159 Park Lane Old Knebworth Knebworth Hertfordshire SG3 6PR Data via plota.co.uk

26/02149/FPH - Full Permission Householder Approved
Extensions & alterations

Proposal

Single storey rear and front extensions following demolition of existing rear element. Data via plota.co.uk

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View original council record ↗Last checked

Application progress

✓
Received
10 Sept 2026
✓
Approved
16 Oct 2026

Approved on 16 Oct 2026 · Delegated · Last checked 20 Oct 2026

Documents

View the documents on the council's website ↗

Site constraints 4

Green belt: London
Inappropriate development needs very special circumstances.
Green belt policy allows a short list of exceptions, such as limited extensions and replacement buildings. Anything else needs very special circumstances that clearly outweigh the harm. Some green belt land can count as grey belt, where it does not strongly serve the green belt's purposes. The council decides this in its green belt assessment or on each application, so we do not mark it here.
Read the government guidance ↗
Agricultural land, grade 3a
Best and most versatile land (grades 1, 2 and 3a). Source: the Predictive Agricultural Land Classification Map (Defra and Natural England, 2025; the Welsh Government's Predictive ALC Map 2 in Wales), a model rather than a site survey. Natural England's Provisional ALC map (1:250,000, 1970s) agrees.
Where development of farmland is needed, policy prefers poorer land over the best and most versatile (grades 1, 2 and 3a). Three sources: Natural England's post-1988 field surveys, which are definitive where they exist; the Defra predictive map for England (2025) and the Welsh Government predictive map, modelled from the soil map with 3a and 3b split; and the 1970s provisional map, which planners and other services still show, coarser and with grade 3 undivided. Where the provisional and predicted grades disagree, treat the predicted grade as the current estimate and expect an application to carry its own survey.
Habitat network: Network Enhancement Zone 2
Where habitat is joined up enough to work as a network. Context, not a constraint on its own.
Also on the record
Radon affected area, class 2.
Not affected
Outside flood zones 2 and 3 · No listed building at the site · No scheduled monument at the site

Checked on 6 October 2026. Historic England, the Environment Agency, Natural England, the British Geological Survey and UK Health Security Agency (radon, contains BGS materials © UKRI) and council datasets, Open Government Licence. A boundary can run through a site and the council holds the definitive record: confirm with the council before relying on this.

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Important details

Council
North Hertfordshire
Application type
Full Permission Householder
Postcode
SG3 6PR
Received
10 Sept 2026
Validated
10 Sept 2026
Ward
Knebworth Ward
Parish
Knebworth Parish Council
Case officer
Show
Target decision
5 Nov 2026
Decision
Conditional Permission
Decision date
16 Oct 2026
Decision level
Delegated
Applicant
Show
Agent
Show

How this decision compares

Decided in 36 days from validation, 13 days faster than North Hertfordshire's median of 49 for extensions. Approved, as 92% of extensions here are.

79%decided within 8 weeks
92%approved
601decided in the last year

Plota live figures for extensions decided by North Hertfordshire in the last twelve months, from validation. North Hertfordshire decision record →

Public comments

No public comments yet.

2 neighbours consulted · Last counted 20 Oct 2026

Read the comments on the council site ↗

Consultation & key dates

Alt. reference
PP-15186822
Planning Portal ref
PP-15186822
Comments by
10 Oct 2026

Historical activity at this location

13 nearby applications on record - archival context, not part of the live application.

Within ~100m

Nearby activity

2023 Approved
182 Park Lane Old Knebworth Knebworth Hertfordshire SG3 6PR
Single storey rear extension with the following dimension: Length as measured from rear w…
23/02612/NCS
2023 Approved
182 Park Lane Old Knebworth Knebworth Hertfordshire SG3 6PR
Single storey rear extension with the following dimension: Length as measured from rear w…
23/02612/NCS
2022 Approved
195 Park Lane Old Knebworth Knebworth Hertfordshire SG3 6PR
Part single storey part two storey rear extension. Ground floor side door.
22/03197/FPH
2022 Approved
195 Park Lane Old Knebworth Knebworth Hertfordshire SG3 6PR
Part single storey part two storey rear extension. Ground floor side door.
22/03197/FPH
2021 Approved
207 Park Lane Old Knebworth Knebworth Hertfordshire SG3 6PR
Hipped roof to a gabled roof and insertion of dormer to existing rear elevation roofslope
21/01307/LDCP
2021 Approved
207 Park Lane Old Knebworth Knebworth Hertfordshire SG3 6PR
Hipped roof to a gabled roof and insertion of dormer to existing rear elevation roofslope
21/01307/LDCP
2021 Approved
205 Park Lane Old Knebworth Knebworth Hertfordshire SG3 6PR
Single storey rear extension following demolition of existing rear extension
21/00840/FPH
2021 Approved
205 Park Lane Old Knebworth Knebworth Hertfordshire SG3 6PR
Single storey rear extension following demolition of existing rear extension
21/00840/FPH
2017 Approved
176 Park Lane Old Knebworth Knebworth SG3 6PR
Single storey rear extension.
17/01594/1PUD
2016 Approved
189 Park Lane Old Knebworth Knebworth SG3 6PR
New vehicular crossover. As amended by drawing 502/02A received 26 April 2016.
16/00767/1HH
2016 Approved
189 Park Lane Old Knebworth Knebworth SG3 6PR
New vehicular crossover. As amended by drawing 502/02A received 26 April 2016.
16/00767/1HH
2016 Approved
160 Park Lane Old Knebworth Knebworth SG3 6PR
Widening and replacement of existing vehicle crossover.
16/00374/1HH
2016 Approved
160 Park Lane Old Knebworth Knebworth SG3 6PR
Widening and replacement of existing vehicle crossover.
16/00374/1HH
North Hertfordshire
Planning Authority Score
6.9/10
Good
#66 of 296 councils
Relevant to this application:
Householder decisions

North Hertfordshire ranks #128 out of 296 councils for householder decision speed. Householder applications are slightly more likely to be approved here (95%) than the national average (90%).

These figures are council-wide context, not a prediction for this application. View full council performance
North Hertfordshire decision statistics
Based on MHCLG data, the year to March 2026
93%
Overall approval rate
Above avg (87%) #62 of 296
95%
Householder approved
Above avg (90%) #87 of 296
69%
Decided in 8 weeks
Above avg (63%) #128 of 296
32%
Extended time limit
Below avg (41%) #65 of 296
82%
Minor dwellings approved
112 decided (1-9 homes)
84%
Major dwellings approved
19 decided (10+ homes)
90%
Change of use approved
21 decided
1,102
Total decisions
82 refused in the year to March 2026
Source: MHCLG planning statistics · See full council rankings

Freehold boundary: © Crown copyright and database rights 2026, HM Land Registry. Polygons © Crown copyright and database rights 2026 Ordnance Survey 100026316. Conditions of use