At a glance
A viable boutique firm needs roughly $172,000 before launch
This Washington statewide planning model assumes an independent, owner-operated professional LLC: one Washington-licensed civil PE founder, one full-time project engineer, one 0.6-FTE CAD/administrative technician, a small leased office, and no field-testing laboratory. At Typical scope, plan on $172,000 of total project cash, 10 – 16 weeks to open, and stabilized Base revenue of $53,200 per month. The model produces $10,250 monthly normalized passive-owner cash operating profit before D&A and $25,050 of working-owner pre-tax business cash benefit. The critical caveat is utilization: one delayed anchor contract can erase the passive return even while the working founder still earns compensation for labor.
Startup scope
Reserve and receivables matter more than desks
Engineering is capital-light but cash-cycle-heavy. Payroll arrives before client collections, public work may pay slowly, and professional-liability coverage plus software are not optional substitutes for liquidity.
| Use of funds | Lean | Typical | Premium |
|---|---|---|---|
| Entity, licenses, contracts, accounting | $4,200 | $8,500 | $16,000 |
| Office deposit, setup, furniture | $3,500 | $15,000 | $42,000 |
| Workstations, plotter, survey/field kit | $8,000 | $25,000 | $58,000 |
| Software onboarding and first-year prepaids | $7,500 | $18,000 | $31,000 |
| Insurance deposits and risk review | $5,800 | $11,500 | $22,000 |
| Pre-opening payroll, recruiting, marketing | $6,000 | $18,000 | $38,000 |
| Initial net working capital, excluding prepaids above | $8,000 | $23,000 | $45,000 |
| Opening operating-cash reserve | $28,000 | $58,000 | $86,000 |
| Contingency on non-reserve uses | $5,000 | $13,000 | $18,000 |
| Total project cash / founder equity, no debt | $76,000 | $172,000 | $356,000 |
The Lean scope is founder-only, remote-first and supported by subcontract drafting. Typical is the comparable base configuration. Premium adds space and equipment for a faster hiring ramp; it does not guarantee Upside demand. No debt, grant, landlord allowance, or equipment financing is assumed, so founder cash equals total project cash. Peak interim cash is also $172,000 because no reimbursement is modeled.
Regulatory path
The license sequence starts with the entity and ends with authority to offer services
The model uses a Washington professional limited liability company. Under WAC 196-25-005, PLLCs are exempt from a firm certificate of authorization; ordinary LLCs and corporations offering engineering must obtain one. The responsible engineer still needs active Washington registration, and all issued engineering documents must be under appropriate responsible charge and sealed where required.
| Gate | Authority | Fee basis | Timing | Dependency / evidence |
|---|---|---|---|---|
| Confirm founder's WA PE registration and entity naming | BRPELS | Renewal $128 / 2 years | Before marketing regulated services | Individual registration; exact scope and discipline |
| Form Washington PLLC | Secretary of State | $180 filing; $70 annual report | 7 – 10 business days standard | Name, registered agent, governors |
| Obtain EIN and banking | IRS / bank | No IRS fee | Often same day online; bank varies | Entity formed |
| File Business License Application | WA Department of Revenue | $50 opening fee + endorsements | About 10 business days; endorsements can add 2 – 3 weeks | UBI, tax accounts, employer registration |
| Confirm PLLC exemption or obtain firm COA | BRPELS | PLLC: exempt; ordinary LLC/corp COA $150, then $121/year | Not published | Entity and DOR registration precede COA |
| Bind E&O, general liability, cyber, workers' comp | Insurers / L&I | Local quote required | 2 – 4 weeks modeled | Client limits and contract terms |
| Office, city endorsement, home-occupation/zoning checks | City/county | Varies by city/county | 1 – 6 weeks modeled | Exact address; lease contingency |
| Contracts, QA/QC, software, payroll and soft launch | Counsel / vendors / employer agencies | Modeled in startup uses | 3 – 6 weeks; parallel | Insurance, licensing, secure document controls |
The 10 – 16 week overall launch range is a dependency model, not the sum of every row. Entity formation, insurance quotes, software setup, template contracts and recruiting can overlap. The critical path usually runs through PE/entity compliance, client-required insurance, address approval and the first signed backlog. If the founder uses an ordinary LLC instead of the assumed PLLC, insert the BRPELS certificate-of-authorization gate and do not solicit engineering work until authority is confirmed.
Operating economics
Billable hours, realization and staffing create the margin
The natural revenue unit is a collected billable hour. Base pricing uses $225 for principal time, $165 for project-engineer time and $105 for technician time. Fixed-fee projects are converted back to realized hours after write-downs so the capacity model remains visible.
| Metric | Downside | Base | Upside |
|---|---|---|---|
| Monthly net revenue | $36,000 | $53,200 | $68,800 |
| Annual net revenue | $432,000 | $638,400 | $825,600 |
| Monthly billable hours | 174 | 238 | 292 |
| Utilization of 352 available hours | 49% | 68% | 83% |
| Variable cost, passive basis | $12,240 | $18,088 | $23,392 |
| Fixed cost incl. fixed owner replacement | $24,800 | $24,862 | $27,300 |
| Normalized passive cash operating profit | – $1,040 | $10,250 | $18,108 |
| Working-owner pre-tax business cash benefit | $13,160 | $25,050 | $33,808 |
The owner-income bridge is deliberate. Base owner-replacement labor totals $14,800 monthly: $7,400 variable technical production and $7,400 fixed sales, supervision and administration, including a modeled 18% payroll burden. It is fully included in the passive P&L. A working founder avoids that cost, so $10,250 residual passive profit plus $14,800 imputed labor value equals $25,050 of pre-tax business cash benefit. That sum is neither a guaranteed salary nor accounting net income.
| Cost | Monthly | % revenue |
|---|---|---|
| Employee wages and payroll burden | $15,800 | 29.7% |
| Owner replacement labor – variable | $7,400 | 13.9% |
| Owner replacement labor – fixed management | $7,400 | 13.9% |
| Subconsultants, reimbursables, card fees | $10,688 | 20.1% |
| Office occupancy and utilities | $2,700 | 5.1% |
| Software, cloud, telecom and security | $2,650 | 5.0% |
| E&O, GL, cyber and other insurance | $1,350 | 2.5% |
| Marketing, travel, professional fees, training | $2,262 | 4.3% |
| Washington B&O tax at 1.5% | $798 | 1.5% |
| Bad debt / write-off allowance | $902 | 1.7% |
| Total passive-basis cash operating cost | $42,950 | 80.7% |
Debt principal, interest, depreciation, income tax, maintenance capex and changes in net working capital are excluded from operating cost. The cash plan separately reserves $750 monthly for workstation/field-equipment replacement. Washington's 2026 minimum wage is $17.13, but skilled engineering pay – not the wage floor – drives recruiting. Paid sick leave accrues at least one hour per 40 hours worked, and workers' compensation and unemployment rates must be quoted to the assigned classifications.
Unit economics
One realized hour contributes $108 on a passive basis
Across the explicit Base mix, $53,200 divided by 238 billable hours gives $223.53 of revenue per realized hour. Variable cost is 34.0% of revenue, including variable owner-replacement labor; passive contribution is therefore $147.53 per hour before fixed costs. After isolating approximately $39.50 of pass-through revenue and matching pass-through cost per billable hour, the recurring professional-service contribution is approximately $108 per billed hour.
| Measure / formula | Result |
|---|---|
| Revenue per realized billable hour | $223.53 |
| Passive variable cost per hour | $76.00 |
| Passive contribution per hour | $147.53 |
| Passive contribution margin | 66.0% |
| Cash-survival break-even before owner compensation | $25,300 / 113 hr |
| Sustainable working-owner break-even incl. $14,800 target labor value | $36,600 / 164 hr |
| Passive-owner break-even incl. variable and fixed replacement labor | $36,600 / 164 hr |
| Passive break-even utilization of 352 available hours | 47% |
The passive break-even numerator is $24,156 of fixed monthly cash costs, including only the fixed $7,400 owner-management replacement line. The matching 66.0% contribution margin already includes variable owner technical replacement labor, so it is not counted twice. A debt-service break-even would add the actual monthly principal, interest and maintenance-capex requirement to the numerator; this unlevered model adds only the $750 maintenance reserve, lifting cash break-even to about $37,700.
Cash resilience
Base payback arrives in month 24 only if collections behave
The monthly unlevered project schedule starts at – $172,000, includes ramp cash flow, a $750 monthly maintenance-capex reserve after opening, and modeled receivables growth. Revenue ramps from 35% of stabilized Base in month 1 to 100% in month 7; collections average roughly 45 days.
Downside
Payback not reached within 60 months. Stabilized passive profit is slightly negative before maintenance capex. The opening reserve falls below the $15,000 minimum-cash floor in month 7, requiring pricing, staffing or new equity action.
Base
Unlevered project payback: month 24. The reserve bottoms near $21,000 during ramp, above the $15,000 floor. The simple stabilized ratio is 18 months, but it ignores ramp timing and is only a sanity check.
Upside
Unlevered project payback: month 15. This assumes backlog supports 83% utilization without an additional hire. A hire step-up would reduce near-term cash and require a new capacity tier.
Receivables are the main cash sensitivity. Extending average collection from 45 to 75 days adds roughly $53,000 of receivables at Base revenue and can consume most of the operating reserve even though earned-revenue profit is unchanged. Client deposits are modeled as deferred cash until work is earned, not as revenue or founder funding. The first-year cash requirement is the $172,000 initial project funding plus any actual later injection; Base requires none, while Downside requires roughly $35,000 – $55,000 to preserve the minimum floor through year one.
Statewide variation
Washington changes tax, wage and address risk – not the firm's identity
Washington has no general personal or corporate income tax, but gross-receipts B&O tax applies before profit. For a young firm below $1 million of prior-year Service & Other Activities income, the modeled rate is 1.5%; higher prior-year tiers became 1.75% and 2.1% from October 2025. The firm should confirm classification project by project because engineering connected to construction can cross into retailing or other treatment.
A reliable Washington engineering-services market-revenue amount is not publicly determinable from the reviewed category data without a custom Census extraction that cleanly handles employer/nonemployer overlap and disclosure suppression. Treat statewide engineering employment, establishment counts, public capital programs, permit volumes and private development pipelines as demand proxies – not market size. The firm's practical serviceable market is capacity-constrained: at Base, 238 billable hours per month and the displayed rates cap annual revenue near $638,400 unless the team, rates or pass-through mix changes.
| Market type | Office planning observation | Local gate | How to use it |
|---|---|---|---|
| Large metro example | Private-office quotes tend toward upper statewide range; exact lease quote required | City business license endorsement; zoning/home-occupation rules | High case for occupancy and wage recruitment |
| Mid-sized market example | Middle of observed flexible-office range; exact inclusions vary | City endorsement and address-specific use confirmation | Typical occupancy midpoint |
| Smaller / lower-cost example | Lower office cost, but potentially thinner specialist labor pool | City/county business and home-occupation checks | Lean occupancy boundary; not a statewide average |
The occupancy allowance is a modeled state basket rather than a claimed observed statewide average: small-office/flexible-space specifications were compared across a large, mid-sized and smaller Washington market, then rounded to a $2,700 Base monthly allowance including utilities. Listings change quickly, inclusions differ, and the final address needs a live quote. Local business endorsements, home-occupation rules, signage, tenant improvements and certificate-of-occupancy requirements vary by city/county. Confirm them before signing a noncontingent lease.
Rate risk
A 5% realized-rate reduction cuts Base monthly revenue about $2,660 and passive profit by roughly $1,760 after variable costs. Track realized rate by principal, engineer and technician.
Utilization risk
A 10-point utilization loss removes roughly 35 billable hours and about $7,800 of revenue at the blended rate. Track backlog coverage and nonbillable rework weekly.
Collection risk
Thirty extra collection days tie up about one month of revenue. Track DSO, unbilled work, aged receivables and contract payment terms before accepting backlog.
Sources and method
What is official, observed and modeled
Research was reviewed August 29, 2026; dollar assumptions use a 2026 planning basis. Official rules and fees are high-confidence inputs. Payroll, insurance, software, office costs, utilization, rates, ramp and collection timing are modeled planning assumptions that require quotes and client validation. The largest uncertainty is not the filing fee – it is the speed and quality of contracted backlog.
| Source / publisher | Geography / period | Evidence type | How used |
|---|---|---|---|
| Secretary of State filings | Washington; current | Official fee or rule | PLLC formation $180, annual report $70, initial-report timing |
| Department of Revenue licensing fees | Washington; current | Official fee or rule | $50 new-business application and $5 renewal processing fee |
| Business licensing FAQs | Washington; current | Official rule / timing | 10-business-day processing; endorsements may add 2 – 3 weeks |
| BRPELS firm authorization | Washington; current | Official rule | Ordinary firm sequence, UBI and designated-engineer requirements |
| WAC 196-25-005 | Washington; effective 2023 | Official rule | PLLC exemption from certificate of authorization |
| BRPELS fee schedule | Washington; 2025+ | Official fee | PE renewal and firm COA application/renewal fees |
| B&O classifications | Washington; 2026 | Official tax rate | 1.5% / 1.75% / 2.1% service tiers |
| Common business tax classifications | Washington; current | Official guidance | Engineering service and construction-related classification caution |
| Labor & Industries minimum wage | Washington; 2026 | Official rule | $17.13 statewide wage floor; local rates may be higher |
| Labor & Industries paid sick leave | Washington; current | Official rule | At least one hour accrued per 40 hours worked |
| Employment Security tax-rate method | Washington; 2026 | Official rule | New-employer rate is industry-assigned; quote required |
| Census NAICS 541330 profile | U.S.; 2023 | Reported government data | Industry definition and national establishment context; not used as Washington TAM |
Model calculations use unrounded internal values and display rounded results. Insurance, payroll burden, office basket, software, billing rates, billable capacity, write-offs and cash-collection timing are moderate-to-low confidence until replaced with binding quotes, signed contracts and payroll classifications. This is planning analysis, not legal, engineering-practice, insurance or tax advice. Confirm the exact entity, services, ownership, responsible-charge structure and operating address with BRPELS, the Department of Revenue, local authorities, counsel and an insurance broker before committing capital.