Builders in Bexley: 1930s Semi & Extension Specialists in DA5, DA6, DA14 & DA16

Often not, if the address sits outside a conservation area. Bexley has no borough-wide Article 4 Direction restricting residential extensions or basements, unlike several neighbouring boroughs, so a standard single-storey rear extension within national permitted development size limits can usually go ahead without a full application. Inside one of the borough's 23 conservation areas, permission is normally required. We check your specific address before any design work starts.

Bexley has 23 conservation areas, including Old Bexley, Crayford and Welling. Unlike many other London boroughs, Bexley has no borough-wide Article 4 Direction covering ordinary residential extensions, only narrower directions covering commercial-to-residential conversion in specific town centres and industrial areas.

Parts of it, yes. The council's own strategic flood risk assessment maps detailed tidal flood zones for Crayford specifically, and groundwater flooding is a genuine concern across the borough given its dense London Clay, which does not drain quickly. Any lower-ground or drainage work near Erith and Crayford needs proper assessment rather than a standard specification.

A single-storey rear extension typically costs £2,500 to £5,000 per square metre at outer-London rates, among the more affordable of the boroughs we cover. A loft conversion typically costs £33,000 to £56,000 to build, and well-planned loft conversions in Bexley typically add 14 to 22 percent to property value.

Bexley Council decided 98.7 percent of householder applications within the statutory 8-week target, and approved applications took just 8.4 weeks on average, below the London average. Over the three years to March 2026, Bexley approved 91.7 percent of the householder applications it decided, the third-highest approval rate of any London borough.

Often, yes, even on the borough's dominant semi-detached streets. Even a semi-detached house shares a party wall with the neighbouring property, so most side extensions and loft conversions in Bexleyheath, Welling and Sidcup still need a Party Wall Agreement. Notices need serving at least two months before work starts, and we handle this as part of the project.

Red House was designed in 1859 by the architect Philip Webb for William Morris, and is widely regarded as the birthplace of the Arts and Crafts movement. It's now cared for by the National Trust and open to visitors, a genuinely significant piece of design history sitting inside an otherwise ordinary Bexleyheath street.

We cover the full London Borough of Bexley, including Bexleyheath, Sidcup, Welling, Erith, Belvedere, Crayford and Old Bexley, across postcodes DA5, DA6, DA7, DA8, DA14, DA15, DA16 and DA17.

Bexley's council has chosen a narrower approach than boroughs like Greenwich or Bromley, applying Article 4 Directions only to specific situations, commercial-to-residential conversion in 13 designated town centres and industrial locations, rather than a blanket rule covering ordinary householder extensions or basements. This means more Bexley addresses keep standard permitted development rights than in many neighbouring boroughs.

The Crayford Silts are a nationally significant geological deposit named after Crayford itself, with a rare surviving exposure at North End Pit. The borough sits mainly on London Clay, up to 150 metres deep in places, and this ground can restrict how far sustainable drainage systems relying on infiltration can be used, which we factor into drainage design.

Generally yes. Well-planned loft conversions in the borough typically increase property value by 14 to 22 percent, against a typical build cost of £33,000 to £56,000, making it one of the stronger returns available on the borough's dominant 1930s semi-detached housing stock.

Bexley approved 91.7 percent of householder applications over the three years to March 2026, the third-highest rate of any London borough, against a London average of 83.0 percent. The absence of a borough-wide Article 4 Direction and the borough's predominantly straightforward 1930s suburban housing stock likely both play a part, though the council does not publish an official explanation.

Thamesmead is split between Bexley and Greenwich, built on reclaimed marshland shared by both boroughs. Which council handles a planning application depends on the exact address, so we check the borough boundary carefully for any Thamesmead job before submitting anything.