12 Scope Gaps in Commercial Drywall Bids (and How to Catch Them Before They Become Change Orders)

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You've got three drywall bids on your desk for a commercial or multi-family job. The numbers are 15% apart. Usually, that gap isn't about one sub being cheaper. It's about what each bid quietly leaves out.

After 25 years and more than 550 projects across Vancouver and the Lower Mainland, these are the items we see missed most often in drywall scopes. Use this as a checklist when you level bids, and ask every sub the same questions before you award.

1. Backing and Blocking

Who supplies and installs backing for millwork, TVs, grab bars, handrails, shelving, and wall-hung fixtures? If it isn't listed, it's usually excluded. Missing backing found after board is up means cutting finished walls.

Ask: "Is all backing per drawings included, including items shown only on interior design or millwork drawings?"

2. Deflection Heads

Top-of-wall deflection tracks are required wherever walls meet structure that moves. Some bids price standard track and leave deflection as an extra.

Ask: "Are deflection heads included where required, and are rated deflection joints included at fire separations?"

3. Firestopping at the Head of Wall and Penetrations

This is one of the biggest grey areas on any job. Does the drywall sub seal the head of wall joint? Who seals penetrations made by mechanical, electrical, and plumbing trades?

Ask: "What firestopping is in your scope, and what is excluded?" Then make sure the excluded items are carried by someone else.

4. Shaft Walls

Elevator shafts, stair shafts, and mechanical shafts often use a separate shaft wall system. Some bids include it; others assume it's priced separately.

5. Bulkheads and Soffits

Bulkheads for ducts, sprinklers, and lighting can add up fast, especially on residential floors of multi-family buildings. Check whether all bulkheads on architectural and mechanical drawings are included, not just those shown on the reflected ceiling plan.

6. Access Panels

Supply and install, or install only? Rated or non-rated? Access panels are small, but on a large building the quantity adds up.

7. Finish Levels

A bid priced at Level 4 throughout won't match a spec that calls for Level 5 in lobbies, corridors, or areas with critical lighting. Confirm the finish level for each area and how finish quality will be checked before paint.

8. Insulation Type

Thermal insulation, acoustic insulation in demising walls, and fire-rated insulation are different products at different prices. Make sure every bid carries the insulation the assemblies actually require.

9. Exterior Sheathing and Exterior Soffits

On some projects exterior sheathing, exterior gypsum soffits, or parkade ceilings fall into the drywall package. On others they belong to the envelope trade. Make sure it's carried once, not zero times or twice.

10. Access Equipment, Hoisting, and Garbage

Scaffolding, scissor lifts, material hoisting, stocking floors, and garbage removal can swing a bid significantly. Clarify who provides each and whether the price assumes use of the GC's hoist or crane.

11. Winter Conditions

Drywall compound needs heat to cure properly. On winter jobs, who provides temporary heat and ventilation, and does the schedule account for it?

12. Patching After Other Trades and Deficiency Rounds

Once walls are finished, other trades will still cut holes. Is patching after others included, charged as an extra, or backcharged? How many rounds of deficiency touch-ups are included before turnover?

Quick Bid-Leveling Checklist

Before you award your drywall package, confirm each bid covers:

Backing and blocking per all drawings
Deflection heads and rated head-of-wall details
Firestopping scope clearly defined
Shaft wall systems
All bulkheads and soffits
Access panels (supply and install)
Specified finish levels by area
Correct insulation types
Exterior sheathing and soffits (if applicable)
Access equipment, hoisting, garbage removal
Winter heat responsibility
Patching after others and deficiency rounds

The cheapest number on bid day isn't always the cheapest job at closeout. A clear scope up front protects your budget, your schedule, and your relationship with the owner.

Need a Clear Drywall Scope on Your Next Project?

Dynamo Drywall provides itemized commercial drywall bids for general contractors across Vancouver and the Lower Mainland, covering steel stud framing, drywall boarding and finishing, insulation, T-bar ceilings, and paint. If you'd like us to price your next project, or review the scope before tender, get a free estimate today or call us for your next project at (604) 401-5810.