What is included in Mechanical Plans?

Our Mechanical Plans are a permit-ready drawing set that documents the complete HVAC and ventilation design for your ADU — the equipment, its sizing math, where every component goes, and how the air moves. They give the plan reviewer everything needed to confirm the system is safe, correctly sized, and code-compliant, and they coordinate cleanly with your Title 24 report.

What the drawing set contains

A typical ADU mechanical set runs one or two sheets (M-1, M-2) and includes:

• Mechanical floor plan showing the indoor equipment, supply/return points, exhaust fans, and the outdoor condenser location with required property-line and window setbacks.
• Equipment schedule — a table listing each unit's manufacturer, model number, capacity in BTU/hr, and efficiency ratings (SEER2/HSPF2 for heat pumps), so the reviewer can verify Title 24 minimums.
• Heat-load (Manual J) summary establishing the peak heating and cooling loads the equipment is sized to.
• Mini-split head and condenser layout with refrigerant line-set routing drawn from each indoor head to the outdoor unit.
• Duct layout where a ducted system is used, including register locations and duct sizing.
• Ventilation design per ASHRAE 62.2 — the whole-building mechanical ventilation rate and equipment, plus local exhaust (bath fans, kitchen hood ducted to the exterior).
• Condensate drainage routing for the indoor units.
• Combustion air details if any gas appliance is permitted in your jurisdiction.
• General notes and a title block citing the applicable codes (CMC, CBC, Title 24) and identifying the project.

How it coordinates with Title 24

The equipment listed on the mechanical schedule must match the equipment modeled in your energy-compliance documents. When you bundle a Title 24 report, we keep the make, model, and efficiency ratings consistent across both, which prevents one of the most common plan-check corrections — a mismatch between the drawings and the energy calcs.

What you receive — checklist

1. Mechanical floor plan with equipment locations and setbacks.
2. Equipment schedule (make, model, BTU/hr, efficiency).
3. Manual J load-calculation summary.
4. Line-set and/or duct routing.
5. ASHRAE 62.2 whole-building ventilation plus local exhaust.
6. Condensate, combustion air (if gas), notes, and title block.

Mechanical plans are sized to your ADU's square footage and climate zone, not pulled from a template — the load calculation drives the equipment selection.

Sheet counts, local amendments, and submittal requirements vary by jurisdiction — confirm specifics with your local building department. Our Mechanical Plans start at $995 as a single discipline, and you can pair them with electrical and plumbing in the size-scaled Full MEP package. See pricing or start your order.