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21 Heol Williams, Old St Mellons, Cardiff, CF3 6AQ

EPC B
Property type
End terrace
Bedrooms
3
Bathrooms
3
Floor area
71 m²
764 sq ft
Energy rating
B
Score 82
Tenure
Freehold
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Overview

About 21 Heol Williams

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

21 Heol Williams is a three-bedroom end-of-terrace house in Old St. Mellons, Cardiff, Cardiff (CF3 6AQ). It has a recorded floor area of 71 m² (around 764 sq ft). Tenure is freehold. The latest certificate (December 2018) returns a B (score 82), comfortably above the UK average. The recommended improvements would push it to A (score 95). The home occupies a cul-de-sac position.

Most recent transfer was November 2025 at £255,000 — fresh data. Across 2018–2025, sale prices on this property compounded at 2.2% per year. Today's modelled estimate of £286,000 is 12.2% above the 2025 sale price. On a £-per-square-foot basis, the last sale (£334/sq ft) was about 16.3% above the typical sold price in the postcode. At 71 m² it's 21.1% smaller than the typical home in the postcode (90 m² median across 57 EPCs).

Specifications

What this property has

Pulled from EPC certificates, claim submissions and our property model. Empty categories are hidden — we only show what's known.

Inside

  • Bedrooms3
  • Bathrooms3
  • Dining roomYes
  • CloakroomYes
  • EnsuiteYes

Outside

  • Private gardenRear
  • DrivewayYes
  • Cul-de-sacYes

Building

  • TenureFreehold
Before you decide

Everything you need to know about 21 Heol Williams

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

Larger development activity nearby

Pick your report · from £14.99

One time fee only - money back guarantee

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 Heol Williams's carbon output is low for the local stock.

Current Certificate
Dec 2018

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 12 December 2028

2 years remaining
SDL Surveying

Get a survey for this property

Level 2 HomeBuyer Report

End-Terrace HouseFreeholdEPC 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

Planning

Planning history

Applications and permits filed against 21 Heol Williams, Old St Mellons, Cardiff, CF3 6AQ, sourced from the PlanIt planning register.

21 Heol Williams 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.

Price

Sales history & valuation

Recorded transactions, our model's current estimate, and a quick read on what neighbouring properties have sold for.
Current estimate

£286,000

Modelled from EPC, postcode comparables and a sale-price growth of 2.2% per year over 7 years.

See how we calculated this
Last sold (2025)

£255,000

Growth on file: 2.2% per year over 7 years.

Sales timeline

  1. 28 November 2025Most recent

    £255,000

    +15.9%over 6 years

  2. 21 December 2018

    £219,995

Median price across the last 5 sales in CF3 6AQ: £250,000 (2026–2025).

On the street

Versus other Heol Williams homes

Four headline reads against 57 similar houses on this street, drawn from the latest EPC and Land Registry data.

21 Heol Williams is notably below the street on years held.

Price per m²

£3,592

Street avg £3,147

Above

Floor Area

71 m²

Street avg 81 m²

Below

CO₂ Emissions

1.2 t/year

Street avg 1.3 t/year

Above

Years Held

1 years

Street avg 5 years

Strongly below
Before you decide

Everything you need to know about 21 Heol Williams

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

Larger development activity nearby

Pick your report · from £14.99

One time fee only - money back guarantee

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
Comparables

Similar properties nearby

A handful of close matches in the same postcode area, ranked by likeness on bedrooms, type and floor area.
£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
£340k

1 Rogers Avenue, Old St Mellons

CF3 6AL

3 bed2 bath
£341k

1 Church Road, Old St Mellons

CF3 6YA

3 bed2 bath
£348k

1 Clos Thomas, Old St Mellons

CF3 6YR

3 bed2 bath
£352k

1 Began Road, Old St Mellons

CF3 6XJ

3 bed1 bath
£352k

1 Rhodfa Hughes, Old St Mellons

CF3 6YY

3 bed2 bath
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

0.1 km

Rogers Avenue — bus stop.

Go deeper on the local area

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

FAQ

Common questions

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