Planning application
W Block Clare Hall Laboratories Blanche Lane South Mimms Hertfordshire
Works: Demolition
Still open. Anyone can comment while the consultation period runs, and comments go to the council rather than to us.
Proposal
Outline application (with all matters reserved except for means of access) for the demolition of buildings on site and erection of up to 185 homes (including 50% affordable housing) alongside access, landscaping, car parking and associated works.
As published by the council, reference 26/0988/OUT
Application record
- Reference
- 26/0988/OUT
- Type
- Outline Application
- Status
- Awaiting decision
- Received
- 17 Jul 2026
- Validated
- 17 Jul 2026
- Ward
- Shenley
- Parish
- The Parish Council South Mimms And Ridge
Site history
Applications at this address on the Hertsmere register
This site has had 2 applications since 2022: 1 approved, 0 refused.
-
22/0876/FUL Granted
W Block Clare Hall Laboratories Blanche Lane South Mimms Hertfordshire
Erection of two new buildings within the grounds and an extension to the W-Block for research and development use (Class E), car parking, servicing, landscaping and associated works.
Timeline
Dates from the published record
-
17 Jul 2026
Received by Hertsmere
-
1 Aug 2026
Added to PlanIndex
-
Decision
Awaiting decision
Decision expected by 11 September 2026, 8 weeks from validation under the statutory target for most applications. Extensions of time are common and are agreed case by case.
Hertsmere took a median of 56 days over the applications it decided in the last year.
Who's behind it
Company information only, from the register and Companies House
Newmark Gerald Eve LLP Agent, registered in London
Active · incorporated 2008 · London
160 applications on PlanIndex · across 17 councils · 91% granted
Trade members see everything this firm has filed, how it was decided, and get an email the day it files again.
See their track recordDocuments
Plans, drawings, consultee responses and the officer's report
105 documents on file for this application
- Llfa
- Ecology
- Herts fire and rescue service
- Llfa comments
- Built heritage response
- Hp comment
- Environmental protection comments
- Hcchp comment
- Tvw comment
- Bst comment
- National highways comments
- Environment agency comment
- Ea comments
- Lvia summary table
- Arch comment
- Forestry commission comment
- Natural england comment
- Natural england comment
- South mimms and ridge parish council
- Cllr hodgson-jones response
- Growth and infrastructure response
- Met office response
- Active travel england response
- Fire and rescue (hydrants) response
- Bng metric
- Application form redacted
- Existing site levels plan
- Existing site plan
- Existing site survey plan 6
- Land use parameter plan
- Movement network plan
- Proposed site levels plan 1
- Proposed site levels plan 2
- Site location plan
- Building heights parameter plan
- Development plots parameter plan
- Existing site survey plan 1
- Existing site survey plan 2
- Existing site survey plan 3
- Existing site survey plan 4
- Existing site survey plan 5
- Open space parameter plan
- Illustrative green and blue infrastructure plan
- Drawing schedule
- Illustrative landscape masterplan
- Site access parameter plan
- Illustrative site layout plan
- Illustrative scheme unit schedule
- Commercial letter
- Air quality assessment
- Dust assessment
- Ecological impact assessment
- Biodiversity net gain assessment
- Landscape and ecological management plan
- Landscape and visual impact assessment
- Design code part 3
- Design code part 1
- Design code part 2
- Interim travel plan
- Arboricultural impact assessment drawings
- Tree survey and arboricultural impact assessment
- Agricultural land classification report
- Statement of community involvement
- Economic statement
- Transport assessment part 2
- Transport assessment part 3
- Transport assessment part 4
- Transport assessment part 5
- Transport assessment part 6
- Transport assessment part 7
- Transport assessment part 1
- Affordable housing statement
- Built heritage statement
- Outline sustainability and energy strategy
- Utilities statement
- Phase 1 preliminary risk assessment part 2
- Phase 1 preliminary risk assessment part 3
- Phase 1 preliminary risk assessment part 1
- Design and access statement including landscape strategy part 5
- Design and access statement including landscape strategy part 1
- Design and access statement including landscape strategy part 2
- Design and access statement including landscape strategy part 3
- Design and access statement including landscape strategy part 4
- Archaeological desk based assessment
- Town planning statement
- Drainage and suds strategy part 2
- Drainage and suds strategy part 3
- Drainage and suds strategy part 4
- Drainage and suds strategy part 1
- Flood risk assessment - part 1
- Flood risk assessment - part 2
- Flood risk assessment - part 3
- Residential noise assessment
- Health impact assessment
- Applicant covering letter
- Cil form 1: cil additional information
Watch members (£5 a month) open the document list from here.
Open the documentsWhat happens while it is decided
This application is with Hertsmere for determination, against a statutory target of eight weeks. Over the last year Hertsmere decided outline applications in a median of 37 days. More in our guide to how long planning decisions take.
About outline applications
An outline application tests the principle of developing a site, holding back details such as appearance and landscaping as reserved matters for later approval. More in our guide to planning application types.
Nearby applications
Within 0.3 miles
-
W Block Clare Hall Laboratories Blanche Lane South Mimms Hertfordshire
Erection of two new buildings within the grounds and an extension to the W-Block for research and development use (Class E), car parking, servicing, landscaping and associated works.
Granted Full applications Extension 76 docs -
Clare Hall Manor Blanche Lane South Mimms Hertfordshire EN6 3LD
Internal alterations to the Modern West Wing to include removal of the north stairwell, widening of the first floor terrace and subdivision of the Modern West Wing to include layout changes to common room, to provide plant and laundry rooms. Widening of the first floor terrace at the southern end of the western wing and like for like replacement of rainwater goods. Internal alterations to the Main House to allow for the conversion of the communal kitchen to a common room (following grant of application 19/2031/LBC). (Application for Listed Building consent).
Granted Heritage and listed buildings 15 docs -
Stilegate Blanche Lane South Mimms Potters Bar EN6 3LF
Erection of two storey dwelling (with basement below) following demolition of existing dwelling (amended plans received 11/07/08)
Granted Full applications Demolition 7 docsDomestic -
N I B S C Blanche Lane South Mimms EN6 3QG
Erection of single storey laboratory building at the centre of the site (temporary permission).
Granted Full applications 7 docsSmall domestic -
Stilegate Blanche Lane South Mimms EN6 3LF
Retention of a temporary mobile home for 18 months.
Granted 5 docs -
1 Taylers Cottages Crossoaks Lane Ridge Potters Bar Hertfordshire EN6 3LL
T1 OAK. Remove 1no. limb back to main trunk (please see annotated picture)
Granted Trees 5 docs
Other outline applications
In Hertsmere
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26/1236/OUTEI Awaiting decision
Home Farm Common Lane Radlett Hertfordshire WD7 8PL
Outline planning application (with all matters reserved except access) comprising a residential development of up to 650 dwellings (Use Class C3); a one-form entry primary school and nursery; supporting mixed uses (Use Classes E and F) with associated landscaping; amenity space; drainage infrastructure and all other associated works. The application is accompanied by an Environmental Statement (EIA Development).
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26/0962/EI2 Decided
Land Known As Home Farm Common Lane Radlett Hertfordshire
Request for a scoping opinion (Environmental Impact Assessment).
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26/1112/OUT Awaiting decision
Land South Of Allum Lane Elstree Borehamwood Hertfordshire
Outline planning application (with all matters reserved except access) for the erection of residential dwellings (Class C3), new access, landscaping, parking and ancillary works.
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26/1048/OUT Awaiting decision
Land Rear Of 31 - 61 Blanche Lane South Mimms Hertfordshire
Construction of up to 49 dwellings on Land off Blanche Lane. (Outline application to include access, all other matters reserved)
-
25/1379/OUT Granted
Fields Theobald Street Radlett Hertfordshire WD7 7LS
Demolition of dwelling (Use Class C3) to provide 4x new dwellings (Use Class C3). Outline planning application (with all matters reserved except access).