Loft conversion in Chiswick

Test the roof space before settling on a layout.

Start with the loft conversion brief

A measured roof survey should establish headroom, structural spans and where a staircase could meet the floor below. Plan the stair, escape route, insulation and building services together before treating the loft as another room.

Compare the proposed roof shape with the address-specific design guidance below. Record chimneys, shared walls and neighbouring rooflines, then ask the appointed designers to identify the structural work and consents the proposal needs.

The local building context

Designated on 7 November 1968 and extended in 2001, the Strand on the Green Conservation Area is, in its appraisal’s words, essentially a half-kilometre curve of houses of irregular heights, sizes and colours fronting the Thames. The appraisal, adopted in October 2018, finds its interest in a tranquil waterside setting of fishermen’s cottages, boat builders’ sheds, public houses and maltings, joined by larger houses in the late eighteenth century, and the area also takes in modest Victorian and Edwardian terraces. It dates Ship Cottage, Grade II, to 1694, the oldest building on the Strand; Zoffany House is Grade II*.

Grove Park was designated on 11 January 2002; its appraisal says some properties first included in the Strand on the Green Conservation Area in 1968 were transferred to it, and calls it Chiswick’s first large Victorian housing estate, planned for large mansions and recreational areas. On Grove Park Road, Nos. 17–35 and 47–57 (odd) are 1870s Italianate houses of yellow stock brick with stucco, mostly locally listed; most on the south side are two-storey semi-detached houses of the early 1930s, and Nos. 8–18 (even) are flats. Locally listed Hartington Court is a streamline moderne design of 1938.

A W4 postcode and the name Chiswick are labels, not legal tests. They cannot tell you which planning authority deals with an application, whether the house sits inside a conservation area boundary, whether it is on the statutory or local list, or what consents the work requires. On Woodstock Road the answer can change across the street, because the west side is in Ealing and the east in Hounslow, whose Article 4 schedule stops at its own boundary, and the Old Chiswick appraisal describes Chiswick Mall stretching east into Hammersmith, a different borough. Work from the house number: the council’s appraisal maps, Hounslow’s Article 4 schedule and both lists, then turn to the title or lease and to past planning decisions on the property.

Local design and consent context

Hounslow’s Article 4 page says its A4D.1 directions cover all properties in the Bedford Park and Gunnersbury Park conservation areas, and the householder leaflet says the properties shown in the schedules are affected and that the directions were confirmed on 24 July 2001. Where development fronts a highway or open space, they bring extensions, new windows or altered window openings, cladding and front vehicle hardstandings under planning control, and the leaflet also lists porches, boundary walls, gates and fences and exterior painting. Demolishing, building or altering a chimney stack needs permission too, but like-for-like repairs do not.

The leaflet adds that dormers are acceptable only at the rear, in traditional designs, where they already prevail, and that a renewed roof needs natural slate or clay tiles where that was the original material. The Bedford Park schedule lists the affected properties street by street, from Abinger Road, Addison Grove and Blenheim Road to Priory Avenue, Roman Road and Woodstock Road, where its entries begin at No. 44. The direction is Hounslow’s, so it covers only Hounslow’s side; for the western part, Ealing’s consultation records existing Article 4 directions dated 1970, 1985 (listed buildings) and 2008 (specific properties).

The Character, Sustainability and Design Codes SPD, adopted on 14 May 2024, supersedes the 2017 Residential Extension Guidelines. Its Part A5 gives maximum single-storey rear extension depths of 3.05m for a terraced house and 3.65m for a semi-detached one, measured from the original rear wall, says front dormers will generally be refused, opposes new basements to listed buildings in principle and asks you to read the individual appraisal alongside it. Part B10 adds a vision and neighbourhood guidance for Chiswick.

Access and site planning

Hounslow says Hounslow Highways issues the licences for temporary structures on roads, and that licences are needed for scaffolding, hoardings, building materials, crane operations and skips; an application without a current public liability insurance certificate and a full method statement will not be processed. The skip company applies for the skip permit, and no skip may stand on the footway or verge. For a skip in a parking bay, get the bay suspension approved first, applying at least ten working days ahead. On the Ealing side of Woodstock Road, ask Ealing Council.

Continue planning

The Chiswick area guide · Loft conversion across London · Hampstead Architecture & Planning · Hampstead Chartered Surveyors

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