Yes, in theory. Slowly, in practice. The town carries 222 listed buildings, 16 conservation areas, and 57 scheduled monuments across the wider patch. Around 140 planning applications landed in the past year, which is the working volume of a town where most meaningful alterations need permission. Anyone who wanted to change a window without filing a form has bought in the wrong postcode.
The listed-building picture sits at the heart of the constraint. Eastbourne carries 222 listed buildings between its postcode districts: 12 at Grade One, the most protected category, 16 at Grade Two Starred, and 194 at Grade Two. For a building on any of those lists, any change that affects its character requires listed-building consent on top of normal planning permission. That includes the windows, the doors, internal partitions of any historic importance, the chimneys, and the kind of materials and finishes that would pass unnoticed on a standard house. The consent process is not a friendly side conversation with a planning officer. It is a formal application with drawings, heritage statements, and very often a heritage consultant retained at the owner's expense. Refusal is more common than approval where the proposed change is judged to harm the listed character. The 12 Grade One properties in the town are the most heavily defended and the least negotiable. Owning one is closer to custodianship than ownership in the way most buyers mean the word.
Conservation areas add a second layer on top. Eastbourne has 16 of them, taking in Torfield, Warrior Square, Willingdon, Ratton, Park Close, Upperton, Meads, and the Town Centre and Seafront among others. Inside a conservation area, what would normally count as permitted development under national rules can be reduced or removed, with the practical effect that minor changes the rest of the country can do without paperwork need a full planning application here. Removing a tree above a certain trunk size needs notification. External cladding, dormer windows, side extensions, satellite dishes on the front elevation, and certain types of fencing can all need consent that a non-conservation-area property would be free to install. The boundaries of each area are mapped to a specific street pattern and a specific architectural character, so two houses on the same street can sit under entirely different planning regimes.
What it means in practice is a two-speed town. Outside the listed and conservation patches, normal permitted-development rules apply. A rear single-storey extension within the standard limits, a loft conversion that respects the roof line, and most internal works can proceed without a full planning application. Inside the heritage layer, almost everything visible from a public realm needs consent, and the council will read the application against the conservation-area appraisal document that defines what is and is not protected. The result is that the prettiest parts of Eastbourne, the parts that command the price premium, are also the parts where altering anything requires the most paperwork and the most patience.
Eastbourne scores one out of five on the freedom to extend or alter a home, which is the lowest possible reading and the honest one. The townscape is well-kept because the planning system has held the line for generations. That is the trade.