---
title: "Gantt Chart for Interior Design: How to Plan a Project"
date: 2026-10-22
lang: en
url: https://archiboard.design/blog/gantt-chart-interior-design-project-plan
---

# Gantt Chart for Interior Design: How to Plan a Project

A Gantt chart for interior design is a timeline where every construction phase, order, delivery and installation sits on one scale, linked by dependencies. To build one, list the phases, estimate their duration in working days, link the phases that depend on each other, and then work backwards from the installation dates to find when each item must be approved and ordered. The procurement layer is what separates a useful interior schedule from a generic construction plan.

## What a Gantt chart must show in an interior project

A contractor's Gantt chart usually stops at trades: demolition, electrical, plastering, finishing. A designer's chart has to answer a different question: *what could stop the work on site, and when do I need to act to prevent it?* For that, the chart needs more than trades.

### Three layers on one chart

- **Construction phases.** Bars with start, finish and duration in working days.
- **Procurement.** For each long-lead item: approval, order, production or waiting time, delivery, acceptance.
- **Decisions and checks.** Client approvals, measurements, payments to suppliers, on-site acceptance.

### What does not belong on it

Do not put every small task on the chart. Small tasks such as “send the moodboard” or “call the plumber” belong on a task board. The Gantt chart should stay readable: if you cannot see the whole project on one or two screens, you have too much detail.

## How to build the chart step by step

1. **List the phases in the real order of work.** Typical sequence: demolition, rough plumbing and electrical, walls and screed, tiling, ceilings and painting, flooring, installation of built-in furniture, lighting, loose furniture and decor. Add or remove phases to match your project.
2. **Estimate each duration in working days, not calendar days.** Weekends and public holidays then do not distort the chart. Ask the contractor for their numbers and add your own review time.
3. **Link the phases that depend on each other.** Tiling cannot start before screed has cured; painting cannot start before dust-producing work is finished. A link can carry an offset, for example “start 3 days after the previous phase ends” for drying time. When one phase moves, the dependent ones should move with it.
4. **Attach items to the phases where they are installed.** Tiles belong to the tiling phase, pendant lights to the electrical or final installation phase, built-in furniture to its own installation phase.
5. **Add the lead time for each item.** Delivery or production time, plus a buffer (see the next section).
6. **Add milestones.** Mark client approval dates, measurements and the date by which everything for the next phase must be on site.
7. **Review the critical path.** Find the chain of phases and orders where any delay moves the final date. Give that chain the most attention.

### Example phase plan

The numbers below are an illustrative example for a mid-size apartment renovation, not a standard to copy.

| Phase | Duration (working days) | Depends on | Must be on site before start |
| --- | --- | --- | --- |
| Demolition | 5 | Start of project | Skips, protection materials |
| Rough electrical and plumbing | 10 | Demolition | Cable, pipes, boxes |
| Walls and screed | 12 | Rough electrical and plumbing | Plaster, screed mix |
| Tiling | 10 | Walls and screed (+ drying offset) | Tiles, adhesive, trims |
| Painting | 8 | Tiling | Paint, wallpaper |
| Flooring | 5 | Painting | Parquet or other flooring |
| Built-in furniture and doors | 6 | Flooring | Kitchen, wardrobes, interior doors |
| Lighting and decor | 3 | Built-in furniture and doors | Fixtures, curtains, accessories |

## Plan procurement backwards from the installation date

This is the step most schedules skip. Do not ask “when can we order?” Ask “when is the latest day we can order without delaying the phase?”

1. Take the day the item must be on site, which is the start of the phase that uses it.
2. Subtract the supplier's delivery or production time.
3. Subtract a buffer for delays, usually longer for imported or made-to-order items.
4. The result is the **order-by date**.
5. Subtract the time you need to get the client's approval and prepare the order. The result is the **approve-by date**.
6. For items that need site measurements (built-in furniture, windows, doors), place the measurement before the approval date.

### Worked example

Day 0 is the project start. All numbers are working days and are an illustrative example.

| Item | Needed on site (day) | Lead time | Buffer | Order by (day) | Approve by (day) |
| --- | --- | --- | --- | --- | --- |
| Floor tiles | 32 | 20 | 5 | 7 | 4 |
| Interior doors (measured) | 50 | 25 | 5 | 20 | 17 |
| Pendant lights | 55 | 10 | 5 | 40 | 37 |
| Built-in kitchen (measured) | 60 | 30 | 5 | 25 | 22 |

Look at the tiles: they must be approved on day 4, when the project has barely started. A chart that shows only trades would put this decision weeks later and the tiling phase would stall. The kitchen shows the same effect from another angle. It is installed on day 60, but the decisions that shape the whole schedule are made around day 22.

### Sort items by order date, not by room

The estimate is usually organised by room. For scheduling, re-sort the same items by order-by date. The list at the top is what you must chase this week.

## Keep the chart alive during the project

A Gantt chart that is correct on day 1 and never updated is worse than none, because it gives false confidence. Update it on a fixed rhythm and react to the signals below.

### Signals that the chart needs a change

- A supplier moves a delivery date. Record the new date and the reason, then check which phase it touches.
- The planned delivery date has passed and the item has not arrived. Do not invent a new date; ask the supplier for a confirmed one.
- The client has not approved an item by its approve-by date. Either escalate or move the dependent phase.
- A trade finishes earlier or later than planned. Shift the linked phases.
- An item is replaced with an alternative that has a different lead time.

### Weekly review checklist

- Which approve-by dates fall in the next two weeks, and are those items approved?
- Which order-by dates fall in the next two weeks, and are those items ordered and paid?
- Which deliveries are overdue or have no confirmed date?
- Which items are due on site next week, and has someone checked their status?
- Did any phase finish earlier or later, and are dependent phases updated?
- Does the client see the same dates you work with?

## Common mistakes when planning with a Gantt chart

- **Calendar days instead of working days.** Durations look shorter than they are, and the schedule slips by weeks over the project.
- **No links between phases.** Without dependencies, one delay does not move anything and the chart quietly becomes wrong.
- **Procurement kept in a separate file.** If orders and phases are not on one scale, nobody sees that a delivery is later than the installation.
- **No buffer.** A promised delivery date is a supplier's estimate, not a guarantee. Add buffer to every long-lead item.
- **Forgetting measurements and drying times.** Both are invisible on the site but real on the chart.
- **Too much detail.** Dozens of one-day bars hide the critical path. Keep tasks on a task board.

## How to do it in ArchiBoard

The [procurement timeline](/features/procurement-timeline) puts construction phases, orders, deliveries and payments on one chart. Tasks are covered in the [help chapter on tasks](/help/tasks). The estimate that feeds the timeline is described on the [estimates page](/features/estimates).

1. Open the project and go to **Timeline**, then click **Add Phase**. Create phases such as “Electrical” and “Finishing”.
2. Enter the phase dates from the keyboard, or drag the bar by its edge. Duration is calculated in working days.
3. Link phases with an arrow when one cannot start without the other. Set an offset in days for the link if you need drying or waiting time. If a phase is moved, dependent phases shift automatically.
4. Check where the items from your estimate landed. They are placed into phases by category, for example lighting under electrical and tiles under finishing. To change this, drag the item to another phase or click **Move to phase…**. A manual link takes precedence over the automatic one.
5. Use **Expand all** and **Collapse all** to open or close the whole tree.
6. Read each item's bar: order, waiting, delivery, acceptance, payment to supplier, measurement, installation and actual dates. Segments marked with 🔒 are calculated from the estimate. To change them, edit the item, not the timeline.
7. Open the **Upcoming purchases** block to see what must be ordered first, sorted by order deadline.
8. Switch **Mode** to **Board** to manage tasks by status, or back to **Timeline** to see them on the Gantt chart. Use **Add task** for new ones.

If the planned delivery date has passed and the item has not arrived, the waiting bar extends to today. The system does not invent a new date; it creates the task “Request new delivery date”.

## FAQ

### How detailed should a Gantt chart for an interior project be?

Detailed enough to show phases, dependencies and long-lead items, but not every small action. A good test is whether you can read the whole project on one or two screens. Put small daily tasks on a separate task board and keep the chart for decisions that move dates.

### Is Excel enough for a Gantt chart in interior design?

Excel works for a simple project with few phases. It becomes hard to maintain when dates change, because linked phases do not move on their own and orders live in another sheet. If you reschedule often or manage many items with different lead times, a tool with dependencies and procurement on one timeline saves time.

### How do I handle a supplier who keeps rescheduling delivery?

Record each new date with its reason, so you can see the pattern. Check which phase the item blocks and decide early: wait, switch to an alternative with a shorter lead time, or change the phase order. Use this history when choosing suppliers for the next project.

### Should the client see the Gantt chart?

Yes, in a simplified form. Clients need phases, key approval dates and expected deliveries, not internal margins or every dependency. Showing approve-by dates helps them understand why a decision cannot wait, because a late approval has a visible effect on the schedule.

### How much buffer should I add to delivery times?

There is no universal figure. Use less for in-stock local items and more for imported or made-to-order ones. Base it on your own history with the supplier: if their dates often slip by a week, add at least that much. Increase the buffer for items on the critical path.

### When should I start building the chart?

Start when the concept and the first version of the estimate are ready, before the contractor starts work. Many approve-by dates fall in the first weeks, so a chart made after demolition is already late for the items with the longest lead times.