Postcode district report · August 2026

SL3, Windsor and Maidenhead

SL3 is the 4th Hapiest of Windsor and Maidenhead's 5 postcode districts on the HPAI Swatch, which compares them with each other on prices, how the market is moving, energy efficiency and transport. SL3 also reaches into Slough and Buckinghamshire; these figures are for its homes in Windsor and Maidenhead.

Homes sold
42
in the 12 months to August 2026
Median price
£492,500
-12.3% on the year before
Price per m²
£4,844
median, homes with an EPC
Flats
24%
of homes sold

SL3 on the HPAI Swatch

Each tile ranks SL3 against the other postcode districts of Windsor and Maidenhead.

Price per m²£4,844/m² 4th of 5
Price change-12.3% 5th of 5
Sales a year42 a year 4th of 5
Sales change+9.6% 2nd of 5
Energy efficiency72 EPC score 1st of 5
Carbon2.9 t CO₂ a home 1st of 5
Station nearby0.2 km 1st of 5
Yellow the best in Windsor and Maidenhead Green above average Blue below average Purple weakest in Windsor and Maidenhead

Yellow is Hapi: the more yellow, the better SL3 compares with the rest of Windsor and Maidenhead. These colours compare postcode districts within Windsor and Maidenhead; Windsor and Maidenhead's own Swatch compares it with areas across England and Wales.

Windsor and Maidenhead's postcode districts, Hapiest first

#Postcode districtSwatchHomes soldMedian pricePrice change
1 SL4 396£499,975 -1.0%
2 SL6 788£508,750 -3.3%
3 SL5 189£615,000 -8.9%
4 SL3 42£492,500 -12.3%
5 TW19 38£730,000 +11.6%

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About these figures

Price per m²
Median price per square metre of homes sold in the last 12 months (homes with an EPC).
Price change
Median price in the last 12 months against the 12 months before.
Sales a year
Open-market sales in the last 12 months. More sales means a deeper, easier market.
Sales change
Sales in the 12 months to three months ago against the year before. The newest months are left out: Land Registry registers sales late.
Energy efficiency
Average EPC energy efficiency score of homes sold (higher is more efficient).
Carbon
Average carbon emissions of homes sold, tonnes a year. Lower is better.
Station nearby
Median distance from homes sold to the nearest railway station. Closer is better.

Open-market sales from HM Land Registry Price Paid Data in the 12 months to August 2026 (homes in Windsor and Maidenhead only); price per m², energy and carbon from the homes sold that have an Energy Performance Certificate. Postcode districts with fewer than 20 sales a year in Windsor and Maidenhead aren't ranked.