Larch House Old Knebworth Lane Knebworth Hertfordshire SG3 6FS Data via plota.co.uk

26/00817/FPH - Full Permission Householder Approved
Extensions & alterations

Proposal

Insertion of front bay window following removal of existing garage doors to facilitate garage conversion into habitable accommodation. Front entrance porch and installation of side canopy. Insertion of rooflights to existing rear element roofslope. Alterations to fenestration. Erection of boundary wall/railings and installation of entrance gates. Data via plota.co.uk

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View original council record ↗Last checked

Application progress

✓
Received
27 Mar 2026
✓
Approved
3 Jun 2026

Approved on 3 Jun 2026 · Delegated · Last checked 1 Aug 2026

Documents

View the documents on the council's website ↗

Associated applications 2

Site constraints 6

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 ↗
Old Knebworth conservation area
Demolition needs planning permission and permitted development is restricted.
The council must give weight to preserving or enhancing the area's character and appearance. Not every council has published its boundaries as open data.
Council document ↗
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.
Registered park or garden 93 m away: Knebworth
Its setting is a consideration for work nearby.
Registered parks and gardens, battlefields, world heritage sites and protected wrecks are designated heritage assets: harm needs clear and convincing justification.
Historic England ↗
Also on the record
2 listed buildings within 150 m; Radon affected area, class 2.
Not affected
Outside flood zones 2 and 3 · 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.

Building

Floor area299 m² (3,218 sq ft)
Energy ratingD (65 out of 100), could reach C
PropertyDetached house, 10 habitable rooms
BuiltBefore 1900
HeatingBoiler and radiators, mains gas
WallsCavity wall, as built, no insulation (assumed)

From the energy performance certificate lodged in January 2025, the latest held for this property. The building may have changed since. View the certificate

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Important details

Council
North Hertfordshire
Application type
Full Permission Householder
Postcode
SG3 6FS
Received
27 Mar 2026
Validated
27 Mar 2026
Ward
Knebworth Ward
Parish
Knebworth Parish Council
Case officer
Show
Target decision
5 Jun 2026
Decision
Conditional Permission
Decision date
3 Jun 2026
Decision level
Delegated
Applicant
Show
Agent
Show

How this decision compares

Decided in 68 days from validation, 19 days slower 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.

Last counted 1 Aug 2026

Read the comments on the council site ↗

Consultation & key dates

Alt. reference
PP-14814865
Planning Portal ref
PP-14814865
Comments by
23 May 2026

Historical activity at this location

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

Within ~100m

Nearby activity

2025 Approved
Larch Howe Park Lane Old Knebworth Knebworth Hertfordshire SG3 6PS
T1 Weeping Willow - Repollard to previous pollarding points, approx. 8m and remove deadwo…
25/02545/TCA
2025 Approved
Larch Howe Park Lane Old Knebworth Knebworth Hertfordshire SG3 6PS
T1 Weeping Willow - Repollard to previous pollarding points, approx. 8m and remove deadwo…
25/02545/TCA
2024 Refused
Old School House Park Lane Old Knebworth Hertfordshire SG3 6PR
Erection of five single storey terraced dwellings with associated landscaping, boundary f…
24/02652/FP
2023 Approved
Larch Howe Park Lane Old Knebworth Knebworth Hertfordshire SG3 6PS
3x Lime - Reduce the main trunk of to 4m to bring them into line.
23/02552/TCA
2023 Approved
Larch Howe Park Lane Old Knebworth Knebworth Hertfordshire SG3 6PS
3x Lime - Reduce the main trunk of to 4m to bring them into line.
23/02552/TCA
2023 Approved
Larch Howe Park Lane Old Knebworth Knebworth Hertfordshire SG3 6PS
3 x Lime - Re-pollard
23/01581/TCA
2023 Approved
Larch Howe Park Lane Old Knebworth Knebworth Hertfordshire SG3 6PS
3 x Lime - Re-pollard
23/01581/TCA
2019 Approved
Little Hyde Park Lane Old Knebworth Knebworth Hertfordshire SG3 6PR
12x Leylandii - Fell
19/00230/TCA
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

Energy performance: Energy performance certificates from the Energy Performance of Buildings Register, Ministry of Housing, Communities and Local Government. Contains public sector information licensed under the Open Government Licence v3.0. © Crown copyright 2026.