Yes, but much of the town will want a say first. Hundreds of listed buildings. Four conservation areas. Clay under every garden. The town has been running on paperwork since a royal charter, and an extension here is mostly a negotiation with the past.
Maldon has 289 listed buildings: 7 at Grade I, 13 at Grade II* and 269 at Grade II. Listing covers the whole building, inside and out, so changing a listed home, from an extension down to a window or an internal wall, needs listed building consent on top of any planning permission, and the work has to respect what made the building worth listing. Henry II granted the town a charter in 1171, and a fair amount of Maldon has been asking permission ever since.
There are four conservation areas in and around the town: Maldon itself, Heybridge Basin, Langford and Woodfield Cottages. Inside them, changes that would elsewhere go ahead without an application, such as some extensions, roof alterations, cladding or the loss of trees, can need consent, and the council judges each one against the character of the area. The Chelmer and Blackwater Navigation starts here, and so, for anyone in Heybridge Basin with a plan for a porch, does the paperwork.
Three scheduled monuments sit within the area, the strictest tier of protection there is, among them the remains of the medieval leprosy hospital of St Giles. They matter mainly to land next to one, where even digging a foundation can need its own consent.
None of this stops people trying. Maldon District Council received 1,119 planning applications for the area between April 2024 and June 2026, and 497 in the last twelve months alone. That is a town altering its homes all the time, and with 497 applications a year passing across the same desks, the neighbours have almost certainly had the idea first and will be reading the list when yours goes in.
The ground has a vote too. The British Geological Survey puts Maldon's shrink-swell hazard at class 3, and the whole area reaches that class. That means clay soils that swell when wet and shrink when dry, which affects how deep an extension's foundations need to go and how close it can sit to trees. It calls for a structural engineer's view at the design stage, and it is a known, manageable issue. The clay is the one constraint in Maldon with no consultation period, and it does not change its mind.
In practice, an ordinary post-war house outside the conservation areas and away from listed buildings can often extend under permitted development, the national rights that allow some work without a full application. Inside a conservation area, or anywhere near a listed building or monument, those rights shrink and consent becomes the starting point. The one check that saves money is Maldon District Council's planning map for the exact house, which shows whether it is listed or inside one of the four conservation areas, and should be read before any architect is paid.
Freedom to extend in Maldon is limited: the newer streets leave room to build, but the old town, the waterside and the clay all make a buyer's plans slower, dearer and more negotiated than they first look.