Garage Door Service input evidence register
44 financial inputs with their assumptions, calculation bases and cited sources.
Read the supported claim, observation period, geography and units together. A source access date records when it was consulted. A model assumption identifies a selected amount or target; a calculated result follows from those inputs and does not establish observed demand or a quoted opening budget.
Case updated October 4, 2026. These notes accompany the complete case methodology and source register.
Dataset use notice: no Creative Commons license or DOI is asserted. Referenced material remains subject to its publisher’s terms.
These notes explain the opening budget, annual forecast and calculator assumptions. Linked sources provide the support described in each note; they do not necessarily confirm the selected amounts. Check scenario assumptions against local quotes and operating records.
- Model assumption
Applies to: Total opening budget · Lower opening budget · Upper opening budget · Two staged used service vans and storage upfits · Door, spring, opener and diagnostic tools · Opening parts, hardware and controlled storage · Safety, access and site-protection equipment · Licenses, training, insurance, bonds and deposits · Software, website, marketing and administration · Working-capital reserve
Authored staged two-van opening allocation. Current new-van, retail-opener, startup-cost and classification sources inform categories but do not verify used vehicles, complete tools, inventory, compliance cost or reserve.
- Model assumption
Applies to: Revenue (Years 1–5)
Authored completed-job path. Year three is 4 jobs × $475 × 5 days × 50 weeks. Official and consumer sources establish context but not local price, mix, conversion or completion.
- Model assumption
Applies to: Parts, hardware, payment fees, route fuel and sales-linked costs (Years 1–5)
Authored 28% pool for parts, hardware, payment fees, route fuel and sales-linked leakage. Replace it with purchase, return, warranty, credit and callback records.
- Model assumption
Applies to: Paid owner-manager and garage-door technician payroll (Years 1–5)
Authored paid owner-manager and employee-technician schedule with employer-cost allowance. National occupation pay and federal payroll-tax guidance are context only.
- Model assumption
Applies to: Vehicles, insurance, tools, storage, software, marketing and overhead (Years 1–5)
Authored vehicle, insurance, tools, storage, software, marketing and administration schedule. It is not a local quote or dated cash forecast.
- Model assumption
Applies to: Retained sale per completed garage-door job (base scenario) · Retained sale per completed garage-door job (lower sensitivity) · Retained sale per completed garage-door job (upper sensitivity) · Route-wide completed jobs per field day (base scenario) · Route-wide completed jobs per field day (lower sensitivity) · Route-wide completed jobs per field day (upper sensitivity) · Trading days per week (base scenario) · Trading days per week (lower sensitivity) · Trading days per week (upper sensitivity) · Monthly fixed operating costs · Contribution margin · Opening sales as a share of mature volume · Monthly increase toward mature volume · Forecast horizon (months)
Authored completed-job break-even bridge. The $475 ticket, four jobs, 72% contribution, fixed cost and ramp must reconcile to service mix, paid hours, parts, return visits and collection.