Should we demolish part of the house that’s got termites in it?
First up, the answer depends on what type of termites are creating the problem. If they are drywood termites, then maybe knocking things down will kill them, but if these are subterranean termites then definitely not. Drywood termites live in small colonies, usually in individual pieces of timber, so a thoughtful demolition may effectively remove active colonies. Subterraneans don’t; they like to spread out through the structure and will have several paths to ground (for water). At the first strong vibrations, they will just go to ground and come back up later to resume the attack, perhaps even somewhere a bit further away. Early repairs just makes them harder to control and may cost you a lot more money. Once you open up their workings, the fresh, drying, air will force the termites to retreat.
With all types of termite, the individual does not matter. You can kill about half the termites in a colony and have it recover. You have to destroy the colony itself. This is often best done with baits, dusts or non-repellent soil poisons. It takes time. At least a month, maybe several months to more than a year.
To be certain of the right course of action, you need a specialist termite inspection report and that means a competent inspection of the whole site by someone who really knows what they’re doing, has the right tools, and uses them. Once you know the which, where and the why, you are ready to make a good decision. But in general, it is almost always best to control the colonies before you undertake and repairs or major changes unless the damage is a safety or security hazard.