Should you replace a roof or install a new roof over the old one?

Replace existing roof (recommended). Most homeowners choose this option. The contractor will tear off and dispose the existing roof before installing the new one. If there are any hidden leaks or water damages, the contractor will have a chance to fix them before installing the new roof.
Install new roof over the old one (a.k.a. overlay, reroofing). Most local codes allow installing a new layer of asphalt shingles over the old one. This option may save you up to 25%. The disadvantage is: if you have hidden leaks or damages under your roof, they will not be discovered, which may become a problem in the future.

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