Detached
£950,000
137% above the St Mary's average
5.7% of sales
What is the average house price in St Mary's? £400,359
The average house price in St Mary's is £400,359, based on 42 homes sold in the 12 months to August 2026. Prices are up 5.3% (£20,075) on a year earlier.
- 1 year change
- +5.3%
- Sold in 12 months
- 42
- Data up to
- August 2026
Sold prices from HM Land Registry, not asking prices. How we calculate this
How much does each type of property cost in St Mary's?
Average sold price by property type, and each type's share of recent sales.
Semi-detached
£440,300
10% above the St Mary's average
59.0% of sales
Terraced
£384,555
4% below the St Mary's average
16.2% of sales
Flats
£223,250
44% below the St Mary's average
19.1% of sales
Are house prices in St Mary's going up or down?
House prices in St Mary's are rising: up 5.3% (£20,075) over the past year. Over the past 10 years, prices are up 53.9% (£140,167).
Past 12 months
+5.3%
+£20,075From £380,284 to £400,359
£405,675£380,284
Past 10 years
+53.9%
+£140,167From £260,192 to £400,359
£400,359£260,192
Quick answers for St Mary's
5 key facts at a glance.
When did prices peak?
£599,995
Highest average, reached in January 2021
How many homes sold?
42
In the last 12 months-27.6% year on year
What sells most often?
Semi-detached houses
59.0% of recent sales
What is the most common price range?
£400k - £500k
51.4% of sales
How does St Mary's rank?
4th most expensive area of Swanley.
Compared with 5 areas
What are the most expensive homes sold in St Mary's?
The highest recorded sale prices in St Mary's, from HM Land Registry.
#1 Most expensive sale
malvern lodge london road, kent
£950,000
Sold December 2025
View house details
How do house prices in St Mary's compare with nearby areas?
St Mary's compared with the 4 nearest other areas in Swanley.
St Mary's vs White Oak
- St Mary's
- £400,359
- White Oak
- £353,815−£46,544
Open comparison
St Mary's vs High Firs
- St Mary's
- £400,359
- High Firs
- £405,521+£5,162
Open comparison
St Mary's vs Christchurch
- St Mary's
- £400,359
- Christchurch
- £408,932+£8,573
Open comparison
St Mary's vs Swanley Village
- St Mary's
- £400,359
- Swanley Village
- £474,500+£74,141
Open comparison
Where does this data come from?
Price information is from HM Land Registry, location boundaries are from OpenStreetMap, and households and population are from Nomis Census 2021 postcode estimates (21 March 2021).
Last updated 30 September 2026 at 03:23 with the latest Land Registry data (August 2026). The St Mary's dataset covers 229 postcodes.
Contains HM Land Registry data © Crown copyright and database right 2026. This data is licensed under the Open Government Licence v3.0.