IP20 9DE South Norfolk

Streets

• Mendham Lane, South Norfolk: 27 addresses
• Mendham Close, Harleston: 1 address
• Unnamed street near Mendham Lane, Harleston: 1 address

Council tax

What each band costs in South Norfolk in 2026-27: Band D £2,483 a year on average, including the police, fire and any county and parish charges.

Homes by band in the neighbourhood around this postcode: most are in band B (36% of about 1,200 homes).

Sources: Valuation Office Agency, Council Tax: stock of properties, homes at 31 March 2026 (counts rounded to the nearest 10; some small counts withheld), for the neighbourhood (census area of about 700 homes) around it, not just this postcode; Ministry of Housing, Communities and Local Government, council tax levels 2026-27. Bands are charged as fixed shares of Band D; the actual bill depends on the parish and on discounts such as the single-person discount. Check a home's own band with the official council tax band checker.

Planning and heritage

• Conservation area: yes, Harleston Conservation Area (council page). Extensions, demolition, some windows and doors, and work on trees need consent.
• Listed buildings within 100 m of this postcode: 16.
• Article 4 direction (removing permitted development rights): none recorded, though not every council has published theirs.
• Tree preservation orders: none recorded, though not every council has published theirs.
• Green belt: no.

Listed buildings

• 1 AND 3, MENDHAM LANE, grade II
• 1, KEELEY'S YARD, grade II
• 4 AND 6, OLD MARKET PLACE, grade II
• 9, EXCHANGE STREET, grade II
• BUILDING ADJOINING AND IMMEDIATELY EAST OF NO 1, grade II
• CORN EXCHANGE, grade II
• GRIFFONS, grade II
• Harleston United Reformed Church and church hall, grade II
• MAGPIE HOTEL AND STABLES ADJOINING EAST, grade II
• NO 2 AND ADJOINING HOUSE TO SOUTH, grade II
• POST OFFICE, grade II
• PUBLIC CONVENIENCES IMMEDIATELY WEST OF CORN EXCHANGE, grade II
• STABLES IMMEDIATELY SOUTH OF THE OLD HOUSE, grade II
• THE CHESTNUTS, grade II
• THE DELFT HOUSE, grade II
• THE OLD HOUSE, grade II

Brownfield land registered for housing within 1.0 km

• Apollo Club, Mendham Lane, Harleston, Planning Permission (230 m)
• Apollo Club, Mendham Lane, Hartleston, not permissioned (230 m)
• Maltings, Tudor Rose Way, Harleston, permissioned (400 m)
• Maltings, Tudor Rose Way, Harleston, Planning Permission (410 m)
• Former Howard Rotavator Works, Mendham Lane, Harleston, Local Plan Allocation with Planning Permission (470 m)
• Former Howard Rotavator Works, Mendham Lane, Harleston, permissioned (470 m)
• Land off Station Hill, Planning Permission (680 m)

Source: planning.data.gov.uk (Ministry of Housing, Communities and Local Government), compiled from councils and, for listed buildings, Historic England's National Heritage List. Conservation areas, Article 4 directions, tree preservation areas and the green belt are checked at each postcode's centre. Listed buildings and protected trees are counted within 100 m of this postcode. Councils publish Article 4 directions, tree preservation orders and brownfield registers to different standards, and some not yet. Planning applications are not here: there is no national open record of them yet.

Flood risk

Rivers, the sea or surface water: in this postcode, 0 addresses are in areas at high risk, 3 at medium risk and 4 at low risk. Each address counts once, at the higher of its rivers-and-sea and surface-water risk.

Rivers and the sea alone: no home is in an area at risk.

High: 3.3% (1 in 30) or more chance of flooding a year. Medium: 1% to 3.3%. Low: 0.1% to 1%. Very low: under 0.1%. The rivers and sea figures allow for flood defences. Counts cover whole postcodes, which can include other streets.

Flood zone for planning: no postcode centre is in flood zone 2 or 3.

Sources: Environment Agency Flood risk: postcode search tool data (loaded 29 October 2026), Risk of Flooding from Rivers and Sea: postcodes in areas at risk (loaded 29 October 2026) and Flood Map for Planning (loaded 28 October 2026). Flood zones are checked at each postcode's centre point. These are models of areas, which their publishers say are not suitable for showing whether an individual property is at risk, and they do not cover flooding from sewers or drains. Check an address on the official long-term flood risk service.

Broadband

Superfast 100%, ultrafast 96%, gigabit 96% of premises; 0% cannot get 10 Mbit/s. Ofcom Connected Nations, data as at January 2026.