A Warranty Is Only as Good as the Company Behind It

Diamond Decks owns its crews rather than subcontracting them, has been at the same Severn address since 1993, and answers its own phone. The warranty below is short, plain, and honored by the same people who did the build.

5-Year Workmanship Warranty

Five years of labor and installation, starting from the date of the final walkthrough. If something traces back to how the project was built, the same crew that built it returns and corrects it. No charge.

The crews are direct employees of Diamond Decks. Not subcontractors. That is the difference between a warranty that means something and a warranty that means a phone call to a 1-800 number that nobody answers.

Manufacturer Warranties

Diamond Decks owns its crews rather than subcontracting them, has been at the same Severn address since 1993, and answers its own phone. The warranty below is short, plain, and honored by the same people who did the build.

Coverage varies by product line and collection. We will walk through the exact warranty terms for the materials specified on your project during the consultation.

Maintenance Guidance

Most composite warranties require basic upkeep to stay valid. Maintenance expectations get reviewed in detail at the final walkthrough, but the general rules are:

  • Composite Decking: Mild soap and water. High-pressure washing damages the cap layer and can void the manufacturer’s coverage. Skip the pressure washer.

  • Vinyl & Aluminum Railings: Periodic cleaning with soap and water. Abrasive cleaners and harsh solvents degrade the surface finish over time.
  • Underdeck Systems: Zip Up and Trex Rain Escape are water-management systems, not waterproofing systems. Periodic inspection of the channels and drainage points keeps them performing as designed.


Material-specific guidance for everything else gets reviewed at the final walkthrough.