Reading Bid Documents + Scope Reference
Why this matters
Commercial + larger residential projects come with a scope of work, blueprints, specifications, and addenda. Sub-contractors who can read these documents accurately bid correctly + execute correctly. Misreading the scope means either losing money on a low bid OR being non-competitive on a high bid. This is the field card.
Document hierarchy
When documents conflict, there's an order of precedence (usually stated in the contract):
- Modifications + change orders (most recent)
- Addenda (issued during bidding)
- Agreement / contract (the binding document)
- Specifications (written technical requirements)
- Drawings (architectural + engineering plans)
- Standards referenced (NEC, IPC, IBC, etc.)
When the spec says "Schedule A" and the drawing says "Schedule B", spec wins unless contract states otherwise. Field experience: always submit RFIs (Request for Information) to clarify conflicts BEFORE bidding OR during work.
Drawing types in a bid set
A-series (Architectural):
- Floor plans
- Elevations + sections
- Door + window schedules
- Finish schedules
- Detail drawings
S-series (Structural):
- Foundation plans
- Framing plans
- Structural details
M-series (Mechanical / HVAC):
- Equipment schedule
- Ductwork layout
- Piping layout
- Sequence of operations
- Controls + zoning
P-series (Plumbing):
- Fixture layout
- Drain + vent isometric
- Water supply layout
- Gas distribution
E-series (Electrical):
- Power plan (outlets, equipment)
- Lighting plan
- Riser diagram (panel + service)
- Schedules (panel, fixture)
FP-series (Fire Protection): sprinklers, fire alarm.
C-series (Civil): site, grading, utilities.
L-series (Landscape): site planting, irrigation.
Find your trade's series + read it fully. Then read adjacent series for context (your equipment is on M, but how it's powered is on E; how it's framed is on S).
Reading specifications (CSI MasterFormat)
Spec books are organized in divisions:
- Division 1: general requirements (permits, schedule, payment, closeout)
- Division 22: plumbing
- Division 23: HVAC
- Division 26: electrical
- Division 27: communications
- Division 28: electronic safety + security
- Division 33: utilities
- (and so on)
Within each division:
- Section ##-##-##: specific products / installation requirements
- Part 1: general (definitions, submittals)
- Part 2: products (materials, equipment, manufacturers)
- Part 3: execution (install procedures, testing, cleanup)
A typical bid requires reading 5 - 20 sections relevant to your trade.
Critical sections to read carefully
General Conditions (Division 1):
- Project schedule
- Substantial completion date
- Liquidated damages
- Insurance + bonding requirements
- Pay application process
- Lien rights / waivers
Your division's sections:
- Acceptable manufacturers (the "or approved equal" clause matters)
- Required submittals (shop drawings, samples, product data)
- Testing requirements
- Warranty terms
- Coordination with other trades
Skipping these = unpleasant surprises during execution.
"Furnish + install" vs "install only" vs "furnish only"
The scope often distinguishes:
- Furnish + install (F&I): contractor provides AND installs the item
- Install only: customer / general contractor provides the item; you install
- Furnish only: you provide; someone else installs
A bid for "install the rooftop unit" expects the unit to arrive - if YOU need to provide it, your bid was understated.
Read each line item carefully. The verb determines your scope.
Quantity vs lump sum
Lump sum (LS): fixed price for the whole scope. Risk on you for quantity variance.
Unit price: price per unit (per outlet, per linear foot of pipe, per square foot of roof). Risk on the GC; final cost = unit × actual quantity.
T&M with cap (time + materials, not to exceed): hourly rate + materials, capped at a total. Risk shared.
Different sections often use different methods. The "fire alarm" might be lump sum; the "miscellaneous additions" might be unit price.
RFIs (Request for Information)
Before bidding, OR during the bid, OR during construction:
- Submit RFI in writing (email OR formal RFI form)
- Reference specific drawing / section / detail
- Ask a specific question with multiple options if appropriate
- Don't assume; ask
The RFI process is your protection against scope creep + scope ambiguity. Architects + engineers respond + the answer becomes part of the project record.
Common bid mistakes
Missing addenda: bid issued, addendum changes things, bidder doesn't see it. Submitted bid is now wrong. Always confirm latest addendum before submitting.
Misreading scale on drawings: 1/8" = 1' vs 1/4" = 1' is a factor of 2 in linear measurement, 4x in area. Verify scale.
Skipping the spec details: pulling product details from drawings only, missing manufacturer requirements OR install details in the spec.
Not coordinating with other trades: your duct runs through electrician's wall cavity. Each scoped it; both expect access. Job conflict at install.
Underbidding: low bid wins but leaves you executing at a loss. Honest pricing beats winning + losing money.
Skipping coordination meetings: where ambiguities get worked out. The bidder who attends sees the project differently than the bidder who didn't.
Take-offs (quantity counting)
For your trade's portion:
- Count fixtures (outlets, registers, fixtures, runs)
- Measure linear footage (pipe, wire, duct)
- Calculate area (paint, drywall, flooring)
- Add waste factor (10 - 20% typical for materials)
- Add labor estimates per unit
Software helps (PlanSwift, OnScreen Takeoff, ConstructConnect). Manual on small jobs.
Inaccurate take-offs = inaccurate bid. Slow + careful beats fast + wrong.
Submittals + shop drawings
Most jobs require submittals before installation:
- Shop drawings: detailed drawings of fabricated items (ductwork, electrical panels)
- Product data: cut sheets for equipment + materials proposed
- Samples: physical samples for finish materials
- Schedules: detailed product schedules
The architect / engineer reviews + approves OR rejects. Installation must match approved submittals.
Building this into the schedule + cost matters. Submittal review can take 2 - 4 weeks.
Coordination meetings
Larger projects have:
- Pre-bid meeting (walkthrough; Q&A)
- Pre-construction meeting (project kickoff)
- Weekly progress meetings
- Specific coordination meetings (when scopes interact)
Attendance is often required by contract. Missing = missing the conversation that shapes the work.
Punch list + closeout
Near completion, the customer / GC inspects + creates a punch list of incomplete or deficient items. Closeout requires:
References
- CSI MasterFormat (Construction Specifications Institute)
- AIA contract documents
- ConsensusDocs forms
- State construction lien laws
- Manuall internal: Customer Documentation Discipline, Service Call Pricing Models