If you’re looking for quotes or a tradesperson to help you out, you may be best off posting a job on ratedpeople.com. I’d suggest using the Damp Proofing category under Specialist Tradesman. Up to three tradespeople will be in touch to help. Hope it all goes well.
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Post your job on rated people as there is plenty of companies that use Rated People , depending on what area you live in you will probably get a few responses , we operate in the Nottinghamshire /Lincolnshire area , I will keep an eye out for your posting and respond