44 Harmer Green Lane, Welwyn, AL6 0AT
About 44 Harmer Green Lane
44 Harmer Green Lane is a four-bedroom detached house in Welwyn (AL6 0AT). It has a recorded floor area of 238 m² (around 2562 sq ft), construction records dating it to 1900-1929 and council tax band G. The latest certificate (October 2024) returns a high B (score 85), putting the home a stone's throw from an A rating. When first surveyed in September 2010 the rating was F, the property has climbed 4 bands since. Between certificates, window efficiency went from Very Poor to Poor, hot-water efficiency went from Average to Good and lighting went from Very Poor to Very Good. The recommended improvements would push it to A (score 95).
Held since March 2011 — that's 15 years off the open market, well above the local norm. On energy efficiency it sits in the top 10% of properties in this postcode. Across 2004–2011, sale prices on this property compounded at 2.8% per year. Today's modelled estimate of £1,335,000 sits 58% above the 2011 sale of £845,000. 4 planning records sit against the property, 2 approved, 2 refused. Past consents include an extension, meaningful when judging how the property has evolved.
Know exactly what you're buying at 44 Harmer Green Lane
Before you offer, see what the listing won't tell you, the true value, the red flags and the full history.
Already flagged here
Valuation
against the asking price
Risks
planning & flood
Sold prices
similar homes nearby
Trends
the local market
What this property has
Inside
- Bedrooms4
Energy performance
44 Harmer Green Lane ranks among the most efficient homes in the postcode for energy use.
EPC Rating
Property Improvements
Changes detected from historical EPC data
Hot water system upgraded
Single glazing replaced with double or better glazing
More low energy lighting installed
Solar PV panels (50 kWp) installed
Planning history
- Nov 2011AmendmentIn report
Non material amendment following approval of planning permission N6/2011/0847/FP - Change in roof design for front elevation now a dummy pitch with roof taken across garage forming a crown roof over
- Documents
- 2 docs on file
- Reference
- N6/2011/2325/NM
- Jul 2011ExtensionFullIn report
Extension: Single storey · Side and rear of property
Erection of single storey rear and side extension with replacement garage
- Documents
- 6 docs on file
- Reference
- N6/2011/0847/FP
We flagged 1 thing worth checking at 44 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
30-day money-back guarantee
Sales history & valuation
44 Harmer Green Lane valuation sits well clear of the typical sold price in this postcode.
£1,335,000
Modelled from EPC, postcode comparables and a sale-price growth of 2.8% per year over 7 years.
£845,000
Growth on file: 2.8% per year over 7 years.
Sales timeline
23 March 2011Most recent
£845,000
+20.7%over 6 years29 June 2004
£700,000
Median price across the last 5 sales in AL6 0AT: £1,726,000 (2025–2018).
Nearby sales in AL6 0AT
26 Harmer Green Lane, Welwyn, AL6 0AT
Sold Aug 2025
£720,00038 Harmer Green Lane, Welwyn, AL6 0AT
Sold Mar 2022
£1,775,00044a, Harmer Green Lane, Welwyn, AL6 0AT
Sold Dec 2021
£960,00040 Harmer Green Lane, Welwyn, AL6 0AT
Sold Dec 2021
£1,726,00048a, Harmer Green Lane, Welwyn, AL6 0AT
Sold Oct 2018
£1,885,000
Everything we know about 44 Harmer Green Lane, in one report
What it's really worth, what could be wrong, and the planning, sales and area data in full.
What we flagged
- Larger development activity nearby

Versus other Harmer Green Lane homes
On price per m², 44 Harmer Green Lane runs well behind the street norm.
Price per m²
£3,550
Street avg £5,251
Floor Area
238 m²
Street avg 256 m²
Habitable Rooms
7 rooms
Street avg 8 rooms
CO₂ Emissions
3.8 t/year
Street avg 8.2 t/year
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The neighbourhood at a glance
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.