Hope this helps you get started. My warranties are in writing. Funny thing is I haven't had a customer yet who seemed to care about the warranty document I give them after the job. Customers are probably so jaded that they figure to themselves "Good luck ever trying to get something fixed, even if it is in writing."
But I do include a copy of my warranty in my quote just as another selling point. It certainly can't hurt. Make sure you date and sign the warranty so there is no confusion when it expires.
The contractor signatory YOUR BUSINESS NAME HERE ("Contractor") hereby guarantees ___________________________________ ("Owner") that the construction ____________________________________ performed on that certain structure located at _______________________________________________________ to be free from defects in material and workmanship for a period of FILL IN THE YEARS HERE years from the date of this document.
This Standard Limited Warranty applies and is limited as follows:
1. To the property only as long as it remains in the possession of the original owner named above.
2. To the construction work that has not been subject to accident, misuse or abuse.
3. To the construction work that has not been modified, altered, defaced, or had repairs made or attempted by others.
4. That contractor be immediately notified in writing within ten (10) days of first knowledge of defect by owner or his agent.
5. That contractor shall be given first opportunity to make any repairs, replacements or corrections to the defective construction at no cost to owner within a reasonable period of time.
6. Under no circumstances shall contractor be liable by virtue of this warranty or otherwise for damage to any person or property whatsoever for any special, indirect, secondary or consequential damages of any nature however arising out of the use or inability to use because of the construction defect.
THE FOREGOING WARRANTY IS EXCLUSIVE AND IN LIEU OF ANY AND ALL OTHER APPLICABLE WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION, ANY IMPLIED WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. THIS WARRANTY MAY NOT BE ALTERED OR AMENDED. THIS WARRANTY DOES NOT APPLY TO ANY DAMAGE TO THE DECK CAUSED BY STRUCTURAL MOVEMENT, PHYSICAL ABUSE, WINDSTORM, LIGHTNING, HAIL OR OTHER CASUALTY OR ACT OF GOD. LIABILITY CEASES IF ANY ALTERATIONS, ADDITIONS OR REPAIRS ARE MADE EXCEPT IN ACCORDANCE WITH SPECIFIC WRITTEN INSTRUCTIONS FROM THE ISSUER OF THIS WARRANTY.