What type of property is Flat 21, 1 William Street, SL1 1GZ?

Flat 21, 1 William Street, SL1 1GZ is a mid-terrace house.

What was the last sold price for Flat 21, 1 William Street, SL1 1GZ?

Flat 21, 1 William Street, SL1 1GZ last sold for £235,000 in December 2021, around 4 years ago. Source: HM Land Registry.

What is the EPC rating for Flat 21, 1 William Street, SL1 1GZ?

The current EPC rating for Flat 21, 1 William Street, SL1 1GZ is B with a score of 82 out of 100, lodged in January 2021. Source: EPC Register.

What is the floor area of Flat 21, 1 William Street, SL1 1GZ?

Flat 21, 1 William Street, SL1 1GZ has a recorded floor area of 46 m² (495 sq ft). Source: EPC Register.

Where is Flat 21, 1 William Street, SL1 1GZ located?

Flat 21, 1 William Street, SL1 1GZ sits in Slough. It falls within the SL1 postcode district.

What is crime like near Flat 21, 1 William Street, SL1 1GZ?

Police records around Flat 21, 1 William Street, SL1 1GZ show an average of 18 reported crimes per month over the last 13 months. Violent crime makes up roughly 45% of reports, the most common category. The overall trend is rising (24% versus the prior period). Source: Police UK.

Which schools serve Flat 21, 1 William Street, SL1 1GZ?

The closest primary school to Flat 21, 1 William Street, SL1 1GZ is St Mary's Church of England Primary School (865m), one of 18 primaries within walking distance. The closest secondary is Slough and Eton Church of England Business and Enterprise College (816m), with 13 secondaries in the surrounding area.

How well connected is Flat 21, 1 William Street, SL1 1GZ?

The closest bus stop to Flat 21, 1 William Street, SL1 1GZ is Wellington Street stop E, 58m away. The nearest bus option is Brunel Way, 299m away.

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Flat 21, 1 William Street, Slough, SL1 1GZ

EPC B

Property type

Mid terrace

Floor 2

Floor area

46 m²

495 sq ft

Energy rating

Score 82

Overview

About Flat 21

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

Flat 21 is a mid-terrace house in Slough (SL1 1GZ). It has a recorded floor area of 46 m² (around 495 sq ft). The latest certificate (January 2021) returns a B (score 82), comfortably above the UK average. At 46 m² this is the 36th smallest of 64 units on EPC record in the building, where floor areas span 36–62 m². The building's EPC ratings span C to B, with this unit at the top.

Most recent transfer: December 2021 at £235,000. That sale was during the post-pandemic price surge, when transactions cleared materially above pre-2020 trend.

Before you decide

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Signs of HMO activity in the areaLarger development activity nearby

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Energy

Energy performance

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

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

EPC Rating

B82

Main Heating

—

Main Fuel

—

Hot Water

Good

Windows

Very Good

CO2 Emissions

0.7 t/year

Occupancy

—

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2nd Floor FlatEPC B

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Planning

Planning history

Applications and permits filed against Flat 21, 1 William Street, Slough, SL1 1GZ, sourced from the PlanIt planning register.

Flat 21 has no planning applications on record.

But the area is active

12 notable applications 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.

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

Current estimate

£212,000

Modelled from EPC, postcode comparables.

See how we calculated this

Last sold (2021)

£235,000

Recorded with HM Land Registry.

Sales timeline

16 December 2021Most recent
£235,000

Median price across the last 5 sales in SL1 1GZ: £202,500 (2024–2023).

Nearby sales in SL1 1GZ

On the street

Versus other William Street homes

Four headline reads against 63 similar flats on this street, drawn from the latest EPC and Land Registry data.

Flat 21 outperforms the street on years held by a wide margin.

Price per m²

£5,109

Street avg £4,633

On par

Floor Area

46 m²

Street avg 49 m²

On par

CO₂ Emissions

0.7 t/year

Street avg 0.8 t/year

Above

Years Held

4 years

Street avg 4 years

Strongly above

Before you decide

Everything you need to know about Flat 21

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

Signs of HMO activity in the areaLarger development activity nearby

Pick your report · every report is £14.99

One time fee only - money back guarantee

The data behind every report

Comparables

Similar properties nearby

Rising year-on-year across the wider district.

Nearest stop

0.1 km

Wellington Street stop E — bus stop.

Closest school

0.8 km

Slough and Eton Church of England Business and Enterprise College. 31 schools nearby.

Go deeper on the local area

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

Noise

Road noise across the postcode

Modelled day and night-time noise levels around SL1 1GZ from Defra's strategic mapping. The pin marks this postcode's centroid.

Daytime· 07:00 – 23:00

53.8dB

Low

Night-time road noise heatmap for SL1 1GZ

Night-time· 23:00 – 07:00

44.4dB

Low

55 dB

60 dB

65 dB

70 dB

75 dB

80 dB

Defra Road Noise Strategic Mapping, Round 4

FAQ

Common questions

The questions buyers, sellers and homeowners most often ask about Flat 21, 1 William Street, Slough, SL1 1GZ. Each answer is also embedded as structured data for search engines.