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Get started17 Keystone Crescent is a three-bedroom end-of-terrace house in Islington, London, London (N1 9DS). It has a recorded floor area of 118 m² (around 1266 sq ft), construction records dating it to before 1900 and council tax band G. The latest certificate (October 2009) shows an F (score 27), near the bottom of the EPC scale. The latest certificate is from October 2009, so improvements made since then won't be reflected.
Sale prices here have outpaced London HPI: 9.5% per year against 0% for the wider region. On a £-per-square-foot basis, the last sale (£1,015/sq ft) was about 44.6% above the typical sold price in the postcode. At 118 m² the property is well over the postcode median (89 m² across 21 EPCs), placing it in the larger end of the local stock. On energy efficiency it sits in the bottom 10% of properties in this postcode — significant headroom for improvement. 3 bedrooms is on the larger side for this postcode, where 1 is the typical count. 3 planning records sit against the property, 1 approved, 2 refused. Past consents include an extension, meaningful when judging how the property has evolved. The record references listed-building consent, which constrain future alterations. Last sale on file: £1,285,000 in January 2021. Across the public record there are 4 sales, relatively high churn for a single property. That sale was during the post-pandemic price surge, when transactions cleared materially above pre-2020 trend.
17 Keystone Crescent sits at the bottom of the postcode for energy efficiency — meaningful headroom to improve.
This certificate is over 10 years old and is no longer valid.Expired 08 Oct 2019
17 Keystone Crescent has multiple listed-building consents on file — alterations need formal heritage approval.
Extension: Rear of property
Listed building consent in connection with internal and external works of refurbishment and repair, including lowering rear ground level window to form a door, insertion of bi fold doors into rear extension, insertion of window into bomb shelter in connection with use as part of lower ground floor accommodation, installation of waste pipe to rear elevation and cladding of rear extension in timber.
Latest sale on 17 Keystone Crescent was the highest on Land Registry record across the postcode.
£1,287,000
Modelled from EPC, postcode comparables and a sale-price growth of 9.5% per year over 25 years.
£1,285,000
Growth on file: 9.5% per year over 25 years.
17 Keystone Crescent is notably below the street on co₂ emissions.
Price per m²
£10,929
Street avg £8,432
Floor Area
118 m²
Street avg 96 m²
Habitable Rooms
5 rooms
Rail-style transport is unusually close for this postcode.
Crime
10/mo
Rising year-on-year across the wider district.
Nearest stop
0.1 km
King's Cross /Pentonville Road — bus stop.

Daytime· 07:00 – 23:00
60.4dB

Extension: Rear of property
The existing building is a Grade II Listed terrace house, (4 storey including basement), with an existing bomb shelter and brick extension in the rear garden. (Refer to attached photographs). The proposal shows a restoration of the house as a single family house. This proposal is for a modest improvement to the existing bomb shelter and extension, which is being modified to increase the family living space. It is intended to regenerate the use of the bomb shelter and incorporate it into the use of the house. In order to differentiate the extension from the house, the fascia will be clad with cedar timber boards, whereas the existing house is brick. The timber cladding will highlight the original features of the main house as it will be a contemporary extension, rather than competing with the original features. At present the extension looks very tired and is in need of an update. It is proposed that the extension will have level access glass bi fold doors into the garden and the bomb shelter will have a circular glazed window to allow natural light within the space. The circular window is proposed rather than a square window so that it stands out as a feature to differentiate the bomb shelter from the rest of the house. It is also proposed to create double doors to open into the garden within the existing sash window sympathetically by mimicking the style and design of the existing windows. The proposed en-suite in the second floor bedroom will acquire a modest waste flow pipe to the rear elevation where there are also pipes existing.
1 more application for this property
Join to see all planning history.
25 January 2021Most recent
£1,285,000
-2.3%over 4 years29 July 2016
£1,315,000
+75.3%over 6 years4 May 2010
£750,000
+455.6%over 14 years16 February 1996
£135,000
Median price across the last 5 sales in N1 9DS: £850,000 (2025–2021).
Street avg 5 rooms
CO₂ Emissions
13.0 t/year
Street avg 4.7 t/year
N1 9LT
Closest school
0.2 km
Winton Primary School. 74 schools nearby.
Night-time· 23:00 – 07:00
51.8dB
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