OneEstimate
OneEstimate: HVAC-focused takeoff and proposals with a permanent free tier and web delivery. Ranked #5 of 28 in HVAC Estimating Software by our editors (7.7/10); pricing: Free plan; best for small HVAC teams wanting low-cost takeoff and proposals.
At a glance
- Editor score7.7 / 10
- PricingFree plan
- Best forSmall HVAC teams wanting low-cost takeoff and proposals
- Free planYes
- Paid from$19/mo
- HVAC cost databaseYes
- Facts checked24 Sep 2026
Where it wins
- HVAC assemblies cover equipment, ductwork, insulation, and refrigerant
- On-screen takeoff measures duct runs and counts fixtures or equipment
- Branded PDF proposals and Excel exports support client-ready estimates
Where it doesn't
- Free and START plans limit takeoff to one per project
- The product is available through the web only
- Business-level BIM support is limited to IFC import
Our verdict on OneEstimate
OneEstimate is browser-based estimating software tailored to HVAC contractors and small construction teams. Its assemblies cover equipment, ductwork, insulation, refrigerant, diffusers, and grilles, while plan takeoff converts measured quantities into estimate line items. Users can upload PDF or image plans, calibrate scale, measure duct runs, count fixtures and equipment, edit labor and material costs, and organize estimates by zone, floor, or equipment. Branded PDF proposals and Excel export extend the workflow beyond takeoff.
The pricing structure starts with a permanent Free plan that allows one takeoff per project. START costs $19 per month, billed monthly, and includes two estimates with one takeoff per project. PRO costs $49 per month and adds AI access, Excel import, PDF download and Excel export, plus four takeoffs per project with revisions. BUSINESS costs $99 per month and adds digital estimate approval, proposal open tracking, unlimited takeoff and reports, and IFC import for BIM connections. This gives solo users and small teams a way to begin without payment, then add collaboration and document features as requirements grow.
Takeoff is the product’s central workflow: measured duct runs and counted components feed editable HVAC assemblies, where labor, productivity quantities, equipment costs, and material costs can be updated. AI can suggest HVAC line items and generate line-item cost breakdowns. The web-only deployment keeps access browser-based, while IFC/BIM import is the listed ecosystem connection. Teams needing broader integrations, native desktop access, or more generous takeoff allowances on entry plans may prefer another tool; HVAC-focused teams seeking low-cost estimating and proposal output are the clearest fit.
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OneEstimate pricing
All 4 OneEstimate plans and prices →
OneEstimate fact sheet
| Free plan | Yes |
|---|---|
| Paid from | $19/mo |
| HVAC cost database | Yes |
| Labor-rate database | Yes |
| HVAC takeoff tools | Yes |
| Proposal builder | Yes |
| Job costing | Not verified |
| Mobile apps | Not verified |
| QuickBooks sync | Not verified |
| Deployment | Cloud |
| Platforms | Web |
| Built for | Solo, Small business, Mid-market (editorial estimate) |
| Integrations | 1 integrations: IFC / BIM import |
| Pricing | Free plan (source) |
| Website | oneestimate.ai |
| Facts checked | 24 Sep 2026 |
OneEstimate integrations
OneEstimate lists 1 integrations on its own site.
- IFC / BIM import
Alternatives to OneEstimate
- Trimble AutoBid MechanicalSpecification-focused takeoffs, assemblies, fittings and labor units for mechanical bid teams.9.1
- McCormick SystemsA trade-focused estimating suite for MEP contractors working from PDF plans.8.3
- STACKBroad digital takeoff and estimating for HVAC teams that need construction-wide workflows.7.8
See all OneEstimate alternatives →
OneEstimate vs the competition
- OneEstimate vs Trimble AutoBid Mechanical
- OneEstimate vs McCormick Systems
- OneEstimate vs STACK
- OneEstimate vs CavSoft Evolution
- OneEstimate vs QuoteSoft
- OneEstimate vs ComfortQuote Pro
Compare OneEstimate with any tool side by side →
Also Ranked In
OneEstimate is ranked in 2 of our directories.
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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
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