A kitchen extension in Camden Town begins with two questions that have nothing to do with the plan. The first is tenure: whether you own a whole house, a converted flat or maisonette within a subdivided house, or an upper part above commercial premises — because that determines whether the rear space you want to build into is yours to build in, whether a freeholder's consent and a Licence to Alter sit in front of the planning application, and whether a shared drainage stack is about to become everybody's business. The second is what the back of the building actually faces. Camden Town's plots are compact and pressed against intense commercial activity, so a rear elevation here may look onto a service yard, a delivery or refuse route, a commercial back with its own extract and plant, or the canal and railway edge rather than a neighbouring garden. Both answers change the kitchen brief before a single wall is moved.
That is why the extract comes first. A kitchen extension turns a modest fit-out question — where the cooker hood goes — into an external alteration and a neighbour issue. A ducted extract has to terminate somewhere on the building, and on a Camden Town rear elevation that terminal may land within a few metres of a mixed-use neighbour's window, beneath the flats in the upper parts above, or across a narrow yard from a commercial opening. The duct itself needs a route: a run through the new roof or rear wall with enough straight length and few enough bends to move air at the rate the building regulations expect, and a ceiling void deep enough to carry it alongside the new structure. Camden Town's own first checks put noise, ventilation, fire escape and access ahead of layout for exactly this reason. Decide the terminal and the duct route, then draw the kitchen around them, rather than the other way round.
The traffic is not one-way. In a canal, railway, music and evening-economy setting, a new kitchen at the back of the building is also a receiver. Extract and plant belonging to a commercial neighbour may already discharge close to where you want your new glazed doors and rooflights, and late servicing, deliveries and the general acoustic background of a mixed-use block do not stop because the extension is finished. So the glazing specification, the position of openable windows and the background ventilation strategy have to be designed with that in mind rather than assumed to be the same as they would be on a quiet residential street. Where a rear extension is largely glazed we look at solar gain and summer overheating in the same breath, because an acoustically glazed kitchen that cannot sensibly be ventilated by opening a window needs its fresh air designed in mechanically instead. This is the part that gets missed most often.
Drainage is the second thing that quietly decides the plan. Moving a kitchen to the rear of the property means moving its waste, and a kitchen waste run needs continuous fall to a connection that can take it. In a whole house with its own outside space behind, that is usually a matter of setting the invert levels and the gully or stack position before the floor build-up is fixed. In a converted house it is a different problem entirely: the existing stack is often shared with the flats above and below, the connection you want may not exist within your demise, and altering a shared stack needs the freeholder's consent as well as the neighbours' tolerance. Where levels genuinely do not allow a gravity run, a pumped waste is possible, but it should be a considered decision taken early rather than a late rescue. We establish what the drainage will physically accept before committing to where the sink and the island go.
Then the structure. Opening up a rear wall for a kitchen extension usually means a beam carrying the floors above and, in a converted house or an upper part, a load path that runs down through somebody else's flat — a coordination and consent question as much as an engineering one. Foundations close to the boundary bring the Party Wall etc. Act 1996 into play, and the notices run separately from the planning decision. Where the boundary is not a domestic one — a commercial party wall, a servicing yard, a passage carrying a right of way — the fire requirements of the building regulations become sharper, because the distance to the boundary governs how much unprotected glazing the new elevation can carry and how the wall must be constructed. A full-width glazed rear wall is not automatically available on a tight urban plot, and that is far better established at sketch stage than at building control.
The consent route follows from all of that. Camden Town Conservation Area has its own appraisal and management strategy used by Camden when assessing planning applications, so roof, facade and setting issues need checking early, and the designation should be confirmed for your exact address rather than assumed from the neighbouring street. Permitted development rights for householder extensions apply to houses and not to flats, and are in any case frequently restricted on conservation land, so most Camden Town kitchen extensions are designed for a full householder application. Camden aims to determine householder applications within about eight weeks, though conservation input can lengthen that. We survey, test the extract, plant and drainage against the constraints, prepare the planning drawings and the heritage material where a heritage asset is affected, then produce the building regulations package. No architect can guarantee a Camden decision; what we can do is remove the reasons for a refusal.
