SG3 postcode: council tax bands, what homes pay and house prices in Knebworth
The SG3 postcode district covers 3,051 homes across 206 live postcodes in Knebworth. The most common council tax band is Band D (24% of homes), which North Hertfordshire charges £2,449 for 2026/27 — the district also runs into Welwyn Hatfield and East Hertfordshire.
Council tax bands in SG3
SG3 is split between councils — North Hertfordshire (58% of postcodes), Welwyn Hatfield (24% of postcodes), East Hertfordshire (18% of postcodes) — so the charge depends on which side of the boundary an address falls. The table shows the two largest.
| Band | Homes | Share | North Hertfordshire 2026/27 | Welwyn Hatfield 2026/27 |
|---|---|---|---|---|
| Band A | 153 | 5.0% | £1,632 | £1,635 |
| Band B | 358 | 12% | £1,904 | £1,907 |
| Band C | 546 | 18% | £2,176 | £2,180 |
| Band D | 722 | 24% | £2,449 | £2,452 |
| Band E | 395 | 13% | £2,993 | £2,997 |
| Band F | 481 | 16% | £3,537 | £3,542 |
| Band G | 350 | 11% | £4,081 | £4,087 |
| Band H | 46 | 1.5% | £4,897 | £4,905 |
Weighting every band by how many homes sit in it, the typical council tax bill in SG3 is about £2,761 a year (£230 a month) at North Hertfordshire’s 2026/27 charges — Band D itself is £2,449, up 5.0% on 2025/26. Bands were set from 1 April 1991 values in England and Wales (2003 values in Wales) and only change on a revaluation or a successful challenge, so the mix below shifts slowly.
Across England and Wales 16% of homes are Band D, so SG3 is heavier than average in that band; 17% of homes here are Band A or B (43% nationally) and 42% are Band E or above (20% nationally).
These are the Valuation Office Agency’s counts for the statistical areas that make up SG3, not a look-up of your address — for the exact band of one property use the VOA band search. Charges include the adult social care precept and police, fire and parish precepts where North Hertfordshire reports them in its Band D figure; single-person and other discounts come off afterwards.
House prices in SG3
HM Land Registry recorded 98 standard sales in SG3 in the twelve months to 31 July 2026. The median price paid was £458,750; half of sales fell between £330,000 and £580,000, with the cheapest at £120,000 and the dearest at £1,620,500. That is down 2.7% on the previous twelve months (median £471,250 from 88 sales).
| Type | Sales | Median price |
|---|---|---|
| Detached | 24 | £775,000 |
| Semi-detached | 22 | £507,500 |
| Terraced | 32 | £400,000 |
| Flat / maisonette | 20 | £252,500 |
Gross yield at the SG3 median
ONS puts the average private rent in North Hertfordshire at £1,429 a month (July 2026). Against the SG3 median sale price of £458,750 that is a gross yield of 3.7% before void periods, agent fees, repairs and tax. The North Hertfordshire rent and prices page breaks rent down by bedrooms, and the rental yield calculator takes your own purchase price and rent.
How old the homes are
| Built | Homes | SG3 | England & Wales |
|---|---|---|---|
| Before 1900 | 225 | 7.5% | 15% |
| 1900–1939 | 703 | 23% | 20% |
| 1945–1972 | 869 | 29% | 26% |
| 1973–1999 | 836 | 28% | 21% |
| 2000–2008 | 90 | 3.0% | 6.3% |
| 2009 onwards | 257 | 8.5% | 12% |
31% of homes in SG3 were built before 1939, against 35% across England and Wales. Older stock usually means lower EPC ratings and higher heating bills — relevant because privately rented homes need EPC C by 1 October 2030, and North Hertfordshire’s EPC page shows how far the local stock is from that line.
If you let a home in SG3
- Empty between tenants: the landlord is liable for council tax during a void, and North Hertfordshire sets its own empty-home discount or premium — see North Hertfordshire council tax 2026/27 and council tax in void periods as a deductible expense.
- Second homes and long-term empties: a 100% premium can apply from April 2025 — the premium tracker lists each council’s decision.
- HMOs: since 1 December 2023 a licensed HMO is banded as one dwelling in England, with the landlord liable — check licensing rules by council.
- Buying to let here: run the second-home stamp duty and buy-to-let stress test at the SG3 median, then the rental income tax calculator.
Other SG postcodes
SG1 · SG2 · SG4 · SG5 · SG6 · SG7 · SG8 · SG9 · SG10 · SG11 · SG12 · SG13 · SG14 · SG15 · SG16 · SG17 · all SG districts
Sources
Open data this page is built from; figures are recomputed each time the site is rebuilt.
- Valuation Office Agency — Council Tax: stock of properties, 2025 — table CTSOP4.1, dwellings by band and build period at 31 March 2025, weighted from statistical areas into postcode districts
- HM Land Registry — Price Paid Data — standard sales registered to 31 July 2026. Contains HM Land Registry data © Crown copyright and database right 2026, licensed under the Open Government Licence v3.0
- ONS — Postcode Directory, August 2026 — live postcodes, statistical areas and local authorities. Contains OS data © Crown copyright and database right 2026; Royal Mail data © Royal Mail copyright and database right 2026
- Council tax charges 2026/27 — MHCLG and Welsh Government council tax levels, as used on this site’s council pages
- VOA — check your council tax band — the official per-address lookup
Asked about this postcode
Band D — 24% of the 3,051 homes the VOA lists in SG3. Bands A–D together cover 58% of homes here.
Band D in North Hertfordshire is £2,449 a year; Band D, the most common band in SG3, is £2,449. Weighted across every band the typical bill is about £2,761.
North Hertfordshire — 58% of live postcodes in SG3 fall in that authority. The rest are in Welwyn Hatfield and East Hertfordshire.
The median price paid in the twelve months to 31 July 2026 was £458,750 across 98 standard sales registered with HM Land Registry; a quarter of sales were below £330,000 and a quarter above £580,000.
Use the Valuation Office Agency’s free search (linked above) — it returns the band for any address in England and Wales. If you think the band is wrong you can ask the VOA to review it; a successful challenge is backdated.