in Wimbledon, London — vaulted ceiling, exposed beams and glazed gable window, by Sovran

Build Process·9 min read

Living at Home During a Loft Conversion: A Realistic Guide

What is it really like living at home during a loft conversion? A week-by-week guide to noise, dust, access and timeline, from a team that keeps clients living in their homes throughout.

20 July 2026

Rear extension in Balham, London — single-storey brick extension with a roof lantern and full-width sliding glass doors opening onto a lawn, by Sovran

Planning·9 min read

Rear Extension London: Permitted Development Limits Explained by a Former Planning Officer

Two different Permitted Development routes, a cumulative allowance measured from 1948, and the conditions that quietly disqualify an otherwise textbook extension — explained by a team that includes former planning officers.

1 September 2026

Wraparound extension in Barnes, London — aerial view of a single-storey brick extension with a flat roof, three rooflights and full-height glazing onto the garden, by Sovran

Planning·8 min read

Side Return vs Wraparound Extension: Which Adds More Space to a London Terrace?

Side return or wraparound for your London terrace? The cantilevered roof detail that drives the cost difference, the 50% garden rule that decides the planning route, and how to tell which one your property suits.

3 September 2026

Cutaway cross-section of a London basement conversion — Type C cavity drain membrane, perimeter drainage channel and sump pump beneath a finished media room and wine store, by Sovran

Build Process·8 min read

Basement Conversion London: What BS 8102 Waterproofing Actually Means

What BS 8102:2022 actually requires, what Type A, B and C systems really do, and why London clay means most basements here need more than one of them.

7 September 2026

Basement conversion in Hampstead, London — media room with a wall-mounted screen, daylight from a rear lightwell and a glazed, backlit wine cellar, by Sovran

Cost Guides·7 min read

Does a Basement Conversion Add Value in London? The Real Numbers

Worked numbers for Fulham, Hampstead, Wandsworth and Wimbledon: what a basement conversion costs against what it adds, borough by borough, instead of a single national percentage.

10 September 2026

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