Construction drawings in Bexley

A borough of houses with a quiet heritage layer

Bexley is a house borough. 75.3 per cent of households live in a house and 68.6 per cent own their home, so the typical job is a family adding space rather than a developer adding units. That affects how we draw: more rear extensions and loft conversions, fewer shared-structure problems.

Heritage is present, if less dense. There are 23 conservation areas and 114 Historic England list entries, among them 6 at Grade I. The borough also holds 4 scheduled monuments and 4 registered parks and gardens. Near any of these, we ask the council early whether an extension affects a setting.

Green Belt covers 17 per cent of the area. Check your plot against the map before commissioning anything.

Extract fans, ventilation and the details nobody remembers

Extensions often fail at the ventilation stage, not the structural one. Approved Document F sets the extract rates: Intermittent extract: kitchen 30 l/s with cooker hood (60 l/s otherwise), utility 30 l/s, bathroom 15 l/s, WC 6 l/s. We show each fan, its duct route and its outlet on the plans, so the builder is not cutting a hole through a finished wall later.

Insulation is the other quiet item. New elements in existing dwellings, limiting U-values W/(m²·K): roof 0.15, wall 0.18, floor 0.18, windows 1.4 (or WER Band B), doors 1.4. Our specification names the product and thickness that meets each value, because a figure alone does not tell a joiner what to buy.

The standard of workmanship is covered by Approved Document 7: Materials and workmanship, 2013 edition incorporating 2018 amendments, which we reference in the specification so the standard is explicit.

Bexley's planning record in numbers

Bexley decided 877 householder applications in its latest published year, granting 94.6 per cent, with 99.4 per cent decided in time. That is a permissive, quick record for householders.

Prior approval for larger home extensions is much less common: 7 granted and 8 refused. The council also handled 323 lawful development certificate applications. Past results say nothing about your own, but they help us advise on timing.

Levels, drainage and the back garden

Gardens take up 25.1 per cent of all land in the borough, and in a house borough that is where most extensions go. The garden is also where the quiet problems live: a drain run that crosses the new footprint, a manhole under the proposed slab, a tree whose roots decide the foundation depth.

We therefore ask for a drain survey early and show the existing runs on the ground floor plan. If a pipe must be diverted or built over, the drawing says how and to what standard, so the builder is not renegotiating on the day the excavator arrives.

Floor levels get the same attention. A rear extension that steps down into the garden needs a threshold, a drained patio and a damp-proof course that line up. Our sections fix each of those heights against a datum taken from the survey.

What the set costs and where to go next

Construction drawings are quoted as a fixed fee once we have checked your constraints, which is free. The set can double as building regulations information; see building regulations drawings in Bexley, and structural calculations in Bexley for the engineer's side.

Wider options for the borough sit under architectural drawings in Bexley. The same service is open to owners next door in Bromley and in Croydon.