Will Stonehenge Become Reform's...
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For more on marking an answer as the "Best Answer", please visit our FAQ.There is a time limit after which a Local Authority cannot take enforcement action against work done without planning permission. It is either 4years or 10 years, depending on the circumstances. Your conveyancing solicitor should be able to tell you. You need proof of when the extensions were built. If you are not outside the time limit do not go ahead.
Building Regulations is a different matter. You certainly need indemnity insurance as it could otherwise be difficult to sell later on. It should cover you against any claims arising from the work possibly being done not in accordance with the regulations. Any conveyancing solicitor should know about this subject and be able to suggest insurers, but the seller should certainly get it (probably through his solicitor) and pay for it.