Mostly, yes. Heritage protection here is thin and patchy, with no buildings in the top listing grades. Two conservation areas cover small parts of the map. The neighbours file planning applications constantly. The ground is the bigger obstacle, not the planners.
Chadwell Heath has 14 listed buildings, every one of them Grade II. None is Grade I or Grade II*. Grade II still means listed building consent for almost any change that affects a building's character, inside or out, and that includes the windows, the roof and the back wall where an extension would go. If your house is one of the 14, every alteration needs consent. If it is not, the listing touches you only as a neighbour.
There are two conservation areas, Little Heath and the Chadwell Heath Anti-aircraft Gun Site. Inside them the council takes a closer interest in anything visible from the street, such as front extensions, demolition and some changes that would elsewhere go ahead without an application. Chadwell Heath is split between Redbridge and Barking and Dagenham, so ask which of the two councils handles planning for the house you are looking at, and whether it falls inside the Little Heath conservation area. A short email to the right council now saves a long argument with the wrong one later.
The neighbours are not shy. Between March 2024 and July 2026 the area produced 826 planning applications, 326 of them in the last twelve months. That says nothing about how many were approved, but it shows that altering a house here is ordinary business. When a terrace sells for about the same as a semi, adding a room is how people get more house without moving.
The bigger obstacle is underneath. The British Geological Survey puts the whole area in class 3 for shrink-swell ground, its published hazard class for clay that swells when wet and shrinks when dry. That does not stop anyone building, but it does affect how they build. Expect deeper foundations than a builder would dig on firmer ground, and get a structural engineer's view early, especially near trees. Every extension in Chadwell Heath goes down into the same clay, and the clay always gets its say.
Four of the listed buildings in the area are on Historic England's Heritage at Risk register. That means they are in poor condition, and their repair may qualify for grants and will be watched closely by the authorities. It matters to whoever owns them. For the owner of an ordinary terrace a few streets away it changes nothing.
For most houses outside the two conservation areas and the 14 listed buildings, the national permitted development rules cover modest rear extensions and many loft conversions without a full planning application. Anything larger, anything at the front, and anything on a listed or conservation-area property goes through the council. Confirm which route applies in writing from the council, whatever the builder says.
Your freedom to extend here is middling. The planning rules are light for most houses, the clay is not, and a project that ignores the ground will cost more than one that ignores the planners.