I have been doing residential shingle roofing work for about 14 years now. Most of the repairs come with a 1 to 3 year guarantee. The guarantee is a big deal since many of the repairs I do are actually "go behinds" other roofing companies who for some reason will not come back or refund the homeowners money. I have refunded homeowners on several occasions but the more experience I acquire the less often it is necessary. Masonry chimneys have been the only real cause for refunds and I think that is understandable. Doing all the work myself has proven to be the most effective method for me and most desirable for homeowners not having to deal with middlemen and the inherent issues involved with that. Thank you for your consideration. Dave.