Building Control Applications in London

Building control approval can be obtained through a full plans application or a building notice. A full plans route, supported by a complete drawing package, is checked before work starts and gives more certainty and a better basis for contractor pricing. A building notice allows work to proceed with inspection but less up-front scrutiny, which suits simpler projects. We advise which route suits your project and prepare the submission accordingly.

Residential building control can be carried out by local authority building control or by a registered building control approver (formerly an approved inspector). We coordinate the submission and the inspection regime with whichever body is appointed, and ensure the drawings and consultant information support a smooth approval. For higher-risk buildings, additional regimes apply and specialist support would be arranged.

Building control is not a one-off check; it is a series of inspections through the build. The inspector is typically notified to attend at key stages — excavation and foundations, the damp-proof course, drainage before it is covered, structural elements, insulation and, finally, completion — and the work must not be covered up before the relevant inspection. Missing a stage can mean opening up finished work to prove compliance. We make sure the drawings anticipate these stages and that the contractor understands the notification points, so inspections confirm progress rather than interrupt it.

The end point of the process is a completion certificate, the building control body’s confirmation that the work complies with the regulations. It is easy to overlook in the rush to finish, but it is the document a buyer’s solicitor or a lender will ask for, and unfinished or uncertified work routinely complicates a sale or remortgage years later. We help keep the application live to completion so the certificate is actually issued, rather than the project being abandoned at practical completion with the paperwork left open.

For most houses and individual flats, the routes above apply. For higher-risk buildings — broadly those over eighteen metres or seven storeys — a separate, more rigorous regime under the Building Safety Regulator applies, with formal gateways and dutyholder responsibilities. This rarely affects a typical prime-residential project, but where a scheme approaches that threshold we are clear about it and arrange the specialist support the regime requires, rather than treating it as ordinary building control.

Full plans front-loads certainty: drawings are checked before you build, reducing mid-build redesign. Building notice is quicker to start but leaves compliance to inspection as work proceeds. For structural openings, lofts and complex refurbishments we usually recommend full plans. We prepare the drawing package so a full plans submission is complete rather than iterative.

Building control fees are separate from our design fees and are paid to the building control body.

Applications rely on coordinated technical drawings and supporting information: structure, fire, insulation, ventilation, drainage and any specialist notes. Incomplete packs generate conditions and delays. We align engineer calculations and energy information with the architectural set so the story is consistent.

Planning permission does not equal building control approval. Both may be required; neither replaces the other.

Even with full plans approval, site inspections and possible amendments occur. Construction-stage architectural support helps when unexpected conditions appear. We keep clients clear on what building control signs off versus what the contractor must still deliver under the building contract.

Regularisation of unauthorised completed work is a different, harder path — better to apply before you build.

Not every project needs a building control application, and knowing where the line falls avoids both missed paperwork and unnecessary submissions. Structural alterations, extensions, loft conversions, basement works, new or altered drainage and most changes to a building's thermal elements are notifiable and need a formal route. By contrast, some common jobs are handled through competent person schemes: a registered installer replacing windows, a boiler or a consumer unit can self-certify the work and notify building control on your behalf, so no separate application is made. The trap is assuming a whole project falls under a scheme because one trade does — a refurbishment that includes a new structural opening needs an application even if the electrician and the glazing installer self-certify their own parts.

We map which elements are notifiable at design stage, so the application covers what it must and the scheme certificates slot in alongside the completion certificate at the end. That matters later: a buyer's solicitor will look for evidence on every element of the work, and a missing self-certification certificate is as awkward in conveyancing as a missing approval.

When a full plans application is deposited, an examiner works through the pack against the Approved Documents: structure under Part A, fire safety under Part B, ventilation under Part F, stairs and protection from falling under Part K, energy performance under Part L and electrical safety under Part P, among others, with Part O overheating applying only where a new dwelling is created. The check is not a design review; the examiner is not judging whether the scheme is attractive or well planned, only whether the drawings and calculations demonstrate compliance. Where information is missing or a detail does not stack up, the usual response is a query list or an approval issued subject to conditions rather than an outright rejection, and the dialogue continues until each point is closed out.

That dialogue is shortest when the building regulations drawings and the engineer's calculations answer the predictable questions before they are asked: how the new beam is restrained, how escape and alarm provision works once the wall comes down, how the extension meets its energy targets. We treat the examiner's likely checklist as the brief for the pack, so conditions are the exception rather than the routine.

Building control in a flat is a different exercise from the same works in a house, because the regulations protect the building as a whole rather than one demise. Fire separation between dwellings and to the common parts must be maintained wherever work touches it, and it is easy to breach without meaning to: recessed lights cut into a compartment ceiling, services run through a party structure, a new opening in a wall that turns out to be doing more than dividing rooms. Sound separation between dwellings is assessed too, so altering a floor build-up in a converted building can trigger requirements a house owner never encounters. Inspectors look hard at these points precisely because they protect neighbours who had no say in the project.

A second consent usually runs alongside: many leases require the freeholder's licence for alterations, and its technical conditions often mirror building control's concerns. We coordinate the licence to alter pack with the building control submission so the two tell one consistent story, and where a flat refurbishment touches compartment lines we deal with it in the drawings rather than leaving the inspector to discover it on site.