Block Management in Highcliffe

Open coast on Christchurch Bay, and the position is a cliff top rather than a beach frontage. That has a practical consequence visible in the flood data: the East coast of Dorset tidal area stops 59 metres short of the built-up area, because the settlement sits above the tidal flood extent rather than in it. The exposure here is therefore salt-laden air and wind-driven rain rather than tidal inundation, and external metalwork, fixings, glazing and coatings should be specified for a marine atmosphere. Erosion, not flooding, is the coastal risk that matters here, and it is unusually well documented. The shoreline management plan, adopted on 1 July 2011, puts Highcliffe in a policy unit running from Highcliffe to Friars Cliff and gives it hold the line across all three epochs, to 2025, to 2055 and to 2105, with the published note that detailed consideration will be needed of the case for defending Highcliffe Castle in the long term. Its baseline erosion rate, meaning the rate that would apply if the defences failed, is 1.1 metres a year, or 120 metres over a hundred years, and it records that erosion is currently resisted by defences and the slopes stabilised. The national coastal erosion mapping published in 2025 puts the same point numerically: with no future intervention the main Highcliffe frontage would lose 21 metres by 2055 and 34 metres by 2105 under a present-day climate, rising to 73 metres by 2105 on the upper-end climate allowance, while with the shoreline plan delivered every figure is zero and the frontage is classified as erosion restricted. The defences themselves are a permeable revetment with rock groynes and slope drainage, rated mainly good to fair by the council with an unknown standard of protection. Their construction date is contradicted within the council's own strategy documents, one part saying the 1970s and another the 1980s, so neither is stated as fact here. A future scheme is programmed rather than built: the Christchurch Bay and Harbour strategy adopted in December 2025 covers this frontage as a distinct unit between Steamer Point and Chewton Bunny, with appraisal timetabled for 2030 to 2034 and construction for 2035 to 2039. Its leading national option carries a present value cost of 5.4 million pounds against benefits of 6.9 million, a benefit-cost ratio of 1.28. On properties, the strategy states that 18 are expected to be at risk within the next 50 years and 191 within the next 100. For anyone taking a long lease or planning major works on this frontage, the material point is that the policy is to hold the line, that the works to deliver it are a decade away from construction, and that the numbers above are the published basis for both.

The measurable part of marine exposure is corrosion. A high-salinity coastal atmosphere is category C5-M in the standards, where unprotected steel can lose 200 micrometres in a year. In practice that means the metalwork on a Highcliffe block sets the inspection interval, and the reserve fund follows the inspections rather than a standard cycle.

Decided under the Christchurch and East Dorset Local Plan Part 1 Core Strategy, adopted by Christchurch Borough Council on 22 April 2014, together with saved policies from the Christchurch Local Plan of 2001 and the joint minerals and waste plans. The council publishes a dedicated Highcliffe inset to its policies map. The Highcliffe and Walkford Neighbourhood Plan is made, and unusually for this part of the county the full referendum record is published: the neighbourhood area was designated on 2 December 2020, the referendum was held on 15 December 2022 and carried by 1,681 votes to 274, 86 per cent, on a turnout of 16.89 per cent, and the plan was made by full council on 10 January 2023. A single authority-wide local plan is emerging but not adopted, with submission timetabled for 26 May 2028 and adoption indicated for 31 January 2029. There is no Article 4 direction anywhere in the former Christchurch area, established by reading the authority's three directions themselves rather than from the national dataset, to which it has published nothing. One trap worth naming: a national dataset query over Highcliffe returns two Article 4 records that appear to cover 91 per cent of the place, but both were issued by New Forest bodies with no jurisdiction here, and their polygon is a 13,000 hectare shape covering the Solent and the New Forest. It is a mapping artefact and not a control on any building in Highcliffe.

Worth knowing before a block plans a conversion, a subdivision or a change of use, because it decides whether the scheme is arguable at all, well before the consent question under the lease arises.