Kitchen Extensions Dartford

For a Dartford terrace or semi, a kitchen extension means a single storey addition at the back, sometimes wrapping round the side, and the depth along the party boundary is the first thing to settle. 37% of homes in Dartford are terraced houses and 32% are semi-detached or detached, and the Dartford Plan to 2037 treats terraces and semis differently once an extension goes up a storey. We build the shell, set the steel into the old back wall and fit the new kitchen in one continuous programme.

For Dartford, on London-derived ranges a rear kitchen extension of about 30 square metres typically costs £45,000 to £97,500 excluding VAT, or £60,000 to £100,000 for a side return; Kent work generally runs below that. GS Renovation Ltd, a building contractor based in Potters Bar, does the work in Dartford: the structural engineer we appoint designs the foundations and steel, we build the room and fit the kitchen, and a registered electrician certifies the electrics.

How deep a Dartford kitchen extension can run on the boundary

Plan the depth first, because it decides the room. Where the extension needs planning permission, Dartford Plan householder guidance says single storey rear extensions to semi-detached and terraced houses should generally be no deeper than 3.5m on a common boundary unless no adverse impact is shown. On a narrow Dartford terrace that figure shapes where the new back wall lands, where the roof lights sit and how much of the old kitchen becomes circulation space rather than worktop.

That guidance applies to an application. A smaller extension inside householder permitted development may need none, unless the house is in a conservation area or named on the council's List of Article 4 Directions, as fourteen individual West Hill properties are. Where an Article 4 direction is the only reason an application is needed, Dartford charges no fee for it. Building on the boundary also brings in the Party Wall Act, and the building owner serves the notices. We build to whichever scheme is approved.

Housing in Dartford

On the valuation list Dartford counts about 26,860 homes, 27% flats and 73% houses; 15% predate 1919, 24% are interwar and 60% post-war. Terraced houses make up 37% of homes here, and a terrace kitchen extension in Dartford starts in a narrow side return.

Why two storeys behind a Dartford terrace is a harder case

A kitchen extension with a bedroom above is a different proposition on a terrace than on a semi in Dartford. The Dartford Plan to 2037 says two storey extensions behind terraced houses cause particular problems, and they will not normally be allowed unless it is shown there is no undue impact on the adjoining houses. For a terrace owner that points to a single storey kitchen at the back, which also keeps the programme shorter.

Semis have a clearer route. On a semi, the plan wants the first floor set in 2 metres from the shared boundary. That creates a stepped rear elevation: the ground floor kitchen can run to the boundary while the upper storey sits back from it. The step means a separate flat roof section, its own flashings and a gutter line. The drawings detail them, and we sequence that roof work before the steels arrive so the house is weathertight again quickly.

Side additions and the front wall set back in Dartford

Where a semi or an end of terrace has side space, a Dartford kitchen can wrap round the side as well as the back. If the side part goes up two storeys and comes within 1m of the neighbour's boundary, the Dartford Plan guidance says its front wall should generally be set back at least 0.45m. That fixes where the side addition starts at the front, and so how much side space is left for the kitchen behind it. A single storey wraparound is not caught by that line.

Householder schemes here are also assessed for design under Policy M1, Good Design for Dartford, so brick, roof pitch and window proportions on a side addition are part of the drawings the owner submits. We price from those drawings and order facing brick to match early, since the match on a visible side elevation is what neighbours and passers by notice first, long before anyone sees the kitchen inside. Samples are agreed with you first.

Drainage and water under a new Dartford kitchen floor

Drainage is settled before the slab, because a kitchen extension often sits over the run from the back of the house. Dartford's Strategic Flood Risk Assessment lists surface water, groundwater and sewer flooding among the potential sources of flood risk in the borough, not only the rivers. For a new kitchen that means checking where the existing drain and any inspection chamber sit, and how the new roof sheds its rain.

Where the extension lands on an existing run, we expose it, survey it and agree with building control whether it is diverted or bridged. If the pipe is a public sewer, building over or near it also needs the water company's agreement. Rainwater from a large flat roof and several roof lights has to go somewhere sensible, not onto the neighbour or back against the house. Floor levels, the damp proof course and the garden threshold are set at this stage, before units are ordered.

• Floor levels matched through the old opening
• Hob gas supply altered by a Gas Safe registered engineer
• Airbrick ducts to keep existing timber floors ventilated

VOA Council Tax stock of properties, March 2025, for all 7 statistical areas in Dartford. Counts rounded by the VOA.

Related reading for Dartford homeowners planning kitchen extensions: kitchen renovation in Dartford, kitchen extensions in Grays, fitting the kitchen itself, how building control inspects an extension, our London kitchen extensions page and Utility Rooms and Their Cost.

Trusted Kitchen Extensions in Dartford

We run the whole job from one programme. Groundworks, drainage, the steel set into the old back wall under the structural engineer we appoint, the roof and the glazing come first, then the kitchen itself, so there is no gap between the builder leaving and a fitter arriving. You get a written programme showing when the back of the house is opened, when it is weathertight again and when the sink is back in use. Our founder, Abdelaaziz Saaid, brings three decades of hands-on building to the order of those stages.

• Photographs kept at each stage for your records
• New floor level matched to the existing house, with no step at the opening
• Rooflights set out against the engineer's steel layout

Checked by Abdelaaziz Saaid, founder and director of GS Renovation Ltd (Companies House no. 14611254). Structural design is by the consulting engineer appointed to your project.