DateSpan @ Durationly.com logo
Free construction calculators

Construction Toolkit

Date calculators built for construction professionals — project timelines, concrete cure milestones, and permit tracking, all in one place.

📋Planning tool disclaimer: Results are general planning estimates and should not be considered engineering, architectural, legal, permitting, inspection, or construction advice. Always verify project requirements against applicable plans, specifications, manufacturer instructions, building codes, permit requirements, and direction from qualified professionals or the appropriate Authority Having Jurisdiction (AHJ).

Project Timeline

Project phases

days
days
days
days
days
days
days
days
days

Timeline results are planning estimates and do not guarantee actual project completion dates.

Start date
Sep 13, 2026
Completion date
Dec 24, 2026
Total calendar days
102
Phases
9
Timeline
Preconstruction / PermittingSep 13 – Sep 25, 2026 · 12d cal / 9d work
Mobilization & Site PreparationSep 25 – Oct 2, 2026 · 7d cal / 5d work
Excavation & FoundationOct 2 – Oct 16, 2026 · 14d cal / 9d work
FramingOct 16 – Oct 30, 2026 · 14d cal / 10d work
Rough-In (Electrical, Plumbing, HVAC)Oct 30 – Nov 16, 2026 · 17d cal / 10d work
Inspections & ApprovalsNov 16 – Nov 23, 2026 · 7d cal / 5d work
Insulation & DrywallNov 23 – Dec 3, 2026 · 10d cal / 7d work
Interior FinishesDec 3 – Dec 17, 2026 · 14d cal / 10d work
Punch List & Final InspectionDec 17 – Dec 24, 2026 · 7d cal / 5d work
PhaseStartEndCal. daysWork days
Preconstruction / PermittingSep 13, 2026Sep 25, 2026129
Mobilization & Site PreparationSep 25, 2026Oct 2, 202675
Excavation & FoundationOct 2, 2026Oct 16, 2026149
FramingOct 16, 2026Oct 30, 20261410
Rough-In (Electrical, Plumbing, HVAC)Oct 30, 2026Nov 16, 20261710
Inspections & ApprovalsNov 16, 2026Nov 23, 202675
Insulation & DrywallNov 23, 2026Dec 3, 2026107
Interior FinishesDec 3, 2026Dec 17, 20261410
Punch List & Final InspectionDec 17, 2026Dec 24, 202675

Scheduling reminder: Some construction activities cannot begin until preceding work, inspections, approvals, material deliveries, or required curing periods are complete. This tool does not determine construction sequencing — verify phase dependencies with your project team and applicable professionals.

Frequently asked questions

How does the construction project timeline calculator work?

Enter your project start date and define each phase with a name and duration. Toggle "workdays only" per phase to skip weekends and holidays. The calculator generates start/end dates for every phase and renders a Gantt-style bar chart with a CSV export.

How long does concrete take to cure?

Concrete curing timelines are general planning estimates — not guaranteed strength or load-bearing determinations. Common reference milestones for standard Portland cement concrete include approximately 24–48 hours for early foot traffic under suitable conditions, 7 days as a general intermediate reference, and 28 days as a common reference age for specified compressive strength. Actual strength development depends on mix design, temperature, curing conditions, cement type, admixtures, moisture, slab thickness, and required strength. Always follow project specifications and applicable testing requirements when determining whether concrete is ready for a particular load or construction activity.

How long is a building permit valid?

Permit validity periods vary by jurisdiction and permit type — local rules control. Common reference periods used for planning purposes are 12 months for building permits and 6 months for electrical, plumbing, and mechanical permits, but these are general defaults only. Use the permit scheduler as a planning aid and verify the actual expiration, renewal, and inspection requirements with the applicable permitting authority.

Are these construction calculators free?

Yes, completely free. All calculations run in your browser — no account, no subscription, no data sent to any server.