20a is a detached house in Great Horwood, Milton Keynes, Milton Keynes (MK17 0QW). It has a recorded floor area of 149 m² (around 1604 sq ft), construction records dating it to 1976-1982 and council tax band F. The latest certificate (February 2025) returns a high B (score 87), putting the home a stone's throw from an A rating. When first surveyed in March 2024 the rating was E, the property has climbed 3 bands since. Between certificates, hot-water efficiency went from Very Poor to Poor and main heating went from Average to Very Good. The recommended improvements would push it to A (score 92). Main heating runs on electricity.
On energy efficiency it sits in the top 10% of properties in this postcode. Today's modelled estimate of £635,000 sits 5191.7% above the 2022 sale of £12,000. On a £-per-square-foot basis, the last sale (£7/sq ft) was about 97.2% below the postcode norm. 2 planning records sit against the property, 0 approved, 0 refused. Last sale on file: £12,000 in January 2022. That sale was during the post-pandemic price surge, when transactions cleared materially above pre-2020 trend.
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20a ranks among the most efficient homes in the postcode for energy use.
Planning history at 20a is exclusively tree-management applications — typical for a property with mature trees on or near the plot.
Latest sale on 20a was the lowest on Land Registry record across the postcode.
£635,000
Modelled from EPC, postcode comparables.
£12,000
Recorded with HM Land Registry.
What it's really worth, what could be wrong, and the planning, sales and area data in full.
20a is notably below the street on price per m².
Price per m²
£81
Street avg £3,379
Floor Area
149 m²
Street avg 161 m²
Habitable Rooms
6 rooms
Street avg 7 rooms
Daytime road noise here sits well below conversation level — a quiet pocket of the postcode.
Crime
5/mo
Steady year-on-year across the wider district.
Nearest stop
0.1 km

Daytime· 07:00 – 23:00
45.8dB

Valuation
against the asking price
Risks
planning & flood
Sold prices
similar homes nearby
Trends
the local market
Changes detected from historical EPC data
Heat pump installed, significantly improving energy efficiency
Heating controls upgraded for better temperature management
Hot water system upgraded
Solar PV panels (45 kWp) installed
T8 Horse Chestnut, to be pollarded down to 3m-5m from ground level remaining, to be finally decided when arborist is working, T11 Walnut, recommended to remove this tree due to squirrel damage. We would reduce it to fence level 1200mm high and carve a seat into the stump, image 1841T12 Rowan, recommended to remove the main dying trunk, allowing new growth to develop from the base, Image 1842.
This initial proposal is to cut back the canopies of the 3-4 Horse chestnuts shown, perhaps pollarding down to3m as they are interlocking and causing damage to each other. This would allow light in to ground level and generate healthy growth for added biodiversity whilst we plan the next best action for the fully biodiverse area of 50mx15m. The full area is a small wooded area comprising a mixture of woodland trees, mostly non native, planted around 25 years ago, but never thinned to optimise biodiversity. We would like to introduce native species over the next few years replacing some of the current trees. On the 5 yr management sketch attached, trees t1-t9 could be felled to make a more aesthetic and amenity friendly area. A hedgerow along one short edge is proposed comprising blackthorn and a mix of appropriate whips as well as a field maple and other native species to create a great and balanced wildlife habitat. Also a pond is shown and proposed. Overall some enhancements are planned without harming the existing feel of the wooded area to provide a biodiverse environment to enjoy.
What's in 20a, Spring Lane, Great Horwood, Milton Keynes, MK17 0QW's planning history?
Refusals, disputes and full decisions on this property and nearby, in the report.
6 January 2022Most recent
£12,000
Median price across the last 5 sales in MK17 0QW: £630,000 (2025–2022).
16 Spring Lane Great Horwood Milton Keynes
Sold Sept 2025
Wigwell Spring Lane Great Horwood Milton Keynes
Sold Jun 2025
8 Spring Lane Great Horwood Milton Keynes
Sold May 2024
30 Spring Lane Great Horwood Milton Keynes
Sold Mar 2024
2 Spring Lane Great Horwood Milton Keynes
Sold Aug 2022

CO₂ Emissions
1.4 t/year
Street avg 7.3 t/year
Spring Lane — bus stop.
Closest school
0.4 km
Great Horwood Church of England School. 3 schools nearby.
Go deeper on the local area
The full report breaks down crime, transport links, schools and air quality in depth.
Night-time· 23:00 – 07:00
38.3dB