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St Mary's Island

About

St Mary's Island is a modern residential community situated on a man-made peninsula in the River Medway. The area is characterised by its network of canals and contemporary housing, primarily apartments and townhouses. Landscaped public spaces and walking paths follow the water's edge, connecting the neighbourhoods. The overall layout is orderly, with a focus on pedestrian access and views across the water towards Chatham.

The island contains its own primary school, medical centre, and a small convenience store, serving local daily needs. A prominent feature is the consistent presence of the 19th-century lighthouse, which stands at the island's northern point. Regular river traffic, including freight vessels and occasional sailing boats, passes through the surrounding strait. The area is connected to the mainland by a single road bridge, giving it a distinct sense of separation.

Area overview

On average St Mary's Island has low deprivation and very high crime levels. Approximately 5.9% of homes in this area are social housing provided by a local council or housing association. The average income per household in St Mary's Island is £63,938 per year. There are 2 schools in St Mary's Island: 1 primary (0 Outstanding and 1 Good) and 1 secondary (0 Outstanding and 1 Good).

Crime rate

10/10

Crimes per 1k residents

N/A

Deprivation level

3/10

Income level

6/10

Connectivity

N/A

Property prices in St Mary's Island

Median price£322,750

Price per sq ft£387

Sales (last 12 months)68

Typical range (middle 50%)£205K – £443K

Based on 68 recent sales, the median property price is £322,750 (about £387 per square foot) in St Mary's Island area, with individual transactions ranging from £90,556 up to £800,000.

Prices by property typelast 12 months

Median sale price, median price per square foot, sales count, and percentile information for each property type in St Mary's Island over the last year.
Type	Sales	Median	£/sq ft	P5	P25	P75	P95
Detached	11	£490,000	£417	£392,500	£460,000	£512,500	£647,500
Semi-Detached	8	£430,000	£406	£326,875	£371,750	£478,750	£691,500
Terraced	18	£342,500	£416	£281,500	£305,500	£405,375	£576,300
Flats	31	£205,000	£322	£121,500	£162,875	£260,000	£355,000

10-year price trendmedian sale price in St Mary's Island

Sale price

Ten year median sale price trend for each property type in St Mary's Island.
Year	Detached	Flats	Semi-Detached	Terraced
2016	£475,000	£200,000	£324,498	£360,000
2017	£410,000	£196,250	£484,995	£327,500
2018	£525,000	£208,248	£380,000	£417,000
2019	£435,000	£240,000	£345,000	£388,000
2020	£466,500	£235,000	£344,950	£359,950
2021	£447,500	£239,975	£375,000	£405,000
2022	£555,000	£235,000	£422,500	£454,975
2023	£560,750	£272,500	£461,500	£450,000
2024	£435,500	£218,000	£465,000	£417,500
2025	£490,000	£205,000	£405,000	£360,000
2026	£488,750	£157,875	£637,500	£330,000

Price per sq ft

Ten year median sale price per square foot trend for each property type in St Mary's Island.
Year	Detached	Flats	Semi-Detached	Terraced
2016	£284	£318	£324	£293
2017	£274	£324	£270	£326
2018	£335	£326	£304	£286
2019	£330	£343	£335	£280
2020	£349	£324	£339	£307
2021	£364	£332	£348	£311
2022	£414	£336	£386	£338
2023	£406	£405	£372	£344
2024	£405	£327	£358	£353
2025	£417	£333	£413	£394
2026	£304	£317	£401	£458

Price distribution by property typelast 12 months

Data Sources

All data is sourced from official UK government agencies and public datasets. Last updated: 16/07/2026. Read more about how our statistics are calculated.

HM Land Registry • Police.uk • DfE • ONS • TfL • National Rail