House Extensions & Loft Conversions in Putney & Wandsworth

LCCL Construction is a design and build company based in Finchley N3, working in Putney & Wandsworth. One team, one contract: architects, structural engineers, project managers and builders coordinated by LCCL take your project from first sketch to handover.

Putney, Southfields and Wandsworth Town are Victorian and Edwardian terraces — side returns, rear extensions and rear or L-shaped dormers — with larger houses towards Putney Heath for wraparound extensions and full renovations.

What it costs in Putney & Wandsworth

The final figure depends on postcode, access and site conditions — the instant estimate applies your area. Guide ranges for 2026, design and build inclusive (architecture, structural engineering, planning or LDC, construction, project management and building control). Every project is surveyed and priced individually.

• Velux loft: £32,400 – £50,400 inc. VAT (£27,000 – £42,000 + VAT)
• Rear dormer loft: £56,400 – £80,400 inc. VAT (£47,000 – £67,000 + VAT)
• L-shaped dormer: £58,800 – £98,400 inc. VAT (£49,000 – £82,000 + VAT)
• Hip to gable: £60,000 – £114,000 inc. VAT (£50,000 – £95,000 + VAT)
• Mansard: £76,800 – £148,800 inc. VAT (£64,000 – £124,000 + VAT)
• Rear extension: £42,000 – £90,000 inc. VAT (£35,000 – £75,000 + VAT)
• Side return: £42,000 – £93,600 inc. VAT (£35,000 – £78,000 + VAT)
• Wraparound: £72,000 – £153,600 inc. VAT (£60,000 – £128,000 + VAT)
• Double storey: £90,000 – £198,000 inc. VAT (£75,000 – £165,000 + VAT)

Kitchen on top of the structure, supplied and fitted: +£9,000 – £87,360 inc. VAT (£7,500 – £72,800 + VAT) depending on size and specification. Basements: cellar refit £54,000 – £114,000 inc. VAT (£45,000 – £95,000 + VAT), lowering £114,000 – £216,000 inc. VAT (£95,000 – £180,000 + VAT), new dig £216,000 – £360,000 inc. VAT (£180,000 – £300,000 + VAT)+. New build: £2,200 – £4,500 per sqm (zero-rated for VAT).

Recent LCCL projects near Putney & Wandsworth

Glendarvon Street, Putney SW15 — rear kitchen extension

A Victorian terrace in Putney with a single-storey rear extension: an open-plan kitchen-diner with a marble island, skylights run the length of the kitchen and bifold doors onto a landscaped garden, plus a new WC and pantry tucked into the old footprint and the front reception refitted.

See the project

Also nearby: Westleigh Avenue, Putney SW15 (dormer loft, 2024) · Chipstead Street, Fulham SW6 (basement, loft conversion, rear extension, renovation, 2024).

Planning in Putney & Wandsworth

Wandsworth is, in our experience, one of the more helpful councils at pre-application stage. Conservation areas in Putney (West Putney, Putney Embankment) and Wandsworth Common need planning permission for roof changes; elsewhere permitted development usually applies.

Permitted development in Putney & Wandsworth: what goes ahead without a planning application

Usually permitted development. Wandsworth’s Article 4 directions are street-specific — 15–36 Commondale, 23–67 Westover Road, Wandsworth Common West Side and the Heaver Estate — so on the ordinary Victorian and Edwardian streets of Putney and Wandsworth, lofts and single-storey rear extensions go ahead without a planning application. Flats and maisonettes have no permitted development rights, whatever the street, and inside any conservation area a dormer or roof enlargement needs a planning application even where a single-storey rear extension within the limits does not.

On a house outside those streets, a rear dormer loft (40 m³ on a terrace, 50 m³ on a semi or detached house), a hip-to-gable, a single-storey rear extension of 3 m (4 m on a detached house) and a side-return infill are permitted development, and we apply for a Lawful Development Certificate on every one so the position is confirmed in writing. See our fixed-price permitted development projects — from £32,400 inc. VAT (£27,000 + VAT) for a Velux loft and £42,000 inc. VAT (£35,000 + VAT) for a 3 m rear extension, design and build inclusive, postcode dependent. Not sure whether your project needs a planning application?

Planning check

Conservation areas and Article 4 directions in Putney and Wandsworth

Wandsworth has 46 conservation areas. In Putney the main ones are West Putney (designated 1986, appraisal 2010 — Victorian to the north and east, Edwardian in the centre, south and west), East Putney, Putney Embankment, Putney Heath, Putney Lower Common, Deodar Road and Landford Road; around SW18 they are Wandsworth Common (1986), with its two- and three-storey Victorian and Edwardian terraces and semis, and, in SW11, and, in SW11, Battersea Park (1988) and the Shaftesbury Park and Latchmere estates. Article 4 directions here are street-specific rather than area-wide: 15–36 Commondale in Putney Lower Common (confirmed 19 October 2000 — extensions, roofs, porches, hardstandings, fences and painting visible from the road), 23–67 Westover Road (20 July 2000) and 62–72 Wandsworth Common West Side (2001) on Wandsworth Common. Elsewhere in a conservation area, front-facing replacement windows stay permitted development but roof, side and two-storey rear extensions need planning permission; outside the areas — most of the SW15 and SW18 terraces — lofts and rear extensions go through on a Lawful Development Certificate.

The rules Wandsworth applies

Wandsworth’s Local Plan (adopted 19 July 2023) deals with extensions under policy LP5 and basements under LP6, supported by the Housing SPD (November 2016), which keeps the guidance qualitative: extensions subordinate to the house and two-storey extensions sited away from the neighbour’s boundary (paras 4.21–4.23), with daylight judged against the BRE Site Layout Planning guide (4.22) rather than a fixed 45-degree rule — we design to the 45-degree line anyway. The basement guidance (June 2015) keeps at least half the front garden, a front lightwell leaving 2 m, at least half the depth of the rear garden and 1 m of soil over the basement, rules out multi-level basements, and requires a Construction Method Statement by a chartered engineer for listed or heritage sites.

Fees and timescales

A householder application costs £548 (from April 2026, plus the Planning Portal charge) with an eight-week decision period. Wandsworth is one of the lowest-cost boroughs for advice: written householder pre-application advice is £146 (2026/27), a meeting £293 or both £439, and there is a free duty-planner email service answered within 20 working days. Party wall notices run alongside planning: two months’ notice for works to a shared wall, one month for excavations within 3 m or 6 m of a neighbour’s foundations.

Building control

Building control is the shared Richmond and Wandsworth service. We use the council inspector on every project and book each inspection from foundations to completion, handing you the completion certificate at the end of the job.

Anderson's advice: use pre-application advice where the council engages

Wandsworth planning is much more helpful on pre-application than Islington in our experience. Where a council engages, a pre-app saves weeks; where it does not, a well-argued application with precedent cases works better.

What our clients say

“Alex is super professional and on the ball at all times. He always thinks ahead and won't let you down. All his teams, from bricklayers, carpentry to electrics, roofing, tiling, painting, flooring and plumbing are excellent and hard working. They are all friendly yet professional. They are conscientious and want the job to be well done.”

— Ludovic, Reviews.io

As LABC Building Excellence Award winners in 2024 (Best Residential Extension in London) and 2026 (Best Conversion or Alteration to an Existing Home, Weech Road NW6), every project is delivered by one team of architects, structural engineers, project managers and builders. Workmanship is guaranteed for 12 months from practical completion, with a 10-year LABC structural warranty.

Nearby areas

Putney & Wandsworth is part of our South West London guide. Nearby areas: Fulham, Clapham, Richmond, Wimbledon.

To book a free consultation call LCCL Construction on 020 8037 7332 or get an instant estimate online. Get an instant estimate or book a free consultation.

One team, one contract, one point of contact — from first sketch to handover.

Extending a Putney terrace? Our guide to fixed-price side-return and rear extensions in Putney SW15 covers the permitted development limits, the Wandsworth conservation-area checks and the shared-drainage point that catches people out.