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:
- Punch list completed and signed off, item by item, with the sign-off in writing. An unclosed punch item is the hook that holds retainage
- As-built drawings marked up to show what was actually installed where it differs from the contract documents
- Operation and maintenance manuals for the installed equipment, in the format and copy count the specification calls for
- Warranty documents, both the manufacturer's and your own workmanship warranty, with the start dates stated
- Test and balance reports, startup reports, and commissioning documentation where the specification requires them
- Final inspection sign-offs and the certificate of occupancy where applicable, with your trade's permits closed
- Owner training, delivered and documented, sometimes with a recording required by the specification
- Attic stock and spare parts turned over per the specification: filters, keys, touch-up material, whatever was listed
- Lien waivers from you and from every supplier and subcontractor below you, which is usually the condition on the final payment
- Final application for payment and release of retainage, submitted only once everything above is in
Read the closeout requirements at bid time, not at the end. They are labor and they take weeks, and a project that is physically finished can sit unpaid for months on missing paperwork. Assign someone to own the closeout package from the start of the job.
References
- CSI MasterFormat (Construction Specifications Institute)
- AIA contract documents
- ConsensusDocs forms
- State construction lien laws
- Manuall internal: Customer Documentation Discipline, Service Call Pricing Models