11a, Guessens Road, Welwyn Garden City, AL8 6QW
About 11a
11a is a four-bedroom detached house in Welwyn Garden City (AL8 6QW). It has a recorded floor area of 163 m² (around 1755 sq ft), construction records dating it to 1930-1949 and council tax band G. The latest certificate (May 2017) shows a D (score 68), on the cusp of jumping into the C band. When first surveyed in November 2008 the rating was E, the property has climbed 1 band since. Between certificates, roof efficiency went from Poor to Good, hot-water efficiency went from Average to Good and lighting went from Very Poor to Very Good; while window efficiency dropped from Good to Average. The recommended improvements would push it to C (score 79).
Untraded for 31 years, with the last transfer in June 1995. Only one transfer is on record with HM Land Registry, suggesting it has stayed in the same hands for a long time. At 163 m² the property is well over the postcode median (112 m² across 3 EPCs), placing it in the larger end of the local stock. Today's modelled estimate of £1,064,000 sits 383.6% above the 1995 sale of £220,000. On a £-per-square-foot basis, the last sale (£125/sq ft) was about 75.8% below the postcode norm. 7 planning records sit against the property, 5 approved, 2 refused. Past consents include an extension, an annexe and new windows, meaningful when judging how the property has evolved.
Know exactly what you're buying at 11a
Before you offer, see what the listing won't tell you, the true value, the red flags and the full history.
Valuation
against the asking price
Risks
planning & flood
Sold prices
similar homes nearby
Trends
the local market
What this property has
Inside
- Bedrooms4
- Dining roomYes
- EnsuiteYes
Outside
- Private gardenRear
- GarageYes
Energy performance
EPC Rating
Property Improvements
Changes detected from historical EPC data
Heating controls upgraded for better temperature management
Hot water efficiency improved
Windows upgraded, improving insulation
Roof insulation improved
More low energy lighting installed
Planning history
11a has 3 separate extension applications on the council record.
- Aug 2025AnnexFullIn report
Extension: Single storey · Rear of property
Erection of single storey rear extension, with alterations to openings on side elevation, garage conversion with extension to provide annexe accommodation to be used ancillary to the main dwelling, with alterations to openings
Extension- Reference
- 6/2025/1218/HOUSE
- Aug 2025AnnexIn report
Extension: Single storey · Rear of property
Single storey rear extension, extension and conversion of garage to an annexe
Extension- Reference
- 6/2025/1216/EM
What's in 11a, Guessens Road, Welwyn Garden City, AL8 6QW's planning history?
5 more on this property, plus refusals, disputes and full decisions nearby, in the report.
Sales history & valuation
11a's modelled value sits at over four times its earliest registered sale price (1995).
£1,064,000
Modelled from EPC, postcode comparables.
£220,000
Recorded with HM Land Registry.
Sales timeline
29 June 1995Most recent
£220,000
Median price across the last 4 sales in AL8 6QW: £665,000 (2019–1999).
Everything we know about 11a, in one report
What it's really worth, what could be wrong, and the planning, sales and area data in full.
- Am I paying too much?
- Is something wrong with it?
- Is the agent's story true?
- Will it hold its value?
Versus other Guessens Road homes
11a is notably below the street on price per m².
Price per m²
£1,350
Street avg £5,730
Floor Area
163 m²
Street avg 118 m²
Habitable Rooms
11 rooms
Street avg 6 rooms
CO₂ Emissions
5.8 t/year
Street avg 5.4 t/year
Similar properties nearby
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
0.1 km
Russellcroft Road — bus stop.
Closest school
0.7 km
Templewood Primary School. 20 schools nearby.
Go deeper on the local area
The full report breaks down crime, transport links, schools and air quality in depth.