Loft Conversion Drawings in City of London

Which postcode districts around City of London do we cover for loft conversion work?

Every City of London postcode district we draw in, the stock that dominates it and the authority that validates a loft conversion there. City of London fees below are the statutory England rates for 2026, not loft conversion estimates.

What changes about a loft conversion in each part of City of London?

Roof pitch, wall build-up and plot depth change every few City of London streets, and each one changes what a loft conversion can achieve at that address.

• Barbican (EC2Y) — Brutalist listed estate defines Barbican, where listed brutalist apartments (barbican estate) set what a loft conversion can do. Post-war roofs on these estates are often trussed across EC2Y. Any Barbican loft conversion is validated by City of London Corporation, with Barbican Centre the usual Barbican reference point on the site plan.
• Smithfield (EC1A) — loft conversion work in Smithfield means mostly commercial, residential lofts. Smithfield is Georgian and Victorian commercial. The Victorian butterfly and double-pitched roofs on these streets normally clear the 2.2 m head height a dormer conversion needs once the ceiling joists are raised throughout EC1A. City of London Corporation decides the Smithfield application, and Smithfield Market anchors the Smithfield location plan.
• Fleet Street (EC4) — a loft conversion in Fleet Street starts from mostly commercial, residential conversions, and Fleet Street reads as Georgian and Victorian commercial. The Victorian butterfly and double-pitched roofs on these streets normally clear the 2.2 m head height a dormer conversion needs once the ceiling joists are raised in EC4. City of London Corporation assesses Fleet Street loft conversions against its own Fleet Street character guidance, and the location plan we draw for Fleet Street references Royal Courts of Justice.
• St Paul's (EC4M) — a loft conversion in St Paul's starts from mostly commercial, listed residential, and St Paul's reads as Listed heritage commercial core. The Victorian butterfly and double-pitched roofs on these streets normally clear the 2.2 m head height a dormer conversion needs once the ceiling joists are raised in EC4M. City of London Corporation assesses St Paul's loft conversions against its own St Paul's character guidance, and the location plan we draw for St Paul's references St Paul's Cathedral.

How do conservation areas and Article 4 affect a loft conversion in City of London?

Conservation areas covering City of London: City of London Corporation runs 27, and Fleet Street, Whitefriars, St Paul's are the ones City of London owners meet most. A loft conversion inside a City of London conservation area loses permitted development, so the City of London submission is a householder application at £548 decided in 8 weeks — not a £249 prior approval decided in 6 weeks. In Fleet Street a loft conversion is judged on the street elevation first.

City of London and Article 4: Multiple Article 4 Directions around office-to-residential, demolition, and shopfront changes. A loft conversion planned at a EC1A address is checked against that direction first; City of London Corporation publishes the City of London extent, and the EC1A line rarely follows the City of London boundary you would expect.

The building fabric around City of London: Very limited residential — Barbican Estate (listed post-war), Golden Lane Estate, modern luxury flats; overwhelmingly commercial. Overwhelmingly commercial; residential planning extremely constrained; one of the two highest listed-building densities in London. A loft conversion in City of London is scoped against that stock first, because it decides whether the scheme runs as permitted development, a £274 Lawful Development Certificate, or a full £548 application to City of London Corporation.

Which neighbouring authorities border City of London?

• Camden — adjoining City of London, with 40 conservation areas centred on NW1. A loft conversion on the far side of the City of London line is determined by Camden Council, so the City of London quote for loft conversions is checked against Camden guidance before it is issued.
• Islington — the Islington boundary runs against City of London, so a loft conversion a street from City of London is decided by Islington Council instead. Islington runs 40 conservation areas across N1 and its neighbours, which is why loft conversions priced for City of London are re-checked against Islington policy whenever the City of London address sits on that edge.
• Hackney — the Hackney boundary runs against City of London, so a loft conversion a street from City of London is decided by Hackney Council instead. Hackney runs 29 conservation areas across E2 and its neighbours, which is why loft conversions priced for City of London are re-checked against Hackney policy whenever the City of London address sits on that edge.
• Tower Hamlets — the Tower Hamlets boundary runs against City of London, so a loft conversion a street from City of London is decided by Tower Hamlets Council instead. Tower Hamlets runs 58 conservation areas across E1 and its neighbours, which is why loft conversions priced for City of London are re-checked against Tower Hamlets policy whenever the City of London address sits on that edge.

Sources for this City of London loft conversion page: borough policies maps and conservation-area registers (2025–26), Royal Mail postcode district boundaries, the Town and Country Planning (Fees for Applications) (England) Regulations, the Town and Country Planning (General Permitted Development) (England) Order 2015 as amended, and the Party Wall etc. Act 1996.