Quick Answer
A properly prepared homeowner receives 30-50% less quote variance and avoids costly change orders. Complete this checklist before scheduling contractor site visits to ensure accurate, comparable bids.
Why Quote Preparation Matters
Contractor quotes vary widely because each estimator makes different assumptions about your project. When you provide complete specifications upfront, you eliminate guesswork and receive bids you can actually compare. Key benefits:
- Apple-to-apple comparisons: All contractors bid the same scope
- Fewer surprises: Hidden costs identified before signing
- Faster installation: Permits and materials ready in advance
- Lower change orders: Up to 40% reduction in mid-project additions
Pre-Quote Site Assessment
Electrical System Inventory
Gather this information about your current electrical setup:
- Panel details: Manufacturer, amperage (100A/200A), and available breaker spaces
- Panel photo: Clear picture of inside cover with breaker layout
- Service type: Overhead vs underground utility service
- Meter location: Distance from proposed generator site
- Foundation type: Concrete slab, pavers, or dirt at generator location
Load Requirements Documentation
Calculate your power needs systematically:
- Essential circuits: List must-run items (HVAC, well pump, refrigerator, sump pump, medical equipment)
- Starting wattage: Note any large motors (well pumps, AC compressors)
- Square footage: For calculating whole-home load estimates
- Fuel preference: Natural gas available at property? Propane tank acceptable?
- Future plans: Pool, addition, or electric vehicle charging considered?
Property Mapping
Create a simple site diagram showing:
- Generator location: Preferred placement with dimensions
- Gas meter location: For natural gas installations
- Electrical panel location: Distance from generator site
- Property lines: For setback compliance
- Obstacles: Trees, fences, AC units, sprinkler systems
Permitting Research (Do This First)
Local Requirements Investigation
Before calling contractors, verify:
- Zoning setback requirements: Distance from property lines and structures (typically 5-10 feet)
- HOA approval needed: Check architectural guidelines for placement and appearance
- Building permit requirements: Some municipalities require licensed installer only
- Electrical permit: Who pulls—contractor or homeowner?
- Gas permit: Required for fuel line work in most jurisdictions
- Noise ordinances: Decibel limits may affect placement or enclosure requirements
Utility Company Requirements
Contact your gas and electric providers:
- Gas line capacity: Current line size and maximum BTU capacity
- Meter upgrade needed: Larger meter may be required for 22kW+ units
- Electric interconnect: Net metering or transfer notification needed?
- Inspection requirements: Utility company inspection after gas work?
Fuel System Planning
Natural Gas Checklist
If choosing natural gas:
- Verify gas availability: Confirm service at street or existing line on property
- Check current meter size: Standard 250 CFH may need upgrade for larger generators
- Measure distance: From meter to proposed generator location
- Pressure test required: Most municipalities require post-installation pressure test
- Line sizing: Contractor should calculate required pipe diameter for generator demand
Propane System Checklist
If choosing propane:
- Tank size needed: 100-gallon (3-4 days) vs 500-gallon (1-2 weeks runtime)
- Tank placement: Underground vs above-ground (affects cost and aesthetics)
- Lease vs purchase: Tank leasing available from propane suppliers
- Fill agreement: Automatic delivery vs will-call
- Setback requirements: Propane tanks have specific distance requirements from buildings
Contractor Quote Request Template
Use this format when requesting bids:
PROJECT SCOPE SUMMARY:
Generator Size Requested: ___ kW
Fuel Type: [ ] Natural Gas [ ] Propane
Transfer Switch Type: [ ] Whole-house [ ] Essential-circuits only
LOCATION DETAILS:
- Proposed generator location: ___________________
- Distance from electrical panel: ______ feet
- Distance from gas meter/propane location: ______ feet
- Concrete pad: [ ] Needed [ ] Existing
PERMITS:
- [ ] Include all permit costs in quote
- [ ] Include all inspection fees
INCLUDED IN QUOTE:
- [ ] Generator unit (manufacturer/model)
- [ ] Transfer switch (amperage)
- [ ] Concrete pad or mounting system
- [ ] Electrical labor and materials
- [ ] Fuel line installation (if applicable)
- [ ] Startup, testing, and owner training
- [ ] Warranty registration
TIMELINE:
- Permit acquisition: _____ weeks
- Installation duration: _____ days
- Start date available: _____________
WARRANTY:
- Unit warranty: _____ years
- Labor warranty: _____ years
- Annual maintenance cost estimate: $_____
Red Flags in Contractor Quotes
Warning Signs
Be cautious of quotes that:
- Vague descriptions: “Electrical work” instead of “100A subpanel installation with 6-circuit transfer switch”
- Exclusions buried: “Owner to provide X” without specifying cost
- Permit not included: “Owner responsible for permits” without cost estimate
- Lowball unit: Unfamiliar generator brands with inflated “installation” to compensate
- No line items: Single total price without breakdown
Required Line Items
Every proper quote should include:
- Generator unit: Make, model, kW rating, MSRP vs discounted price
- Transfer switch: Amperage, type (automatic vs manual), circuit count
- Electrical work: Panels, conduit, wire gauge, disconnect requirements
- Fuel system: Pipe material, diameter, trenching depth, pressure test
- Site preparation: Excavation, concrete pad dimensions, gravel backfill
- Permits/fees: Line-item breakdown with separate permit costs
- Labor: Hours estimated or not-to-exceed labor total
- Warranty: Unit, labor, and workmanship terms separately stated
Post-Quote Comparison Checklist
When comparing multiple bids:
- Same unit specs: Comparing identical kW ratings and features
- Same scope: All include permits, startup, cleanup, warranty
- Payment terms: Deposit amount, progress payments, final payment timing
- Timeline: Start date and completion date guaranteed
- Change order policy: How unexpected costs are handled
- Subcontractor disclosure: Who performs the actual work
Related Guides
For comprehensive planning:
- Home Standby Generator Installation Cost Calculator
- Generator Installation Timeline and Hidden Costs
- Generator Permit and Inspection Fee Calculator
- Standby Generator Size vs Cost Estimator
FAQ
How many contractor quotes should I get?
Three to four quotes is optimal. Fewer than three limits your comparison; more than four becomes time-consuming with diminishing returns.
Should I share other contractors’ quotes?
Share your scope requirements but not specific pricing. This keeps competition fair while ensuring everyone bids the same work.
How long are quotes valid?
Most quotes are valid 30-60 days. If your timeline exceeds this, confirm pricing remains valid before signing.
Can I negotiate contractor quotes?
Yes, but focus on scope clarification rather than demanding discounts. Ask for detailed line-item breakdowns that may reveal unnecessary costs.
What if quotes vary by more than 30%?
This usually indicates different assumptions about scope. Request a scope reconciliation meeting to identify differences before selecting.
Do I need a site visit for accurate quotes?
Yes. Quotes based on photos or phone conversations are preliminary. Only an on-site evaluation can identify trenching challenges, electrical upgrades, or permit requirements.
Next Step
Complete your checklist using the Home Standby Generator Cost & Outage Payback Simulator to estimate your project parameters, then request detailed bids from at least three licensed contractors. Compare their quotes using the template above to ensure you’re making an informed decision.
Preparation prevents poor performance—and costly change orders. Use this checklist systematically before inviting any contractor to your property.