House extension in Twickenham

Connect the added space to the existing home.

Start with the house extension brief

Begin with how the new space will meet the old rooms, garden and circulation. A measured brief should record boundaries, levels, existing drains, neighbouring windows and the parts of the building you intend to keep.

Develop daylight, structure and services alongside the floor plan. Agree which openings and finishes are included, how the existing home will be protected during construction and which decisions need surveys or approval before a quotation.

The local building context

The St Margaret’s Estate was bought by the Conservative Land Society in 1854 and laid out around three private pleasure gardens; its conservation area was first designated on 2 November 1971 and later extended. Detached villas in a mix of Gothic and Italianate styles dominate its southern end, Netherton Road is a cul-de-sac of two-storey yellow-brick houses under shallow slate roofs, and Kilmorey Gardens is mainly terraced. In the Twickenham Park area beside St Margarets station, Riverdale Road has large four-storey Victorian houses, while East Twickenham’s Cambridge Park was built in the late 19th century.

The Strawberry Hill guidance describes a leafy residential area of large older homes and 20th-century infill houses and flats, with shops near the station. Strawberry Hill Road and Waldegrave Gardens form two treed avenues of substantial late Victorian houses in generous plots, some now flats; Waldegrave Park was developed after an 1883 auction; the Strawberry Vale conservation area is a tightly packed group of Victorian riverside houses whose long gardens slope down to the river, with boathouses; and Mallard Place, built from 1977 to 1984, has fifty-seven flats and forty-five terraced houses by the Eric Lyons Cunningham Partnership.

Twickenham and St Margarets appear in ward names, and all three places appear in the name of a Local Plan area and of several conservation areas. Even so, neither a name nor a TW1 or TW2 postcode shows which conservation area, list entry or Article 4 schedule applies. Hounslow once designated most of the St Margaret’s Estate as its Old Isleworth Conservation Area; boundary changes in 1994 brought the whole estate into Richmond upon Thames. There is no conservation area called East St Margarets, and East Twickenham’s Sandycoombe Road is not Kew’s Sandycombe Road. For the exact house number, look at the council’s conservation map, the list entry and the Article 4 schedules, then at the title or lease and the planning history.

Local design and consent context

Four town areas have appraisals from 2023. Twickenham Riverside’s, adopted on 20 November 2023, gives extensions in 1982 and 1991, and it proposed boundary changes, including adding 3–33 King Street, whose outcome it does not record. Twickenham Green and Queen’s Road appraisals were adopted the same day; the Green itself is Other Open Land of Townscape Importance, and most of Queen’s Road’s housing was built between 1880 and 1895. Trafalgar Road’s appraisal dates from 30 March 2023 and describes 12 pairs of two-storey semi-detached houses of about 1845.

The Twickenham Riverside direction, confirmed on 21 August 1997, covers numbered houses in Lebanon Park and 137–149 and 155–165 (odd) Richmond Road for six types of work: enlargements and other alterations, hard standings, satellite antennae, gates, fences and walls, exterior painting other than repainting what is already painted, and demolishing boundary enclosures. The Cole Park Road direction, made on 17 November 2020 and confirmed on 16 March 2021 without 2A, 2B, 2C, 20 and 29A, removes several householder classes where the work fronts a highway. The register also lists directions on Queen’s Road, Holly Road, Grosvenor Road and Trafalgar Road; read each before relying on it.

The direction dated 12 July 2000 covers work that would front a highway or open space, and chimney alterations in every case. It applies all eight of its categories to 1–29 Netherton Road and 1–18 and 20 St Margaret’s Drive, but only hard surfaces and satellite antennae to 270–284 (even) St Margaret’s Road; it also covers 1–39 St Stephen’s Gardens, specified numbers on Sandycoombe Road and 307 and 309 Richmond Road in Cambridge Park, and 1–13 Victoria Road in Amyand Park Road. The Mallard Place direction of 2009 covers 71–97 (odd) and 66–80 (even) Mallard Place and 69–77 (odd) Strawberry Vale where work fronts a highway or waterway, and chimney alterations there in any case. A separate 2022 direction concerns turning commercial premises in the town centre and the St Margarets and Strawberry Hill parades into homes.

Access and site planning

Work out early where a skip, a scaffold and deliveries can go, particularly on tightly packed groups such as Strawberry Vale. The skip firm must be registered and insured for public liability before Richmond will license a skip on a path or road, and each licence covers three weeks at most; in a controlled parking bay the bay must be suspended as well. A separate licence covers scaffolding, hoardings and materials; the council will not issue it until a site meeting with one of its Inspection and Enforcement Officers has taken place, and tacit consent does not apply. Ask for a parking suspension with at least 10 working days’ notice; once in place it can be enforced even outside controlled hours.

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The Twickenham area guide · House extension across London · Hampstead Architecture & Planning · Hampstead Chartered Surveyors

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