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21 Clos Thomas, Old St Mellons, Cardiff, CF3 6YR

EPC B

Estimated value

£277,000

  • Since the 2020 sale (£220,995)+25%
  • Against CF3 6YR's recent median (£330,000)-16%

Newest record on this page: February 2026. Land Registry and EPC registers update monthly, so this page can trail them by 2–3 months.

Learn about this valuation
Property type
End terrace
Floor area
71 m²
764 sq ft
Energy rating
B
Score 82
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Valuation

About this valuation

How the figure is worked out and what it's based on. If you know this home, you can tell other visitors what you think it's worth.

Our estimate

£277,000

  • Against its 2020 sale (£220,995)+25%
  • Against CF3 6YR's recent median (£330,000)-16%

Your note and figure are shown publicly on this page.

How the estimate is made

The estimate for 21 Clos Thomas is modelled from its 71 m² EPC floor area, its 1 recorded sale and recent sales of comparable homes in CF3 6YR. It is an automated estimate, not a survey or mortgage valuation: condition, layout and improvements that aren't on record can move the real figure either way.

What it's based on

  • Floor area

    71 m² from the EPC lodged in November 2020

  • Sales of this home

    1 sale recorded, the latest in 2020

  • Recent sales in CF3 6YR

    5 sales, median £330,000 (2026–2025)

This page or the full report?

DataThis pageFull report
SalesLatest sale shown: February 2026Latest available records, read when you order
ValuationEstimate from the last refreshAnalysed against comparable sales
PlanningNone on this homeFull history, plus nearby schemes
Flood riskNot shownIncluded
Price

Sales history & valuation

Every recorded sale of this home, how its price has moved, and what neighbouring properties have sold for.

The latest sale landed in the post-pandemic price surge — useful context when reading the figure.

Sales timeline

  1. 10 December 2020Most recent

    £220,995

Median price across the last 5 sales in CF3 6YR: £330,000 (2026–2025).

Risks

What this page doesn't show

1 potential issue has already been flagged for 21 Clos Thomas, Old St Mellons, Cardiff, CF3 6YR. The detail, evidence and what to ask about it are in the Risks Report.
  • Larger development activity nearbyIn report
  • Flood risk from rivers, sea and surface waterIn report
  • Subsidence and ground-stability signalsIn report
  • Refusals, enforcement and big schemes nearbyIn report

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Overview

About 21 Clos Thomas

A plain-English summary derived from public records, EPC certificates, sold prices and local data.

21 Clos Thomas is an end-of-terrace house in Old St. Mellons, Cardiff, Cardiff (CF3 6YR). It has a recorded floor area of 71 m² (around 764 sq ft). The latest certificate (November 2020) returns a B (score 82), comfortably above the UK average. The recommended improvements would push it to A (score 95).

Today's modelled estimate of £277,000 is 25.3% above the 2020 sale price. Sold December 2020 for £220,995.

Before you decide

Everything you need to know about 21 Clos Thomas

The true value, the hidden risks and the full sale history, in one report.

Larger development activity nearby

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Preview of the full property report

The data behind every report

  • HM Land Registry, source of sold price history
  • Department for Education, source of schools data
  • Police.uk, source of crime statistics
  • Department for Transport, source of stations and transport links
  • Environment Agency, source of flood risk data
  • Department for Environment, Food & Rural Affairs, source of road noise data
  • PlanIt, source of planning application records
Energy

Energy performance

Every EPC certificate filed against this property — current rating, recorded improvements, and where there's headroom to reach a higher band.

21 Clos Thomas's carbon output is low for the local stock.

Current Certificate
Nov 2020

EPC Rating

A
B
B82
C
D
E
F
G
Main Heating
Gas
Main Fuel
Gas
Hot Water
Good
Windows
Very Good
CO2 Emissions
1.2 t/year
Occupancy
—

Certificate validity

Valid until 5 November 2030

3 years remaining
Planning

Planning history

Applications and permits filed against 21 Clos Thomas, Old St Mellons, Cardiff, CF3 6YR, sourced from the PlanIt planning register.

21 Clos Thomas has no planning applications on record.

1

But the area is active

1 notable application nearby — larger schemes and conversions that could reshape the street. The report maps them all.

On the street

Versus other Clos Thomas homes

Four headline reads against 44 similar houses on this street, drawn from the latest EPC and Land Registry data.

Price per m²

£3,113

Street avg £3,302

Below

Floor Area

71 m²

Street avg 87 m²

Below

CO₂ Emissions

1.2 t/year

Street avg 1.4 t/year

Above

Years Held

6 years

Street avg 5 years

Above
Area

The neighbourhood at a glance

A condensed read of the local area. Each tile links through to the full breakdown on the Cardiff district page.
Full Cardiff report

Crime

242/mo

Falling year-on-year across the wider district.

Nearest stop

0.2 km

Rogers Avenue — bus stop.

Nearest stops

  • Rogers AvenueBus stop192m
  • Mortimer AvenueBus stop250m
  • Heol Booths 3Bus stop363m
  • Heol Booths 2Bus stop395m

Most reported crime locally

  • Violence & Sexual Offences1,550 reports36%
  • Anti-social Behaviour627 reports14%
  • Public Order468 reports11%
  • Criminal Damage & Arson424 reports10%

Go deeper on the local area

A Local Area report breaks down crime, transport links, schools and air quality in depth.

SDL Surveying

Get a survey for this property

Level 2 HomeBuyer Report

End-Terrace HouseEPC B

We've checked 10 risk factors against the available data for this property and believe a Level 2 HomeBuyer Report could be a suitable option for you.

From £545 · Includes VAT

Comparables

Similar properties nearby

A handful of close matches in the same postcode area, ranked by likeness on bedrooms, type and floor area.
£278k

1 Ffordd Crabtree, Old St Mellons

CF3 6AN

£280k

1 Lewis Crescent, Old St Mellons

CF3 6YQ

£273k

1 Rhodfa Price, Old St Mellons

CF3 6BD

£271k

1 Clos Grehan, Old St Mellons

CF3 6BF

£294k

1 Druidstone House, Druidstone Road, Old St Mellons

CF3 6XF

2 bed1 bath
£296k

1 Bridge Terrace, Michaelston Y Fedw

CF3 6YZ

3 bed
£302k

1 Potter Street, Old St Mellons

CF3 6AR

3 bed2 bath
£311k

1 Heol Swatridge, Old St Mellons

CF3 6AP

3 bed2 bath

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Method

How to read this page

Where every figure above comes from, how current it is and what it can't tell you.
Valuation method in detail
How the estimate is made
The estimate for 21 Clos Thomas is modelled from its 71 m² EPC floor area, its 1 recorded sale and recent sales of comparable homes in CF3 6YR. It is an automated estimate, not a survey or mortgage valuation: condition, layout and improvements that aren't on record can move the real figure either way.
Where sold prices come from
Sold prices are HM Land Registry Price Paid Data, which covers residential sales in England and Wales since 1995. 1 sale is recorded for 21 Clos Thomas. Sales normally appear two to three months after completion, so the most recent ones take time to show up anywhere.
Reading the EPC
Energy Performance Certificates rate homes from A (most efficient) to G and last 10 years. The latest one for 21 Clos Thomas was lodged in November 2020 at band B and is valid until November 2030. Floor area, heating and insulation details on this page come from it.
Planning records
Planning applications are collected from local authority registers through PlanIt. None is matched to 21 Clos Thomas. Councils sometimes file applications under a different address format, and applications on neighbouring land aren't listed here; the report covers both.
Area figures
Crime is police-recorded street-level data over the last 18 months, which places each incident at an approximate point. Schools and stops are measured in a straight line from CF3 6YR.
FAQ

Common questions

The questions buyers, sellers and homeowners most often ask about 21 Clos Thomas, Old St Mellons, Cardiff, CF3 6YR. Each answer is also embedded as structured data for search engines.

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