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Rear and side extensions for Islington's Victorian and Georgian terraces. Full planning support for conservation area applications across N1, EC1, N5, and N7.
Find a builder →Velux, dormer, and mansard loft conversions in Islington properties. Victorian terraces are ideally suited — planning advice included for conservation area streets.
Find a builder →Full house and period property refurbishments across Islington — sympathetic restoration alongside modern open-plan remodelling.
Find a builder →Office refurbishments, shopfits, and commercial building works across Islington, Clerkenwell, and Angel.
Find a builder →RSJ steel beam installation, load-bearing wall removal, underpinning, and party wall works — essential in Islington's densely-packed terraced streets.
Find a builder →Islington's Georgian townhouses are particularly well suited to basement and lower-ground-floor conversions. Full structural and waterproofing work.
Find a builder →| Job | Low estimate | High estimate |
|---|---|---|
| Single-storey rear extension | £25,000 | £50,000 |
| Double-storey extension | £45,000 | £90,000 |
| Loft conversion (Velux) | £20,000 | £35,000 |
| Loft conversion (dormer) | £35,000 | £65,000 |
| Full house refurbishment (3-bed) | £40,000 | £100,000 |
| Kitchen extension (open plan) | £30,000 | £60,000 |
| Garage conversion | £12,000 | £25,000 |
| Garden room / studio | £15,000 | £40,000 |
| Basement conversion | £40,000 | £80,000 |
| Party wall agreement | £700 | £2,000 |
| Load-bearing wall removal (RSJ) | £1,500 | £4,000 |
| New build (per m²) | £2,000 | £4,000 |
Prices are estimates for Islington 2026. Conservation area projects and period properties may cost more. Always get multiple quotes.
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Review each builder's experience with Islington's period properties and conservation areas. No obligation.
Islington is one of London's most densely built and planning-sensitive boroughs. A high proportion of its streets fall within conservation areas — covering much of Barnsbury, Canonbury, Highbury Fields, and Clerkenwell — meaning that almost any building work beyond routine maintenance requires a planning application rather than Permitted Development. Georgian townhouses are particularly prevalent in the N1 and EC1 postcodes, and their listed status or location in Article 4 Direction areas can require specialist builders experienced in working with original lime mortar, timber-framed floors, and period features that must be preserved.
Basement conversions are among the most sought-after projects in Islington, where above-ground extension options are often limited by planning. Converting a lower-ground or cellar space into a habitable bedroom, gym, or open-plan kitchen-diner can add significant value in one of London's highest-demand property markets. Party wall agreements are almost universally required for any extension or basement work in Islington's terraced streets — engage a party wall surveyor at the same time as your architect to avoid delays.
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Covering N1 · EC1 · N5 · N7 · N4 · N19