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20 Allen Close, Old St Mellons, Cardiff, CF3 5DH

5 sales on record2 planning records

Estimated value

£253,000

  • Since the 2024 sale (£195,000)+30%
  • Against CF3 5DH's recent median (£258,000)-2%

Newest record on this page: June 2025. Land Registry and EPC registers update monthly, so this page can trail them by 2–3 months.

Learn about this valuation
Property type
Detached
Bedrooms
3
Bathroom
1
Floor area
55 m²
592 sq ft
Energy rating
C
Score 76
Council tax
Band E
Tenure
Owner Occupied
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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

£253,000

  • Against its 2024 sale (£195,000)+30%
  • Against CF3 5DH's recent median (£258,000)-2%

Your note and figure are shown publicly on this page.

How the estimate is made

The estimate for 20 Allen Close is modelled from its 55 m² EPC floor area, its 5 recorded sales and recent sales of comparable homes in CF3 5DH. 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

    55 m² from the EPC lodged in April 2024

  • Sales of this home

    5 sales recorded, the latest in 2024

  • Recent sales in CF3 5DH

    5 sales, median £258,000 (2025–2020)

This page or the full report?

DataThis pageFull report
SalesLatest sale shown: June 2025Latest available records, read when you order
ValuationEstimate from the last refreshAnalysed against comparable sales
Planning1 of 2 applicationsFull 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.

20 Allen Close has more than doubled in price since the earliest registered sale in 1997.

Sales timeline

  1. 17 April 2024Most recent

    £195,000

  2. 16 September 2010

    £195,000

    +14.7%over 5 years

  3. 28 January 2005

    £169,950

    +99.9%over 4 years

  4. 18 May 2000

    £85,000

    +4.9%over 2 years

  5. 7 November 1997

    £81,000

Median price across the last 5 sales in CF3 5DH: £258,000 (2025–2020).

Risks

What this page doesn't show

Nothing is flagged from the data on this page, but these checks are only run in the report. The detail, evidence and what to ask about it are in the Risks Report.
  • Flood risk from rivers, sea and surface waterIn report
  • Subsidence and ground-stability signalsIn report
  • Refusals, enforcement and big schemes nearbyIn report

One time fee only - money back guarantee

Overview

About 20 Allen Close

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

20 Allen Close is a three-bedroom detached house in Old St. Mellons, Cardiff, Cardiff (CF3 5DH). It has a recorded floor area of 55 m² (around 592 sq ft), construction records dating it to 1996-2002 and council tax band E. The latest certificate (April 2024) shows a C (score 76), near the top of the C band. When first surveyed in October 2008 the rating was D, the property has climbed 1 band since. Between certificates, lighting went from Very Poor to Very Good. The recommended improvements would push it to B (score 91).

At 55 m² it sits well below the postcode median (99 m² across 24 EPCs), making it one of the more compact homes locally. 2 planning records sit against the property, 2 approved, 0 refused. Past consents include a loft conversion, an extension and a porch, meaningful when judging how the property has evolved. Across 1997–2024, sale prices on this property compounded at 3.4% per year. Today's modelled estimate of £253,000 is 29.7% above the 2024 sale price. On a £-per-square-foot basis, the last sale (£329/sq ft) was about 154.5% above the typical sold price in the postcode. Last sale on file: £195,000 in April 2024.

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
  • Bathrooms1

Outside

  • Private gardenYes
Before you decide

Everything you need to know about 20 Allen Close

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

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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.

20 Allen Close's carbon output is low for the local stock.

Current Certificate(1 of 5)
Apr 2024

EPC Rating

A
B
C
C76
D
E
F
G
Main Heating
Gas
Main Fuel
Gas
Hot Water
Good
Windows
Good
CO2 Emissions
1.5 t/year
Occupancy
Owner Occupied

Certificate validity

Valid until 30 April 2034

7 years remaining

Property Improvements

Changes detected from historical EPC data

Oct 2013from Aug 2010
EPC improved fromD64toE54
Hot Water
Main SystemImmersion

Hot water system changed

Floor Insulation
UninsulatedPartial

Floor insulation added or improved

Ventilation
NaturalExtract

Mechanical ventilation installed

Feb 2014from Oct 2013
Low Energy Lighting
18%91%

More low energy lighting installed

Apr 2024from Feb 2014
EPC improved fromE53toC76
Heating Controls
Prog + StatFull

Heating controls upgraded for better temperature management

Hot Water
ImmersionMain System

Hot water system upgraded

Windows
AverageGood

Window efficiency improved

Roof Insulation
PartialInsulated

Roof insulation improved

Floor Insulation
PartialInsulated

Floor insulation added or improved

Ventilation
ExtractNatural

Ventilation system changed

Planning

Planning history

Applications and permits filed against 20 Allen Close, Old St Mellons, Cardiff, CF3 5DH, sourced from the PlanIt planning register.

2 applications on record at 20 Allen Close, Old St Mellons, Cardiff, CF3 5DH

2decisions2extensions71documents
  1. Oct 2014
    PorchFull
    Outcome in report

    Extension: Two storey

    PROPOSED REMOVAL OF EXISTING SIDE ATTACHED GARAGE. PROPOSED TWO STOREY SIDE AND REAR EXTENSION. REAR EXTENSION TO HAVE A FIXED PERGOLA. THE EXISTING FRONT PORCH IS TO BE EXTENDED.

    Extension
    Documents
    59 docs on file
    Reference
    14/01235/DCH
    Full record in report
  2. More recent applications — locked
  3. Loft ConversionDecision

Unlock 20 Allen Close, Old St Mellons, Cardiff, CF3 5DH's full planning history

You're seeing the shape of it. The report has the substance.

  • Every decision — granted, refused or withdrawn (2 on record)
  • All 2 applications on this property in full
  • The 71 documents, officer reports & conditions
  • What the pattern means for extending or converting here
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On the street

Versus other Allen Close homes

Four headline reads against 24 similar houses on this street, drawn from the latest EPC and Land Registry data.

20 Allen Close outperforms the street on epc rating by a wide margin.

Price per m²

£3,545

Street avg £2,269

Strongly above

Floor Area

55 m²

Street avg 101 m²

Strongly below

Habitable Rooms

3 rooms

Street avg 6 rooms

Strongly below

CO₂ Emissions

1.5 t/year

Street avg 3.7 t/year

Strongly 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

Llaneirwg Way — bus stop.

Nearest stops

  • Llaneirwg WayBus stop176m
  • Vaindre LaneBus stop360m
  • Wern Fawr LaneBus stop377m
  • Tyrwinch RoadBus stop407m

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

Late 20th centuryDetached HouseEPC C

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.
£264k

1 Brendon Close, Llanrumney

CF3 5RJ

3 bed1 bath
£269k

1 Axbridge Crescent, Llanrumney

CF3 5TJ

3 bed
£200k

1 Bronte Close, Llanrumney

CF3 5PN

3 bed
£197k

1 Banwell Place, Llanrumney

CF3 5SH

3 bed
£150k

1 Bluebell Drive

CF3 5RA

3 bed
£443k

1 Chapel Row Lane, Old St Mellons

CF3 5ST

3 bed
£263k

1 Captain S View, Braunton Crescent, Llanrumney

CF3 5AD

2 bed1 bath
£538k

1 Courtenay Close, Old St Mellons

CF3 5UL

4 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 20 Allen Close is modelled from its 55 m² EPC floor area, its 5 recorded sales and recent sales of comparable homes in CF3 5DH. 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. 5 sales are recorded for 20 Allen Close. 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 20 Allen Close was lodged in April 2024 at band C and is valid until April 2034. 5 certificates are on record, which shows how the home has changed.
Planning records
Planning applications are collected from local authority registers through PlanIt. 2 applications are matched to 20 Allen Close. 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 5DH.
Council tax band
20 Allen Close is in council tax band E. Bands are set by the Valuation Office Agency from historic values (1 April 1991 in England, 1 April 2003 in Wales), not today's price; the amount you pay depends on the council's rate for the band.
FAQ

Common questions

The questions buyers, sellers and homeowners most often ask about 20 Allen Close, Old St Mellons, Cardiff, CF3 5DH. Each answer is also embedded as structured data for search engines.

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