How much is 42 Heol Isaf, Radyr, Cardiff, CF15 8DY worth?
Estimated value — November 2026
£671,000
Likely range £524,000 – £785,000Four in five similar homes sold within their range when we tested it.
Latest recorded sale July 1997
61%
confidence
Medium
Typically within 10% of the sale price
Property details
Semi-detached house
Heol Isaf · Cardiff · CF15 8DY
Address
- District
- Cardiff
- County
- Cardiff
Value over time
- Modelled value
- Projected
- Likely range (80%)
- Today's estimate
Drawn through each of this property's recorded sales and ending at today's estimate, with the UK House Price Index for its area and property type filling in the months between. The shaded band is where four in five prices fell when we tested this line against real sales of similar homes; it widens the further a month is from a recorded sale, and today it matches the likely range above.
View as a table
| Year | Modelled value | Likely range |
|---|---|---|
| 2000 | £195,735 | £167,064 – £225,762 |
| 2001 | £223,845 | £189,098 – £258,905 |
| 2002 | £275,816 | £230,734 – £320,717 |
| 2003 | £325,003 | £269,606 – £378,434 |
| 2004 | £394,679 | £325,292 – £458,979 |
| 2005 | £399,914 | £327,355 – £465,217 |
| 2006 | £419,090 | £340,111 – £488,796 |
| 2007 | £425,714 | £342,528 – £498,055 |
| 2008 | £378,526 | £302,354 – £444,206 |
| 2009 | £386,755 | £307,739 – £455,654 |
| 2010 | £392,911 | £312,355 – £464,381 |
| 2011 | £401,706 | £318,735 – £477,242 |
| 2012 | £400,071 | £317,142 – £476,553 |
| 2013 | £410,612 | £359,835 – £449,990 |
| 2014 | £447,675 | £388,942 – £493,223 |
| 2015 | £463,664 | £399,341 – £513,547 |
| 2016 | £476,473 | £406,784 – £530,517 |
| 2017 | £499,938 | £423,051 – £559,564 |
| 2018 | £519,841 | £435,977 – £584,878 |
| 2019 | £536,099 | £445,574 – £606,302 |
| 2020 | £548,843 | £452,032 – £623,921 |
| 2021 | £598,301 | £488,259 – £683,639 |
| 2022 | £663,892 | £536,786 – £762,464 |
| 2023 | £647,962 | £519,025 – £747,954 |
| 2024 | £650,982 | £516,540 – £755,243 |
| 2025 | £659,966 | £518,698 – £769,521 |
| 2026 | £671,000 | £524,000 – £785,000 |
Sale history
Mortgage calculator
£3,601
Estimated monthly repayment
£603,900
Loan amount
£692,566
Total interest
£1,296,466
Total repayable
A guide only, based on a capital repayment mortgage held at a constant interest rate for the full term. Not a mortgage offer or financial advice.
Related properties
About this property
42 Heol Isaf, Radyr, Cardiff, CF15 8DY is a semi-detached house on Heol Isaf in Cardiff. Stede's estimated value for November 2026 is £671,000. Four in five similar homes sold within their likely range when tested; for this property that range is £524,000 to £785,000. It combines its own last sale brought up to date with the House Price Index (75%) and recent sales of 59 similar homes in the same postcode sector (25%). The confidence score is 61 out of 100 (medium): estimates like this one are typically within 10% of the eventual sale price.
It last sold in July 1997 for £149,500. The current estimate is 349% higher than that price. The current owner has held it for about 29 years.
The modelled value is up 2% over the past year and up 13% over the past five years.
Among 4 nearby properties Stede tracks in the CF15 area, estimated values run from £1,105,000 to £1,402,000. This semi-detached house's £671,000 sits below that range.
Common questions
How much is 42 Heol Isaf, Radyr, Cardiff, CF15 8DY worth?
Stede estimates 42 Heol Isaf, Radyr, Cardiff, CF15 8DY is worth £671,000 as of November 2026, within a likely range of £524,000 to £785,000. The estimate is generated automatically from recorded sale prices of this and similar nearby homes and the UK House Price Index, and is not a formal valuation.
When did 42 Heol Isaf, Radyr, Cardiff, CF15 8DY last sell?
It last sold in July 1997 for £149,500.
What type of property is 42 Heol Isaf, Radyr, Cardiff, CF15 8DY?
It is recorded as a Semi-detached house on Heol Isaf in the CF15 postcode area.
How reliable is this estimate?
The confidence score is 61 out of 100 (medium). Tested against real sales of similar homes, estimates like this one are typically within 10% of the sale price, and four in five sold within their likely range. The figure is a data model, not a RICS valuation or Home Report, and should not be used for mortgage or legal decisions.
How does Stede calculate this estimate?
It combines its own last sale brought up to date with the House Price Index (75%) and recent sales of 59 similar homes in the same postcode sector (25%). Each piece of evidence gets the share that proved most accurate when tested against real sales of similar homes, and the same testing sets the likely range and confidence. Full detail is on the methodology page.
How we got this figure
We weighed the evidence below, giving each piece the share that proved most accurate when we tested it against real sales of similar homes. The likely range and confidence come from testing the same method against 58,473 real sales of similar homes.
- Its sale in July 1997, brought up to today with the House Price Index£773,63775%
- 59 similar homes sold recently in the same postcode sector£364,32925%
Estimate £671,000, likely £524,000 – £785,000
Read the full methodology and data sources →