Photo: Laurel Lodged · CC BY-SA 4.0Since 2015, Castleknock’s home prices have lagged the typical Irish town: up 49% against +129%
Homes in Castleknock sell for a median €519,500. That is the middle of 904 market sales on the Property Price Register from 2023 to 2025. Prices are up 49% on 2015. Rent, income and the Cost of living Grade are on Castleknock’s cost of living page.
86% of the homes sold in Castleknock were second-hand
904 market sales in three years: 123 new homes and 781 second-hand. At the median a new home sold for 4% less.
median sale · 123 sold in 3 years
- 2025 median
- €561K 44 sold
- the typical Irish town
- €419K
median sale · 781 sold in 3 years
- 2025 median
- €557K 255 sold
- 2022 to 2025
- +9.2%
- the typical Irish town
- €326K
median sale · 904 sold in 3 years
- Middle half
- €400K–€715K
- Last 12 months
- €565K 280 sold
- the typical Irish town
- €350K
14% of the sales were new homes
Market sales on the Property Price Register, 2023–25. The register says whether a home was new or second-hand, not its type or size. New homes are filed without VAT; we add back 13.5%. A median needs 30 sales.
Half of Castleknock’s homes sold for between €400K and €715K
One sale in ten was under €325K and one in ten over €1M. 3% sold for under €250K and 56% for €500K or more.
The median, €519,500, sits in the €500–750K band
904 market sales, 2023–25, VAT included. Each bar is the number sold in that price band; the darker bar holds the median.
Prices are up 49% on 2015, a slower rise than the typical Irish town’s
From €327,500 in 2010 to €557,000 in 2025, each the median of that year’s market sales.
About as many homes sell as usual
299 homes sold in 2025. The busiest year was 2013, with 453, and the quietest 2011, with 158.
Castleknock costs more than the typical Irish town
Each year’s median sale: the town, the middle of County Dublin’s towns of 2,500 or more, and the typical Irish town.
New homes and second-hand, year by year
| 2010 | 2015 | 2020 | 2025 | |
|---|---|---|---|---|
| All homes | €328K | €375K | €460K | €557K |
| Typical Irish town | €220K | €170K | €261K | €388K |
| New homes | — | €511K | €525K | €561K |
| Second-hand homes | €330K | €340K | €409K | €557K |
Calendar years; a year’s median needs 30 sales of the kind, so a dash is a year with fewer.
Property Price Register: every market sale placed in the town since 2010, VAT included; a year’s median needs 30 sales. Sales whose address names no town aren’t counted.
14% of the homes sold in Castleknock in three years were new
123 new homes and 781 second-hand ones sold from 2023 to 2025, by the register’s own split.
15% of the homes sold in 2025 were new
Calendar years with 10 or more sales. The share peaked at 61% in 2013.
A new home sold for a median €506,100
against €525,000 for a home sold on, about the same, over three years. New homes are often a different mix from the homes sold on, so part of the gap is size and type.
Filed without VAT
Most new homes are filed on the register without VAT. Every figure here adds back 13.5%, so new and second-hand compare like for like.
Property Price Register, 2023–25: 123 new and 781 second-hand market sales. New homes are filed without VAT; we add back 13.5%.
Phoenix Park Racecourse is Castleknock’s busiest street or estate, with 98 sales in three years
21 streets and estates had 5 or more sales from 2023 to 2025, 8 of them ten or more.
| # | Street or estate | Sales | Median | Homes |
|---|---|---|---|---|
| 1 | Phoenix Park Racecourse | 98 | €500,000 | Mostly new |
| 2 | Carpenterstown Road | 26 | €907,500 | Mixed |
| 3 | Collegewood | 13 | €620,000 | Second-hand |
| 4 | Fernleigh Drive | 13 | €378,000 | Second-hand |
| 5 | Collegefort | 12 | €380,800 | Second-hand |
| 6 | Riverwood Road | 11 | €338,000 | Second-hand |
| 7 | Beechpark Avenue | 10 | €1,235,000 | Second-hand |
| 8 | Pecks Lane | 10 | €632,500 | Second-hand |
| 9 | College Gate | 9 | €995,000 | Mixed |
| 10 | Fernleigh Grove | 9 | €355,000 | Second-hand |
| 11 | Georgian Village | 9 | €2,350,000 | Second-hand |
| 12 | Diswellstown Way | 8 | €785,000 | Second-hand |
| 13 | Park Drive Avenue | 8 | €510,000 | Second-hand |
| 14 | Diswellstown Manor | 7 | €775,000 | Second-hand |
| 15 | Laurel Lodge | 7 | €520,000 | Second-hand |
Georgian Village: €2,350,000
Fernleigh Crescent: €217,000
At the median, the dearest costs 10.8 times the cheapest.
Streets and estates with 5 or more market sales from 2023 to 2025, named as the register’s addresses name them; medians only.
Castleknock is the 40th most expensive of 118 towns in County Dublin
Castleknock is in the middle of County Dublin’s towns to buy in; the typical Irish town’s median is €350,000.
Towns of 1,000 or more in County Dublin, by their median home of 2023–25; * marks a routing-key median (fewer than 30 sales in the town). Each links to its own Housing page.
Cheaper nearby: Ashtown, Carpenterstown and Blanchardstown.
The towns around Castleknock: their median home (2023–25), market sales on the Property Price Register in those three years, the change in ten years and the distance.
| Town | Median sale | Sales, 3 years | Since 2015 | km |
|---|---|---|---|---|
| Castleknock | €520K | 904 | +49% | |
| Ashtown | €399K | 256 | +161% | 2.3 |
| Carpenterstown | €394K | 66 | – | 2.4 |
| Blanchardstown | €333K | 481 | +52% | 2.6 |
| Finglas South | €282K | 50 | – | 3 |
| Chapelizod | €345K | 145 | +60% | 3.3 |
| Ballyfermot | €309K | 316 | +109% | 3.5 |
A routing-key price (fewer than 30 sales in the town) counts for its whole postal area. Rents are each town’s own RTB figure where published, else its district’s, city’s or county’s.
Questions about property prices in Castleknock
What is the average house price in Castleknock?
The median home in Castleknock sold for €519,500 from 2023 to 2025, across 904 market sales on the Property Price Register (€565,000 in the last 12 months).
Are house prices going up in Castleknock?
The median sale was €501,100 in 2024 and €557,000 in 2025: it went up 11%.
How many homes sell in Castleknock each year?
299 sales in Castleknock were filed on the Property Price Register in 2025, against an average of 344 a year over the last ten. Sales whose address names no town aren’t counted, so the true figure is somewhat higher.
How much does a new build cost in Castleknock?
New homes sold for a median €506,100 over three years, against €525,000 for homes sold on. New builds were 14% of sales.
Is Castleknock expensive for County Dublin?
Castleknock is the 39th most expensive of 116 towns of 2,500 or more in County Dublin by median sale price.
Can I see individual sales or prices by street?
Yes: the Property Price Register publishes every residential sale with its address and price at propertypriceregister.ie. This page shows the town’s medians and counts.
Sales: Residential Property Price Register, Property Services Regulatory Authority. House prices by Eircode routing key, RTB rents and household incomes: CSO, CC BY 4.0. Routing-key areas: Autoaddress.
Sources: Property Price Register (PSRA), 2010–2026 · CSO HPA04 house prices by Eircode routing key, 2023–25. Under Creative Commons Attribution 4.0 (CC BY 4.0).
Contains Central Statistics Office (CSO) data, Census 2022, and Tailte Éireann boundaries (CSO Urban Areas, Small Areas, local electoral areas, constituencies), under Creative Commons Attribution 4.0 (CC BY 4.0).