Construction drawings in Islington

The Urban Design Guide and the Basement SPD

Islington's plan is the Islington Local Plan: Strategic and Development Management Policies, Site Allocations, and Bunhill and Clerkenwell Area Action Plan, adopted in 2,023. For home projects the council points to the Islington Urban Design Guide SPD, which governs how additions relate to the street and their neighbours, and to its Basement Development SPD, which sets a demanding standard for anything below ground.

The basement document is a reminder that the borough has strong views on structure and water. Full basement excavation is a specialist piece of work that this site does not offer, but lower-ground-floor alterations in a standard house, such as lowering a slab or forming a new opening in a retaining wall, still need careful drawn detail. We show the underpinning or the new foundation, the damp-proofing and the drain levels clearly enough that a party-wall surveyor can assess them.

For rear extensions, the Urban Design Guide drives the massing. Our drawings carry the height at the boundary and the stepped-back upper floor as dimensioned items, not as notes.

Rear additions in Islington often sit against high brick boundary walls, shared with neighbours who have lived there for decades. We draw the new foundation and the party-wall junction at full size, and mark which parts of the work will need a party wall notice, so that the notice is served before the builder arrives.

Flats, owners and the paperwork around them

Only 16.3 per cent of Islington households live in a house or bungalow, and 26.7 per cent own their home. Most work is therefore in flats, maisonettes and houses divided into flats, and every project involves someone else's ceiling, floor or wall.

The set shows compartment lines, fire doors, sound-resisting floors and any escape window, to the figures in Approved Document B in the table. It names a structural solution for each opening, and our structural calculations provide the bearing details. The lease is the owner's business, but we note on the cover sheet which consents we have been told are in place.

The borough levy is the London Borough of Islington Community Infrastructure Levy (CIL) Charging Schedule, at £300/m² (Zone A); £250/m² (Zone B) — residential dwellings, Use Classes C3 and C4, and Mayoral CIL adds £80 per square metre. Floor areas on our drawings follow the levy's measurement convention.

Sound is the complaint we most often help avoid. A new floor above a neighbour should have a stated build-up, a resilient layer and sealed edges, and the drawings show each of those as a section, not a sentence. If a dispute does arise, a drawn detail is worth far more than a promise.

Decisions and timing in Islington

Islington decided 337 householder applications in its latest year and granted 92.6 per cent. It decided 98.8 per cent within eight weeks or an agreed extension. The council is quick and mostly supportive, though the numbers are borough-wide and say nothing about a listed property.

Because decisions arrive on time, the technical set can be finished to a firm timetable. We aim to issue shortly after consent, so a builder can start on a known date. For projects with listed building consent, we also prepare a short condition-discharge pack from the same drawings.

Building Regulations, as ever, are separate. The U-values, ventilation rates and stair limits in the table apply whether or not the house is listed, though building control can take a relaxed view of some energy requirements in historic buildings, where meeting them would damage the fabric.

Where a lawful development certificate or an earlier consent already exists, we start from it rather than redrawing, and compare the technical set to it line by line before issue. That check catches the small differences, a window moved by a few centimetres or a flue added, that otherwise turn up in an enforcement inquiry later.

Next steps in Islington

The borough overview is at architectural drawings in Islington, and the approval stage is explained in building regulations drawings in Islington. For energy, ask about SAP calculations in Islington.

The same service is available in Hackney, Camden and Haringey, and described generally at construction drawings in London.