Estimate Types at a Glance
Here are the most common estimate types contractors use, from earliest to most detailed:
- ROM (Rough Order of Magnitude): fast ballpark for feasibility
- Budget/Schematic: early scope with major systems priced
- Design Development (DD): refined quantities and assumptions
- Detailed/Definitive: full takeoff, cost codes, and labor/productivity
- Bid/Tender (Lump Sum): client-ready with inclusions/exclusions
- Unit Price: per-unit pricing with production rates
- T&M or Cost-Plus/GMP: service/remodel or transparency-focused work
Early-Phase: ROM & Budget Estimates
Use these when plans are light and speed matters more than precision. They set expectations and guide design without overcommitting.
- ROM: +/- 20–40% accuracy; based on historical costs per SF/LF
- Budget/Schematic: major systems priced with allowances
- Note assumptions, exclusions, and price-validity windows
- Great for feasibility and early client alignment
Preconstruction: DD to Definitive Estimates
As drawings mature, refine quantities and unit costs. This is where disciplined takeoff and cost codes shine.
- DD Estimate: updates from schematic; tighter allowances
- Definitive/Detailed: full quantity takeoff, labor burden, equipment
- Map every line to cost codes and future SOV groups
- Sets the baseline for contracts, projects, and job costing
Bid/Tender & Lump-Sum Pricing
Client-facing numbers with clear inclusions, exclusions, and terms. Often becomes the contract price.
- Bid/Tender: proposal-ready with scope and schedule notes
- Lump Sum: single price built from the detailed estimate
- Include allowances, change-order language, retainage terms
- Convert to SOV and AIA/progress billing if awarded
Unit Price & Assemblies
Ideal when exact quantities are uncertain. Owners pay by measured units; you control margin with production rates and assemblies.
- Define unit rates (LF, SF, EA) with labor, material, equipment
- Use assemblies for repeat tasks to price consistently
- Verify measurement rules and documentation in the contract
- Great for sitework, utilities, and maintenance scopes
T&M, Cost-Plus & GMP
Use when scope is evolving or transparency is required. Precision comes from strong field capture and documentation.
- T&M: bill actual hours and materials with agreed markups
- Cost-Plus: actual cost + fee; owner sees backups
- GMP: cost-plus with a ceiling; savings may be shared
- Requires tight time/materials tracking and approvals in the field
Choosing the Right Type for Your Job
Match estimate type to project maturity, risk, and client expectations.
- Concept/feasibility → ROM or Budget
- Design evolving → DD, then Definitive
- Hard bid → Bid/Tender (Lump Sum)
- Variable scope/service → Unit Price or T&M
- Owner transparency → Cost-Plus or GMP
How Werx Supports Every Estimate Type
Werx standardizes estimating and carries your structure into proposals, SOVs, and billing—so your numbers stay consistent from bid to final invoice.
- Build with templates, cost codes, and assemblies in Werx Estimates
- Convert accepted estimates to Contract Projects and SOVs
- Bill via AIA/progress or T&M methods
- Sync invoices to QuickBooks Online for clean financials
FAQs About Estimate Types
What’s the difference between an estimate type and a contract type?
Estimate types describe how you price work during preconstruction (ROM, budget, detailed). Contract types define how you get paid (lump sum, unit price, T&M, cost-plus/GMP). They’re related but not the same.
How accurate is each estimate type?
Accuracy tightens as detail increases: ROM is a ballpark, budget is directional, DD is closer, and detailed/bid estimates are the most precise because they use full takeoff and current pricing.
Can I mix estimate types on one project?
Yes. You might use unit prices for uncertain quantities and lump-sum lines for well-defined scopes. Clearly label each section and align it to your SOV and billing method.
TL;DR Recap
- Use early estimates (ROM/Budget) for speed; detailed/bid for contracts
- Unit price and T&M help when scope/quantities are variable
- Map estimates to cost codes and SOV for clean billing
- Werx carries estimates into proposals, SOVs, and invoices with QuickBooks sync
