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

EPC B

Estimated value

£213,000

  • Since the 2021 sale (£185,000)+15%
  • Against CF3 6AQ's recent median (£255,000)-16%

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

Learn about this valuation
Property type
Mid terrace
Floor area
51 m²
549 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

£213,000

  • Against its 2021 sale (£185,000)+15%
  • Against CF3 6AQ's recent median (£255,000)-16%

Your note and figure are shown publicly on this page.

How the estimate is made

The estimate for 9 Heol Williams is modelled from its 51 m² EPC floor area, its 2 recorded sales and recent sales of comparable homes in CF3 6AQ. 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

    51 m² from the EPC lodged in November 2018

  • Sales of this home

    2 sales recorded, the latest in 2021

  • Recent sales in CF3 6AQ

    5 sales, median £255,000 (2026–2025)

This page or the full report?

DataThis pageFull report
SalesLatest sale shown: March 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. 1 February 2021Most recent

    £185,000

    +19.4%over 2 years

  2. 21 December 2018

    £155,000

Median price across the last 5 sales in CF3 6AQ: £255,000 (2026–2025).

Risks

What this page doesn't show

1 potential issue has already been flagged for 9 Heol Williams, Old St Mellons, Cardiff, CF3 6AQ. 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 9 Heol Williams

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

9 Heol Williams is a mid-terrace house in Old St. Mellons, Cardiff, Cardiff (CF3 6AQ). It has a recorded floor area of 51 m² (around 549 sq ft). The latest certificate (November 2018) returns a B (score 82), comfortably above the UK average. The recommended improvements would push it to A (score 98).

At 51 m² it sits well below the postcode median (90 m² across 57 EPCs), making it one of the more compact homes locally. Across 2018–2021, sale prices on this property compounded at 8.7% per year. Today's modelled estimate of £213,000 is 15.1% above the 2021 sale price. On a £-per-square-foot basis, the last sale (£337/sq ft) was about 17.1% above the typical sold price in the postcode. Last sale on file: £185,000 in February 2021. That sale was during the post-pandemic price surge, when transactions cleared materially above pre-2020 trend.

Before you decide

Everything you need to know about 9 Heol Williams

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.

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

Current Certificate
Nov 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
0.9 t/year
Occupancy
—

Certificate validity

Valid until 22 November 2028

2 years remaining
Planning

Planning history

Applications and permits filed against 9 Heol Williams, Old St Mellons, Cardiff, CF3 6AQ, sourced from the PlanIt planning register.

9 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.

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.

9 Heol Williams outperforms the street on co₂ emissions by a wide margin.

Price per m²

£3,627

Street avg £3,147

Above

Floor Area

51 m²

Street avg 81 m²

Strongly below

CO₂ Emissions

0.9 t/year

Street avg 1.3 t/year

Strongly above

Years Held

6 years

Street avg 5 years

On par
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.

Nearest stops

  • Rogers AvenueBus stop101m
  • Heol Booths 1Bus stop138m
  • Heol Booths 2Bus stop155m
  • Mortimer AvenueBus stop164m

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

Mid-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.
£197k

1 Ffordd Williamson, Old St Mellons

CF3 6AE

£243k

1 Boyce Way, Old St Mellons

CF3 6AB

£271k

1 Clos Grehan, Old St Mellons

CF3 6BF

£273k

1 Rhodfa Price, Old St Mellons

CF3 6BD

£278k

1 Ffordd Crabtree, Old St Mellons

CF3 6AN

£280k

1 Lewis Crescent, Old St Mellons

CF3 6YQ

£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

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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 9 Heol Williams is modelled from its 51 m² EPC floor area, its 2 recorded sales and recent sales of comparable homes in CF3 6AQ. 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. 2 sales are recorded for 9 Heol Williams. 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 9 Heol Williams was lodged in November 2018 at band B and is valid until November 2028. 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 9 Heol Williams. 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 6AQ.
FAQ

Common questions

The questions buyers, sellers and homeowners most often ask about 9 Heol Williams, Old St Mellons, Cardiff, CF3 6AQ. Each answer is also embedded as structured data for search engines.

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