SG3 house prices and areas
SG3 covers Knebworth in London (Hertfordshire). Here is what homes actually sold for: every standard sale HM Land Registry recorded from January 2025 to September 2026.
Prices by property type
Medians are shown where there were at least 10 sales of that type.
43 sales
72 sales
57 sales
40 sales
Sales by year
| Year | Sales | Median |
|---|---|---|
| 2025 | 146 | £470,000 |
| 2026 (so far) | 66 | £467,500 |
A part-year and a small mix shift (say, more flats sold this year) can move a median without any change in what homes are worth, so treat year-to-year differences with care.
New builds and leasehold
16.5% of SG3 sales were new builds and 20.8% were leasehold. Most sales here were freehold, which usually means houses.
Areas in SG3
Nearby postcodes
Questions about SG3
What is the average house price in SG3?
The median sale price in SG3 was £470,000 across 212 recorded sales from January 2025 to September 2026 (HM Land Registry). Half of sales were between £347,000 and £600,000.
Which areas are in the SG3 postcode?
Boroughly's area guides in SG3 cover Knebworth. Postcode districts don't follow neighbourhood names exactly, so a street can sit in SG3 but feel part of a neighbouring area.
What type of property sells most in SG3?
Semi-detached homes were the most common sale (72 of 212). Flats had the lowest median, at £247,500. 20.8% of sales were leasehold and 16.5% were new builds.