12a is a two-bedroom detached house in St Albans (AL1 1BZ). It has a recorded floor area of 65 m² (around 700 sq ft), construction records dating it to before 1900 and council tax band C. The latest certificate (January 2026) shows a D (score 65), on the cusp of jumping into the C band. When first surveyed in July 2010 the rating was E, the property has climbed 1 band since. Between certificates, wall efficiency went from Very Poor to Good and lighting went from Average to Good; while window efficiency dropped from Poor to Very Poor and hot-water efficiency dropped from Good to Average. The recommended improvements would push it to C (score 80). Main heating runs on electricity. This certificate was lodged in the last six months, so the rating reflects current condition. At 65 m² this is the 14th smallest of 25 units on EPC record in the building, where floor areas span 25–161 m². The building's EPC ratings span F to C across 25 units on file.
At 65 m² it's 20.4% larger than the typical home in the postcode (54 m² median across 24 EPCs). Today's modelled estimate of £433,000 is 25.5% above the 2015 sale price. On a £-per-square-foot basis, the last sale (£493/sq ft) was about 19.4% above the typical sold price in the postcode. Last sold in May 2015, so it's been off the market for around 11 years.
12a's carbon output is low for the local stock.
No planning applications are recorded against 12a, Holywell Hill, St Albans, AL1 1BZ. The full report also covers planning activity across the surrounding area.
Full planning data for 12a, Holywell Hill, St Albans, AL1 1BZ
Every application and decision on this property and nearby, in full, in the report.
12a valuation sits well clear of the typical sold price in this postcode.
£433,000
Modelled from EPC, postcode comparables.
£345,000
Recorded with HM Land Registry.
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12a outperforms the street on co₂ emissions by a wide margin.
Price per m²
£5,308
Street avg £6,993
Floor Area
65 m²
Street avg 54 m²
Habitable Rooms
3 rooms
Street avg 3 rooms
Rail-style transport is unusually close for this postcode.
Crime
5/mo
Steady year-on-year across the wider district.
Nearest stop
0.1 km
The Peahen PH — bus stop.
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Changes detected from historical EPC data
Heating system changed
Changed to a more efficient fuel source
Heating controls changed
Hot water system changed
Window efficiency improved
Wall insulation improved
Upgraded to gas central heating
Heating controls upgraded for better temperature management
Hot water system upgraded
Wall insulation upgraded
Connected to mains gas supply
Hot water efficiency improved
Single glazing replaced with double or better glazing
Heating system changed
Changed to a more efficient fuel source
Heating controls changed
Hot water system changed
External or internal wall insulation added
29 May 2015Most recent
£345,000
Median price across the last 5 sales in AL1 1BZ: £368,000 (2020–2016).
Detailed EPC data
Full energy ratings, history and recommendations
Full planning history
Every application and decision on record
Comparable sales data
Plus transport, crime, schools and air quality
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CO₂ Emissions
0.8 t/year
Street avg 3.2 t/year
AL1 1DQ
Closest school
0.3 km
The Abbey Church of England Voluntary Aided Primary School, St Albans. 30 schools nearby.