What type of property is 40 Harmer Green Lane, AL6 0AT?

40 Harmer Green Lane, AL6 0AT is a 5-bedroom detached house.

When did 40 Harmer Green Lane, AL6 0AT last change hands?

40 Harmer Green Lane, AL6 0AT last sold for £1,726,000 in December 2021, around 5 years ago. Land Registry has 5 sales on record going back to £412,500 in August 1997. Source: HM Land Registry.

Has 40 Harmer Green Lane, AL6 0AT appreciated in value?

Across 5 sales between August 1997 and December 2021, 40 Harmer Green Lane, AL6 0AT rose from £412,500 to £1,726,000, a change of £1,313,500. That works out to roughly +6.1% per year compounded over 24 years. Source: HM Land Registry.

What energy rating does 40 Harmer Green Lane, AL6 0AT have?

The current EPC rating for 40 Harmer Green Lane, AL6 0AT is C with a score of 72 out of 100, lodged in March 2018. It has improved from a D recorded in April 2010. Source: EPC Register.

What is the floor area of 40 Harmer Green Lane, AL6 0AT?

40 Harmer Green Lane, AL6 0AT has a recorded floor area of 385 m² (4,144 sq ft), around 77 m² per bedroom. That makes it about 62% larger than the median EPC-recorded property in AL6 0AT. Source: EPC Register.

How is 40 Harmer Green Lane, AL6 0AT heated?

The latest EPC at 40 Harmer Green Lane, AL6 0AT records mains gas as the main heating fuel. Source: EPC Register.

Has 40 Harmer Green Lane, AL6 0AT had any planning applications?

40 Harmer Green Lane, AL6 0AT has 5 approved extension applications on file including single-storey side extension and single-storey side and rear extension. The wider record also shows 2 refused applications. Source: PlanIt planning register.

What council tax band is 40 Harmer Green Lane, AL6 0AT?

40 Harmer Green Lane, AL6 0AT is in council tax band G. That sits towards the upper end of the band ladder, typically reflecting larger or higher-value homes.

Where is 40 Harmer Green Lane, AL6 0AT located?

40 Harmer Green Lane, AL6 0AT sits in Welwyn. It falls within the AL6 postcode district in Hertfordshire.

Is 40 Harmer Green Lane, AL6 0AT in a safe area?

Police records around 40 Harmer Green Lane, AL6 0AT show an average of 2 reported crimes per month over the last 8 months. Violent crime makes up roughly 67% of reports, the most common category. The overall trend is broadly stable. Source: Police UK.

Which schools serve 40 Harmer Green Lane, AL6 0AT?

The closest primary school to 40 Harmer Green Lane, AL6 0AT is St John's CofE Primary School (768m), one of 12 primaries within walking distance. The closest secondary is Monk's Walk School (1.6km), with 2 secondaries in the surrounding area.

What transport links are near 40 Harmer Green Lane, AL6 0AT?

The closest bus stop to 40 Harmer Green Lane, AL6 0AT is Welwyn North Railway Station, 214m away. The nearest rail option is Welwyn North Rail Station, 224m away.

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40 Harmer Green Lane, Welwyn, AL6 0AT

Swimming pool5 sales on record7 planning records

Property type

Detached

Bedrooms

Bathrooms

Floor area

385 m²

4144 sq ft

Energy rating

Score 72

Council tax

Band G

Tenure

Owner Occupied

Overview

About 40 Harmer Green Lane

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

40 Harmer Green Lane is a five-bedroom detached house in Welwyn (AL6 0AT). It has a recorded floor area of 385 m² (around 4144 sq ft), construction records dating it to 1930-1949 and council tax band G. There is a swimming pool on the plot, uncommon for the area. Other recorded features include outbuildings. The latest certificate (March 2018) shows a C (score 72). When first surveyed in April 2010 the rating was D, the property has climbed 1 band since. Between certificates, lighting went from Very Poor to Average; while roof efficiency dropped from Good to Average and hot-water efficiency dropped from Very Good to Good.

At 385 m² the property is well over the postcode median (241 m² across 8 EPCs), placing it in the larger end of the local stock. Most recent transfer: December 2021 at £1,726,000. Across the public record there are 5 sales, relatively high churn for a single property. That sale was during the post-pandemic price surge, when transactions cleared materially above pre-2020 trend. 7 planning records sit against the property, 5 approved, 2 refused. Past consents include an extension, meaningful when judging how the property has evolved. Across 1997–2021, sale prices on this property compounded at 6.1% per year. Today's modelled estimate of £2,188,000 is 26.8% above the 2021 sale price.

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Larger development activity nearby

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Valuation

against the asking price

Risks

planning & flood

Sold prices

similar homes nearby

Trends

the local market

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

Bedrooms5
Bathrooms4
Dining roomYes
Utility roomYes
CloakroomYes

Outside

Private gardenRear
GarageDouble
OutbuildingsYes
Swimming poolYes

Energy

Energy performance

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

40 Harmer Green Lane's carbon output runs well above what efficient homes in the postcode produce.

Current Certificate(1 of 2)

Mar 2018

EPC Rating

C72

Main Heating

Gas

Main Fuel

Gas

Hot Water

Good

Windows

Average

CO2 Emissions

9.3 t/year

Occupancy

Owner Occupied

Property Improvements

Changes detected from historical EPC data

Mar 2018from Apr 2010

EPC improved fromD57toC72

Hot Water

Very GoodGood

Hot water efficiency decreased

Low Energy Lighting

0%35%

More low energy lighting installed

Planning

Planning history

Applications and permits filed against 40 Harmer Green Lane, Welwyn, AL6 0AT, sourced from the PlanIt planning register.

40 Harmer Green Lane has been extended on multiple sides of the property across separate planning applications.

Mar 2022
ExtensionFull
In report
Extension: Single storey · Side of property
Erection of a single storey side/front infill extension
Reference
6/2022/0160/HOUSE
View planning record
Dec 2021
ExtensionFull
In report
Extension: Single storey · Side and rear of property
Erection of a first floor side/rear extension
Reference
6/2021/3028/HOUSE
View planning record

Before you offer

We flagged 1 thing worth checking at 40 Harmer Green Lane

Independent checks surfaced things a buyer would want to understand before offering. The report explains each one in full, with the underlying data and what to ask.

Larger development activity nearby

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Price

Sales history & valuation

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

40 Harmer Green Lane has more than quadrupled in price since its earliest registered sale in 1997.

Current estimate

£2,188,000

Modelled from EPC, postcode comparables and a sale-price growth of 6.1% per year over 24 years.

See how we calculated this

Last sold (2021)

£1,726,000

Growth on file: 6.1% per year over 24 years.

Sales timeline

3 December 2021Most recent
£1,726,000
+39.2%over 11 years
29 July 2010
£1,240,000
+30.5%over 6 years
29 April 2004
£950,000
+50.2%over 2 years
29 April 2002
£632,500
+53.3%over 4 years
6 August 1997
£412,500

Median price across the last 5 sales in AL6 0AT: £1,201,264 (2025–2015).

Nearby sales in AL6 0AT

Before you offer

Everything we know about 40 Harmer Green Lane, in one report

What it's really worth, what could be wrong, and the planning, sales and area data in full.

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Larger development activity nearby

£14.99

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On the street

Versus other Harmer Green Lane homes

Four headline reads against 8 similar houses on this street, drawn from the latest EPC and Land Registry data.

On floor area, 40 Harmer Green Lane stands well clear of the street.

Price per m²

£4,483

Street avg £5,118

Below

Floor Area

385 m²

Street avg 238 m²

Strongly above

Habitable Rooms

9 rooms

Street avg 8 rooms

Above

CO₂ Emissions

9.3 t/year

Street avg 7.5 t/year

Below

Comparables

Similar properties nearby

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

£1.2m

1 Desborough Drive, Tewin

AL6 0HQ

5 bed2 bath

£1.1m

1 Acorn Glade, Digswell

AL6 0AZ

5 bed

£1.1m

1 Broom Hill

AL6 0SF

5 bed4 bath

£550k

1 Cob Lane Close, Digswell

AL6 0DD

5 bed

£1.3m

1 Badgers Walk, Tewin

AL6 0HP

4 bed

£909k

1 Churchfield Road, Tewin

AL6 0JW

4 bed2 bath

£879k

1 Chestnut Walk

AL6 0SB

4 bed

£813k

1 Barneswood

AL6 0EU

4 bed

Area

The neighbourhood at a glance

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

Full Welwyn report

Rail-style transport is unusually close for this postcode.

Crime

2/mo

Steady year-on-year across the wider district.

Nearest stop

0.2 km

Welwyn North Railway Station — bus stop.

Closest school

0.8 km

St John's CofE Primary School. 14 schools nearby.

Go deeper on the local area

The full 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 40 Harmer Green Lane, Welwyn, AL6 0AT. Each answer is also embedded as structured data for search engines.