Mostly yes. Halling's heritage rulebook is short. There are four listed buildings. There's one conservation area. There's one scheduled monument. Unless you've bought one of the protected few, the extension is a matter of paperwork, not a battle.
Historic England lists four buildings in Halling. One is Grade I, one Grade II* and two Grade II. Listing covers the whole building, inside and out, so almost any alteration that affects its character needs listed building consent on top of planning permission, and doing the work without it is a criminal offence rather than a planning slip. With four, the odds of buying one without knowing are slim. The odds of a Grade I owner getting approval for bifold doors are slimmer.
There's one conservation area, which carries the village's name. Inside it, demolition, some extensions and changes to how a house looks from the street need more scrutiny, and trees get protection that the garden centre won't mention. Outside it, that extra layer doesn't apply. Check which side of the boundary a house sits before you picture the loft conversion.
There's one scheduled monument in the area, with the bishop's palace at Halling among those nearby. Scheduling is the strictest protection there is, and it mainly matters to anyone owning land on or beside a monument. For almost every garden in the village it won't come up.
The neighbours clearly aren't put off. From April 2024 to June 2026, 639 planning applications were logged for the area, with 269 in the last twelve months. That's steady evidence that people here extend, convert and rebuild as a matter of course. Whether each one succeeded is a separate question, and that count doesn't answer it.
In practice, most houses outside the conservation area and not listed can use permitted development rights for modest rear extensions, loft conversions and outbuildings, within national size limits and without a full application. Check that the rights haven't been removed for a particular house or estate by a condition on its original permission, and get a lawful development certificate before building rather than arguing afterwards. Inside the conservation area, or for a listed building, assume you need consent and talk to Medway's planners first.
Freedom to extend is one of Halling's strengths: the protected buildings are few and easy to spot, and everywhere else the usual national rules apply.