I would be inclined to ignore the possibility of this person being out of the country as in all probability this is a smokescreen. You have the right to enforce the judgement by one of the available methods and should press on and do so.
Much will depend upon whether the judgement is against the builder personally or a limited company. Also whether there is any property over which to get a charging order or assets that can be seized.
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• Get a divorce
• Have contact with my children
• Make a small claim
•Write a letter of claim
•Obtain a Grant of Probate
•Get legal advice and help with my case
•Make a Will
•Change my Name
•Prepare a legally binding agreement
• Sever a Joint tenancy
• Prepare a Partnership Agreement
• Sell a Jointly owned Property
• Appoint a Guardian for my children