SubShieldHQ
Transparent Subcontractor Math & Compliance

Bid With Confidence. Protect Your Margin & Cash Flow.

An open-access estimating & payment protection suite for trade contractors. Factor in true labor burden, recover overhead, generate lien waivers, and verify statutory notice cutoffs across all 50 states.

Open Bid EstimatorCheck State Deadlines

01. Direct Cost & Margin Calculator

All calculations run client-side in your browser. Your rates never leave your device.

Calculate Exact Burden % →
Base field hourly or trade labor
FICA, FUTA, SUTA, workers' comp & benefits
Shop, truck, insurance, software costs
Target gross profit share of final contract

Bid Price Breakdown

Burdened Labor:$3,200.00
Direct Cost Total:$7,000.00
Overhead Added:$1,050.00
Break-Even Cost:$8,050.00
Projected Net Profit:+$2,012.50
Recommended Bid Price
$10,062.50

Formula: Break-Even Cost ÷ (1 - Margin%). See why markup ≠ margin.

02. Mechanics Lien & Notice Calendar Estimator

Look up statutory preliminary notice and lien filing windows across all 50 states + D.C. and export calendar alerts (.ics).

Open Full South Carolina Statutory Guide →
Select where project work is located
Used for first-furnishing notice triggers
Used for lien filing & post-work notice triggers
South Carolina Statute: Notice of Furnishing Labor or Materials (Title 29 Ch 5)Filing Window: 90 Days from Last Furnishing
Preliminary Notice Deadline
Not Statutorily Required

Must file mechanics lien within 90 days of last furnishing labor or materials.

Final Mechanics Lien Cutoff
Enter Last Work Date

Must be formally recorded in county land records before this date expires.

Legal Disclaimer: Mechanics lien laws vary by claimant tier, project type, and contract terms. Informational approximations only; not formal legal counsel.

Free Draw & Payout Document

Conditional & Unconditional Lien Waiver Generator

General Contractor asking for a lien waiver before releasing your progress draw or retainage? Generate a clean printable PDF waiver in 30 seconds without accidentally signing away unpaid rights.

Create Lien Waiver PDF →
Overdue Invoice Collection

Notice of Intent to Lien (NOI) Demand Generator

Invoice 45+ days past due? Generate a formal Certified Mail Notice of Intent to File a Mechanics Lien pre-loaded with your state's exact statutory citation to trigger fast payout.

Create Notice of Intent →
Free Download • Excel & Google Sheets

Subcontractor Bid & Labor Burden Spreadsheet

Take our exact estimating formulas offline. Includes a pre-built Labor Burden Calculator, Overhead Recovery Matrix, Materials Takeoff, and Change Order Log ready for Google Sheets or Excel.

Get Free Bid Template →
SubShield Pro • $19/month

Automated SMS & Email Lien Deadline Alerts

Never forfeit an unpaid invoice over a missed notice window. Track up to 30 active jobs across all 50 states with automatic SMS & email countdown alarms sent 14, 7, and 2 days before statutory cutoffs.

Cancel anytime • Instant setup

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Mechanics Lien & Preliminary Notice Deadlines by State (All 50 States + D.C.)

Alabama (AL)Alaska (AK)Arizona (AZ)Arkansas (AR)California (CA)Colorado (CO)Connecticut (CT)Delaware (DE)District of Columbia (DC)Florida (FL)Georgia (GA)Hawaii (HI)Idaho (ID)Illinois (IL)Indiana (IN)Iowa (IA)Kansas (KS)Kentucky (KY)Louisiana (LA)Maine (ME)Maryland (MD)Massachusetts (MA)Michigan (MI)Minnesota (MN)Mississippi (MS)Missouri (MO)Montana (MT)Nebraska (NE)Nevada (NV)New Hampshire (NH)New Jersey (NJ)New Mexico (NM)New York (NY)North Carolina (NC)North Dakota (ND)Ohio (OH)Oklahoma (OK)Oregon (OR)Pennsylvania (PA)Rhode Island (RI)South Carolina (SC)South Dakota (SD)Tennessee (TN)Texas (TX)Utah (UT)Vermont (VT)Virginia (VA)Washington (WA)West Virginia (WV)Wisconsin (WI)Wyoming (WY)