A custom home schedule has three readers. The office needs to know when money goes out and comes in. The site needs to know which trade is coming next week. The client wants to know when they can move in. One Excel workbook can serve all three if it is built on working days and task links rather than dates typed by hand.
This guide covers how to break the build into phases and tasks, how to set durations and links, how to handle holidays and seasonal limits, and how to turn the result into a look-ahead for your trades and a one-page timeline for your client.
Why Excel, and why not dates typed by hand
Scheduling software is built for large projects with many crews. Most owner-led custom builders run one to five homes at a time and already live in Excel. A spreadsheet schedule works well at that scale, as long as one rule holds: no typed dates. Every start date should be calculated from the task before it. When framing slips four days, every task after it should move without anyone retyping a cell.
Step 1: Break the build into phases
Phases are the stages you report on and often the stages you bill on. A common set for a custom home:
- Pre-construction and permits
- Site work and services
- Foundation
- Framing
- Close-in: roofing, windows and doors
- Rough-ins
- Insulation, air barrier and drywall
- Interior finishes
- Exterior finishes and landscaping
- Fixtures, final connections and commissioning
- Inspections, cleaning and PDI
- Deficiencies and final completion
Inside each phase, list tasks at the level a trade is booked. "Plumbing rough-in" is a task. "Run the vent stack" is too detailed for the master schedule. A full custom home schedule typically lands somewhere between 80 and 150 tasks.
Step 2: Durations in working days
Give every task a duration in working days, based on crew size and your own past jobs. Calendar days hide weekends and holidays and make every date wrong by a few days. Excel's WORKDAY.INTL function takes a start date, a number of working days and a list of holidays, and returns the finish date. Put your holidays and planned shutdowns on their own sheet and point every formula at it.
Step 3: Link tasks with predecessors
Each task should name the task or tasks that must finish before it starts. Most links in residential work are finish-to-start: drywall starts when insulation and the insulation inspection are done. Add a lag where something has to cure or be inspected, such as concrete before backfill. The start date is then the next working day after the latest predecessor finishes, plus any lag.
Some tasks also need a start-no-earlier-than date: material that cannot arrive before a set week, or a trade booked on a set day.
Step 4: Seasonal windows
Weather is the biggest scheduling risk on many sites. Frost, spring road load restrictions, freeze-up and open water for barge access all set dates that no amount of planning will move. Put each window on a settings sheet with editable dates, then mark the tasks it affects: either "avoid this window" or "only within this window". A footing pour can avoid the frost window. A barge delivery can run only while the water is open. The schedule then pushes the task to the first allowed working day on its own.
Step 5: Baseline, then track
When the client signs, copy the planned dates into baseline columns and leave them alone. Enter actual start and finish dates as work happens. Forecast dates come from the actuals and the remaining links, and the difference from baseline tells you, phase by phase, where the job is gaining or losing time.
Sample schedule extract
The sample below is an extract from a sample schedule, with sample durations. It is not a recommended duration for any task on your jobs.
| ID | Task | Phase | Days | Predecessor | Lag | Start | Finish |
|---|---|---|---|---|---|---|---|
| 21 | Footings formed and poured | Foundation | 4 | 20 | 0 | Mon May 4 | Thu May 7 |
| 22 | Foundation walls formed and poured | Foundation | 6 | 21 | 2 | Tue May 12 | Wed May 20 |
| 23 | Dampproofing and weeping tile | Foundation | 2 | 22 | 3 | Tue May 26 | Wed May 27 |
| 24 | Backfill | Foundation | 2 | 23 | 0 | Thu May 28 | Fri May 29 |
| 30 | Floor system framed | Framing | 5 | 24 | 0 | Mon Jun 1 | Fri Jun 5 |
| 31 | Walls and roof framed | Framing | 15 | 30 | 0 | Mon Jun 8 | Fri Jun 26 |
The extract uses 2026 dates and assumes Monday to Friday working days and a sample holiday on Monday May 18, which is why task 22 finishes on the Wednesday. Change one duration and every date below it moves.
Step 6: Views for the site and the client
The full schedule is for the office. Two printed views do most of the daily work:
- A two-week look-ahead. Every task active in the next ten working days, by trade, with weekends and holidays shaded. Send it to your trades every Friday.
- A one-page client timeline. Phases by month and the dates the client cares about: selections deadlines, walk-throughs and the move-in window. Keep it simple and update it monthly.
If your draws are tied to milestones, add a column for the draw each task belongs to, and the schedule will forecast your draw dates as well. See our guide to construction draw schedules.
A short how-to
- List phases, then tasks at the level a trade is booked.
- Give each task a duration in working days.
- Add predecessors and lags; type no dates except the project start.
- Add holidays and seasonal windows on their own sheets.
- Check the critical tasks and the forecast finish.
- Save a baseline when the contract is signed.
- Print the look-ahead weekly and the client timeline monthly.
The template
Our Custom Home & Cottage Construction Schedule (CA$59) is an Excel workbook built this way. It has 150 task rows with working-day durations, up to two predecessors per task, lag and start-no-earlier-than dates, editable seasonal windows, a weekly Gantt chart, a ten-working-day look-ahead, a one-page client timeline, progress tracking against baseline and forecast dates for 12 draws. The example copy carries 121 tasks in 12 phases. Standard formulas, no macros.
Before you schedule the build, set the budget it has to meet. The free Custom Home Cost Breakdown Template lays out a budget by division with actual cost and variance.
FAQ
How long does it take to build a custom home?
It depends on size, design, site, season and how fast selections are made. Many custom homes take 10 to 18 months from permit to move-in. Build your own durations from your past jobs.
Which versions of Excel does the schedule work in?
Excel 2016 and later, Excel for Mac and Excel for the web. It uses standard formulas only, with no macros.
What is a look-ahead schedule?
A short view, usually two or three weeks, of the tasks starting or running soon. It is the schedule your trades read.
Should I give the client the full schedule?
Most builders share a one-page timeline instead. The full schedule changes weekly and invites questions about every task.
What is the critical path?
The chain of linked tasks that sets the finish date. A delay on any of them delays completion unless you recover time later.