How to Respond to Mechanical and Plumbing Plan Check Comments

Mechanical and plumbing plan check comments are rarely solved by a short email alone. Reviewers usually need revised drawings, clear response notes, and coordination between the architect, engineer, energy documentation, and contractor.

A disciplined response package can shorten the resubmittal cycle and reduce the chance that one correction creates another conflict elsewhere in the set.

1. Sort comments by discipline and sheet

Start by grouping comments into mechanical, plumbing, energy, architectural coordination, and administrative items. Then map each comment to the affected sheet, detail, schedule, or calculation. This prevents the team from answering a comment in the narrative but forgetting to revise the drawing.

For scope support, see Strata’s mechanical engineering and plumbing engineering services.

2. Identify comments that affect Title 24 or HERS

Mechanical comments often change energy assumptions: equipment efficiency, ventilation rates, duct location, system type, or control sequences. Plumbing comments may affect water heating, recirculation, fixture assumptions, or CALGreen documentation.

When a response changes the energy basis of design, update the related forms and notes instead of treating the engineering revision as isolated. For linked compliance work, reference Title 24 compliance and HERS testing.

3. Write responses that tell the reviewer where to look

A strong response does three things:

• Answers the comment directly
• Identifies the revised sheet, detail, or calculation
• Explains any design decision that is not obvious from the drawing alone

Avoid vague responses such as “addressed” unless the drawing change is extremely simple. Reviewers move faster when the response points them to the exact correction.

4. Keep architecture and MEP synchronized

Many plan check issues are coordination issues: shaft space, ceiling depth, equipment access, condensate routing, gas or water sizing, exhaust discharge, or roof equipment locations. If the mechanical or plumbing sheet changes, check whether architectural backgrounds, roof plans, reflected ceiling plans, and specifications need matching revisions.

For location-specific support, use the approved service-area pages for Sacramento, Seattle, and Brentwood.

5. Submit a complete correction package

Before resubmittal, confirm that the response letter, revised sheets, calculations, and compliance forms all share the same design assumptions. Partial packages can trigger repeat comments even when the technical answer is correct.

If you need help triaging comments, send the correction letter, current drawings, and resubmittal deadline through contact.