Consent for 18 en-suite bedrooms, lifts and links through six listed High Street houses was granted on 10 August, over the council's own conservation officer and the Town Council. The full application is still undecided.

Sevenoaks School has been granted listed building consent to reshape its Girls’ International House, the sixth-form boarding house spread across a run of Grade II and Grade II* listed houses at the southern end of the High Street, despite the district council’s own conservation officer concluding that the works would harm all six listed buildings and Sevenoaks Town Council recommending refusal. (Sevenoaks District Council, application 25/03201/LBCALT, decision notice, 10 August 2026 (PDF))

The consent, issued on 10 August under delegated powers, covers 18 new en-suite bedrooms in the conversion of Hoopers House and its workshop behind the terrace, new platform lifts, a re-routed staircase in numbers 18 to 24, new openings between the houses and their basements, new bathrooms, lowered ceilings and a glazed first-floor link between numbers 16 and 18a. The school’s separate full planning application for the same scheme, reference 25/03200/FUL, was still marked “awaiting decision” on the council’s portal this weekend. (Sevenoaks District Council, application 25/03200/FUL, summary)

Six listed houses, bought one at a time since 1977

Girls’ International House, known within the school as GIH, houses 60 sixth-form girls in numbers 14 to 24 High Street, with number 32, the unlisted Hoopers House and workshop, to be converted and extended to join it. The school’s design and access statement says the houses “have been acquired piecemeal over time since 1977, when no. 18 was purchased by the School and began being used as a boarding house”, and that the aim is “to create a unified boarding house with improved circulation, fire safety and energy efficiency”. (Sevenoaks School / Tim Ronalds Architects, Design and Access Statement, part 1, 25/03201/LBCALT (PDF))

The heritage stakes are unusual for a school application. Number 18, The Old House, is Grade II* listed and “thought to date from the early-1700s”, as is 18a behind it; numbers 16, 20, 22 and 24 are Grade II. Knole’s Grade I registered park lies just to the east. (Sevenoaks School / Tim Ronalds Architects, Planning Statement, 4 November 2025 (PDF))

The scheme was worked up through two rounds of pre-application advice, in July 2024 and March 2025, and submitted on 11 November 2025. Amended drawings, including a redesigned glazed link, were lodged on 13 July 2026. (Sevenoaks District Council, application 25/03201/LBCALT, documents)

Timeline of Sevenoaks School's Girls' International House application: pre-application advice July 2024 and March 2025; listed building consent and full planning applications submitted 11 November 2025; validated 5 January 2026; amended glazed link drawings 13 July 2026; officer report 7 August 2026; listed building consent granted 10 August 2026; full planning application 25/03200/FUL still awaiting decision
Graphic by Sevenoaks Online

What the conservation officer said

The council’s conservation officer objected to the scheme in its original form and maintained that objection after the July amendments. The officer’s earlier comments, quoted in the case officer’s report, concluded that “the proposals will cause harm to each of the six listed buildings on the site”, singling out “the proposed linking of nos.16 to 18a, insertion of the lift, linking of the buildings, loss of secondary staircase at no.18, and loss of staircase in no. 20” as the most damaging elements, and finding that “cumulatively these are considered to result in a moderate level of less than substantial harm” which “is not outweighed by the identified heritage benefits”. (Sevenoaks District Council, officer report, 25/03201/LBCALT, 10 August 2026 (PDF))

The officer set out what a supportable scheme would need: “as a minimum we would expect the removal of the link between nos. 16 and 18a and the lift in no. 18 and retention of stairs in no.20 High Street”. On the amended glazed link, the officer accepted it was “more visually permeable” but said it “would nevertheless introduce high-level movement and lightspill which would be incongruous within the historic environment”, and noted that “the other proposals where harm has been identified have not been addressed in this amended application”. (Sevenoaks District Council, officer report, 25/03201/LBCALT (PDF))

Sevenoaks Town Council had initially supported the application. After the conservation officer’s comments it changed its recommendation: the report records that the Town Council “deferred to the comments of the Conservation Officer and recommended refusal on the grounds of conservation and access concerns”, and asked that, if the scheme were approved, “consideration be given to the impact of potential construction access and nuisance, and suitable mitigation measures required”. No comments were received from the public. (Sevenoaks District Council, officer report, 25/03201/LBCALT (PDF))

Why the case officer approved it anyway

Case officer Christopher Park did not dispute the conservation officer’s findings on harm. He wrote that he had “no reason to disagree with the findings made by the Conservation Officer with regards to harm”, but that he did not “entirely agree with the works not being justified”. After a site visit he found the buildings are “served by steep staircases with narrow platforms, which makes their usability uncomfortable, especially when carrying luggage as would generally be expected within a boarding house”, and concluded there was “clear and convincing justification for the proposed lift”. (Sevenoaks District Council, officer report, 25/03201/LBCALT (PDF))

The decisive argument was safeguarding. The school’s design and access statement asserts that “staff oversight and safeguarding are severely compromised in the existing buildings”, with staff having to reach the house along a series of alleyways and through the kitchen. The officer said it was “easy to see how the existing layout could cause issues in the event of emergencies and where students require assistance from staff”, called the assessment of the internal links “finely balanced”, and found the works justified under paragraph 213 of the National Planning Policy Framework, “with the safeguarding issues outweighing the less than substantial harm”. His conclusion: “whilst the proposal does cause less than substantial harm to the significance of the listed buildings, the heritage benefits, public benefits and clear and convincing justification for the works would outweigh the identified harms.” (Sevenoaks District Council, officer report, 25/03201/LBCALT (PDF))

Because the recommendation conflicted with the Town Council’s, delegated powers had to be sought from the ward councillors. The report records that “no call to committee was made within the timeframe”, so the decision never went before the Development Management Committee. It was signed off by the case officer on 7 August and by principal officer Ashley Bidwell on 10 August. (Sevenoaks District Council, officer report, 25/03201/LBCALT (PDF))

The conditions

The consent runs for three years and carries conditions aimed at the details the conservation officer criticised. Full specifications of external materials must be approved before work starts and “shall accord with the directions given within the comments made by the Conservation Officer (zinc shall not be used on the dormers)”. Any new or replacement windows need 1:10 and 1:5 sectional drawings approved first; a detailed roof survey and schedule of repairs is required before any roof work; and the school must confirm exactly what is proposed for each historic door before upgrading them for fire safety, since the officer found the submitted door schedule “ambiguous in parts”. (Sevenoaks District Council, decision notice, 25/03201/LBCALT, 10 August 2026 (PDF))

The officer also recorded a heritage gain or two along the way: a modern spiral staircase will go, which he said “would better reveal the significance of the listed building”, an iron railing is to be removed and a historic partition reinstated.

What it means for residents

For most people the visible change will be modest. The glazed link between numbers 16 and 18a sits back from the road and, in the officer’s words, “would only be appreciable from the public realm momentarily when passing the gap between the buildings” near the entrance to Rectory Lane. The larger extension to Hoopers House is behind the terrace. What neighbours are more likely to notice is the construction period on one of the busiest stretches of the High Street; the Town Council’s request for mitigation of construction access and nuisance is recorded in the report, and a construction management plan is among the submitted documents. (Sevenoaks District Council, application 25/03201/LBCALT, documents)

Listed building consent alone does not let the school start work on the parts that need planning permission: the change of use of Hoopers House, the new extensions, the courtyard garden and boundary wall and the rooftop solar panels all sit within the still-pending application 25/03200/FUL. You can read every document, and comment on the outstanding application, on the council’s planning portal; our guide to Sevenoaks planning applications explains how to search by reference and set up tracking. The school’s most recent large boarding project on the record, a two-storey, 60-bedroom boys’ boarding house with three staff flats, was granted in 2017 under reference 17/02856/FUL. (Sevenoaks District Council, officer report, 25/03201/LBCALT, planning history (PDF))

For the wider picture of what is being decided across the district this summer, see Sevenoaks planning applications: 43 lodged to 7 August.

Sources

Image: The Old House, 18 High Street, Sevenoaks, by Tilman2007, CC BY-SA 4.0, via Wikimedia Commons.