How much is 1 William Street, Cardiff, CF11 9JX worth?
Estimated value — September 2026
£158,000
Likely range £155,000 – £161,000
Latest recorded sale May 2001
3%
confidence
Low
Property details
Flat / Maisonette
William Street · Cardiff · CF11 9JX
Energy performance
Electricity (Not Community) · EPC 9180-2407-0190-2090-2075 · inspected November 2020
Address
- District
- Cardiff
- County
- Cardiff
Value over time
- Modelled value
- Recorded sale
- Today's estimate
Modelled by indexing this property's most recent recorded sale, month by month, against the UK House Price Index for its area and property type. Earlier sales are shown as recorded. Today's estimate also blends in the other valuation methods, so it can sit a little off the line.
View as a table
| Year | Modelled value | Recorded sale |
|---|---|---|
| 2000 | £52,211 | — |
| 2001 | £61,671 | £55,000 |
| 2002 | £77,211 | — |
| 2003 | £91,959 | — |
| 2004 | £114,124 | — |
| 2005 | £116,317 | — |
| 2006 | £119,859 | — |
| 2007 | £122,409 | — |
| 2008 | £107,789 | — |
| 2009 | £106,688 | — |
| 2010 | £104,969 | — |
| 2011 | £107,098 | — |
| 2012 | £105,936 | — |
| 2013 | £108,404 | — |
| 2014 | £118,196 | — |
| 2015 | £121,546 | — |
| 2016 | £127,634 | — |
| 2017 | £134,307 | — |
| 2018 | £137,172 | — |
| 2019 | £139,259 | — |
| 2020 | £139,617 | — |
| 2021 | £152,658 | — |
| 2022 | £166,722 | — |
| 2023 | £162,731 | — |
| 2024 | £163,730 | — |
| 2025 | £162,796 | — |
| 2026 | £161,216 | — |
Sale history
Mortgage calculator
£750
Estimated monthly repayment
£142,200
Loan amount
£127,936
Total interest
£270,136
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
1 William Street, Cardiff, CF11 9JX is a flat on William Street in Cardiff. Stede's estimated value for September 2026 is £158,000. The likely range is £155,000 to £161,000. It is the average of 2 independent methods that re-index recorded sale prices to today. The confidence score is 3 out of 100 (low), based on how recent the most recent recorded sale is.
It last sold in May 2001 for £55,000. It has 2 sales on record, the earliest in 1998. The current estimate is 187% higher than that price. The current owner has held it for about 25 years.
Its EPC energy-efficiency rating is band E (42 out of 100), with a potential of band C (73) after the recommended improvements. The certificate records a total floor area of 39 m² (420 sq ft). It was lodged in November 2020.
The modelled value is unchanged over the past year and up 6% over the past five years.
Among 5 nearby properties Stede tracks in the CF11 area, estimated values run from £196,000 to £384,000. This flat's £158,000 sits below that range.
Common questions
How much is 1 William Street, Cardiff, CF11 9JX worth?
Stede estimates 1 William Street, Cardiff, CF11 9JX is worth £158,000 as of September 2026, within a likely range of £155,000 to £161,000. The estimate is generated automatically from recorded sale prices and the UK House Price Index, and is not a formal valuation.
When did 1 William Street, Cardiff, CF11 9JX last sell?
It last sold in May 2001 for £55,000. There are 2 sales on record, the earliest in 1998.
What type of property is 1 William Street, Cardiff, CF11 9JX?
It is recorded as a Flat / Maisonette on William Street in the CF11 postcode area.
What is the EPC rating of 1 William Street, Cardiff, CF11 9JX?
1 William Street, Cardiff, CF11 9JX has an EPC energy-efficiency rating of band E (42 out of 100). Its potential rating after the recommended improvements is band C (73). The certificate records a floor area of 39 m² (420 sq ft). EPC data is published by the Ministry of Housing, Communities & Local Government and reflects the most recent certificate on record.
How reliable is this estimate?
The confidence score is 3 out of 100 (low), which reflects how recent the most recent recorded sale is rather than local market volatility. 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?
Stede runs 2 independent methods that re-index this property's recorded sale prices to today using the House Price Index for its type and region, then takes the average. Full detail is on the methodology page.
How we calculated this
This estimate averages 2 valuation methods, each re-indexing recorded sale prices to today. The confidence score reflects how recent the most recent recorded sale is.
2
Valuation methods used
2
Recorded sales on file
2001
Most recent recorded sale