Building Control Loft stair — pitch, headroom and dimensions +
Building Control Guarding / balustrade heights +
Building Control Fire safety in a loft conversion +
Building Control Escape / egress windows +
Building Control Smoke and heat alarms +
Building Control Extension U-values (Part L, current) +
Building Control Extension glazing area limit +
Building Control Ventilation to rooms and wet areas +
Building Control Cold-roof / loft ventilation +
Building Control DPC and rising damp +
Building Control Foundation depth +
Building Control Steel beam bearing and padstones +
Building Control Notching and drilling joists +
Building Control Chimney breast removal +
Building Control Lintels over openings +
Building Control Sound insulation between flats (Part E) +
Building Control Part P — notifiable electrical work +
Building Control Downstairs WC and accessibility (Part M) +
Building Control Party Wall etc. Act — when notice is needed +
Building Control Permitted development — rear extension limits +
Building Control Building over or near a public sewer +
Building Control Drainage falls and gradients +
Building Control Radon protection +
Building Control Structural opening / knock-through +
Common Site Issues Old drains discovered under the extension footprint +
Common Site Issues Trench collapsing in unstable or wet ground +
Common Site Issues Rising damp appears after completion +
Common Site Issues New floor or beam bounces / deflects +
Common Site Issues Cracking at the junction of new and old work +
Common Site Issues Cold bridging at the extension junction +
Common Site Issues Condensation and black mould in the loft +
Common Site Issues Underpinning causing movement +
Common Site Issues Party-wall dispute with a neighbour +
Common Site Issues Existing floors are out of level +
Common Site Issues Water ingress at a flat-roof upstand +
Common Site Issues Boiler flue too close to a window or boundary +
Common Site Issues Soil / vent pipe routing in a new extension +
Common Site Issues Not enough headroom for the loft stair +
Common Site Issues Loft escape route fails fire regs +
Common Site Issues Overheating in a large glazed extension +
Common Site Issues Foundation must sit on the boundary +
Common Site Issues Existing wall is out of plumb +
Common Site Issues Penetrating damp through a solid brick wall +
Common Site Issues Loose plaster on old lath-and-plaster +
Common Site Issues Shower or wet-room floor won't drain +
Common Site Issues Underfloor heating has cold spots +
Common Site Issues Extension overloads the existing electrics +
Common Site Issues Condensation from poor ventilation +
Common Site Issues Cavity wall-tie corrosion or failure +
Common Site Issues Rot or woodworm in existing floor joists +
Common Site Issues Leaking roof valley or junction +
Common Site Issues Work built beyond the planning approval +
Common Site Issues Building control fails an inspection +
Common Site Issues Asbestos found in an older property +
Common Site Issues Structural crack in an existing wall +
Common Site Issues Rain stopping groundworks +
Common Site Issues Materials arrive damaged or short +
Common Site Issues Kitchen units won't fit out-of-square walls +
Common Site Issues Steel or bi-fold doors won't operate +
Common Site Issues Basement waterproofing failing +
Common Site Issues Air leakage / thermal bypass +
Common Site Issues Noise transfer between flats +
Common Site Issues Property in a radon area +
Common Site Issues Trees / clay heave near foundations +
Common Site Issues New deep foundation next to a shallow existing one +
Common Site Issues Costs creeping from variations +
Common Site Issues Programme starting to slip +
Common Site Issues Client indecision on finishes delaying the job +
Common Site Issues Snagging disputes at completion +
Common Site Issues Insufficient drainage fall +
Common Site Issues Interstitial condensation in a wall build-up +
Common Site Issues Existing lintel missing or undersized +
Common Site Issues Wall insulation slumped, leaving cold patches +
Common Site Issues Neighbour access needed to build +
Guidance only — always confirm against current Approved Documents and your building-control body / structural engineer for your specific project.
