Planning application
Larch House Old Knebworth Lane Knebworth Hertfordshire SG3 6FS
Works: Loft or dormer Windows or glazing
Relates to 26/00817/FPH
Still open. Anyone can comment while the consultation period runs, and comments go to the council rather than to us.
Proposal
External wall insulation and timber boarding added to east wall. Front door design updated, bi-fold doors changed to 6 doors and addiotnal rooflight added to landing outside bedroom 6 (as Non-Material Amendment to Planning Permission 26/00817/FPH granted 03.06.2026)
As published by the council, reference 26/02210/NMA
Application record
- Reference
- 26/02210/NMA
- Category
- Amendments
- Status
- Registered
- Received
- 2 Sep 2026
- Validated
- 2 Sep 2026
- Postcode
- SG3 6FS
Site history
Applications at this address on the North Hertfordshire register
This site has had 4 applications since 2026: 2 approved, 0 refused.
-
26/02332/TCA Awaiting decision
Larch House Old Knebworth Lane Knebworth Hertfordshire SG3 6FS
R1: Robinia - Remove.
-
26/00817/FPH Granted
Larch House Old Knebworth Lane Knebworth Hertfordshire SG3 6FS
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.
-
26/00424/FPH Granted
Larch House Old Knebworth Lane Knebworth Hertfordshire SG3 6FS
Erection of four bay cartlodge with habitable accommodation at first floor and external staircase following demolition of existing stables and store.
Timeline
Dates from the published record
-
2 Sep 2026
Received by North Hertfordshire
-
10 Sep 2026
Added to PlanIndex
-
Decision
Awaiting decision
Decision expected by 28 October 2026, 8 weeks from validation under the statutory target for most applications. Extensions of time are common and are agreed case by case.
North Hertfordshire took a median of 48 days over the applications it decided in the last year.
Related applications
Cases linked to this one on the register
-
26/00817/FPH Granted
Larch House Old Knebworth Lane Knebworth Hertfordshire SG3 6FS
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.
What happens while it is decided
This application is with North Hertfordshire for determination, against a statutory target of eight weeks. Over the last year North Hertfordshire decided amendment applications in a median of 28 days. More in our guide to how long planning decisions take.
About amendment applications
An amendment application makes limited changes to a permission that already exists; anything beyond modest adjustment needs a fresh application. More in our guide to planning application types.
Nearby applications
Within 500 metres
-
Larch House Old Knebworth Lane Knebworth Hertfordshire SG3 6FS
99% historically approved · decision due ~11 Nov
R1: Robinia - Remove.
Awaiting decision Trees -
Larch House Old Knebworth Lane Knebworth Hertfordshire SG3 6FS
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.
Granted Householder Extension Loft or dormer +1 12 docsSmall domestic -
Larch House Old Knebworth Lane Knebworth Hertfordshire SG3 6FS
Erection of four bay cartlodge with habitable accommodation at first floor and external staircase following demolition of existing stables and store.
Granted Householder Demolition 11 docsDomestic -
190 Park Lane Old Knebworth Knebworth Hertfordshire SG3 6PS
Single storey rear extension to facilitate 1-bed annexe accommodation following demolition of existing outbuilding
Refused Householder Extension Demolition 10 docsSmall domestic -
190 Park Lane Old Knebworth Knebworth Hertfordshire SG3 6PS
Single storey rear extension to facilitate 1-bed annexe accommodation following demolition of existing outbuilding
Refused Heritage and listed buildings Extension Demolition 11 docsSmall domestic -
207 Park Lane Old Knebworth Knebworth Hertfordshire SG3 6PR
Hipped roof to a gabled roof and insertion of dormer to existing rear elevation roofslope
Granted Lawful development Loft or dormer 5 docs
Other amendment applications
In North Hertfordshire
-
26/01705/NMA Decided
Irongate Barn Halls Green Weston Hitchin Hertfordshire SG4 7DR
Installation of canopy and brise soleil to the south elevation of the existing concrete barn with additional glazing to the north elevation and relocation of the approved rooflights and an increase in their number from two to four (as Non-Material Amendment to planning permission 25/01141/FP granted 11.12.2025)
-
26/02255/NMA Awaiting decision
Highover Farm Highover Way Hitchin Hertfordshire SG4 0RQ
Revisions to approved plans relating to (i) northern loop road raised table location, (ii) revised details for sub-station, (iii) minor alteration to location of pumping station and associated landscaping (as Non-Material Amendment of planing permission 25/02794/RM granted 06.05.2026)
-
26/02258/NMA Awaiting decision
Land On The North Side Of Pirton Road Holwell Hertfordshire SG5 3SN
Omission of the decorative chimney stacks and brick soldier course detailing shown on the approved elevations to Plots 3, 4, 5 and 6 (as Non-Material Amendment of planning permission 24/01620/S73 granted 03.09.2024)
-
26/02230/NMA Awaiting decision
The Elms The Causeway Therfield Royston Hertfordshire SG8 9PP
Installation of metal windows (as Non-Material Amendment to planning permission 24/00802/FPH granted 17.09.2024)
-
26/01846/NMA Decided
Highover Farm Highover Way Hitchin Hertfordshire SG4 0RQ
Revision to the wording of condition 2 to include the location and specification to be submitted for the pumping station and condition 3 to include details of the carriageway surface and construction including footpaths (excluding the main road) as Non-Material Amendment to planning permission 24/02780/RM granted 27.10.2025.