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What Islington roofs go wrong with, and what it costs

Islington is one of London's densest inner boroughs, built up through the Georgian and Victorian eras with terraced housing. Many roofs are original or patched piecemeal, so slipped slates, aging flat roof extensions and poor guttering are common complaints. The mix of conservation areas and converted flats means roofing work often has to balance repair with keeping the street appearance consistent.

The houses

The classic Islington property is the Georgian terrace, found around Barnsbury, Canonbury and Islington Green, with flat or very low pitched roofs hidden behind a parapet wall. These parapet roofs rely on a sound membrane and good drainage, and when they fail the first sign is usually a damp patch on the top floor ceiling. Many of these houses have been split into flats, so a roof repair often needs sign off from a leaseholder or managing agent before work can start.

Further out towards Highbury, Finsbury Park and Archway, housing shifts to Victorian terraces and semis with traditional pitched slate roofs, along with blocks of converted flats. These pitched roofs are generally easier to inspect than the flat parapet type, but age is still the main issue, with original slates reaching the end of their life and old lead flashing around chimneys starting to crack.

The jobs we see most

• Flat roof repair Flat roofs on Georgian terraces and rear extensions are a common call, usually needing a new membrane once the old felt starts to fail.
• Slipped and missing slates On Victorian terraces around Highbury and Finsbury Park, wind and age cause slates to slip or go missing, letting water into the loft below.
• Chimney and flashing repairs Many Islington roofs still have working or capped chimneys, and the lead flashing around them is a frequent source of leaks.
• Guttering and parapet drainage Parapet walled roofs depend on hidden gutters staying clear, so blocked drainage is a regular job before it causes damp inside.
• Loft conversion roof work With many terraced houses converted or extended into the loft, roof strengthening and new rooflights are steady work.

Conservation areas and listed buildings

Large parts of Islington sit within conservation areas, reflecting the borough's many Georgian and Victorian streets, and this can affect what a homeowner is allowed to do to a roof. Visible repairs often need like-for-like materials such as matching slate or lead rather than modern substitutes, and some changes may need planning permission even where it would not normally apply. The council planning team can confirm exactly what applies to a specific property before any work begins.

What it typically costs in Islington

Typical London ranges. Your quotes will depend on access, scaffolding and the materials on your roof.

One local tip

If you own a flat in a converted terrace, check early who is responsible for the roof under the lease, since repairs often need the freeholder or managing agent involved before a roofer can start.