How a Construction Budget and Change Orders Work

Money is the part of a construction project that causes the most stress, and most of that stress comes from not knowing how the pieces fit together. This guide explains how a construction budget is built, what happens when it changes, and what to look for in your contract.

What’s in a construction budget

A typical project budget includes more than the contractor’s price.

Design and engineering. Architect, designer, structural engineer, and any specialty consultants.
Permits and fees. City plan review, permit fees, and sometimes utility or school fees.
Construction. Labor, materials, subcontractors, and the contractor’s overhead and profit.
Selections. Fixtures, appliances, tile, and finishes, which may be inside or outside the contract price.
Contingency. Money set aside for the unexpected.
Living costs. Temporary housing and storage, if you need to move out.

When comparing bids, make sure each one covers the same items. Two numbers that look different may simply include different things.

Three common contract types

Fixed price

You and the contractor agree on a total price for a defined scope. It gives you cost certainty, as long as the scope is clearly written and the plans are complete. Changes are handled with change orders.

Cost-plus

You pay the actual cost of labor and materials plus a fee or percentage. This offers transparency and flexibility, but needs good tracking and communication, since the final number isn’t fixed in advance.

Unit pricing

Certain items are priced per unit, such as per square foot of flooring or per linear foot of a retaining wall. This is useful when quantities are uncertain.

Each can work well. What matters is that you understand which one you’re signing and how it handles changes.

Allowances, explained

An allowance is a placeholder amount for something that hasn’t been selected yet, such as tile or lighting fixtures. If you pick something that costs more than the allowance, the difference is added. If it costs less, you get a credit.

Allowances are normal, but they deserve attention. Unrealistically low allowances make a bid look cheaper than it is. Ask how each allowance was set, and compare against the type of finishes you actually have in mind.

Contingency: your safety margin

Even the best plans can’t predict everything, particularly in older homes. Many contractors and advisors suggest holding a contingency reserve, commonly in the range of 10 to 20 percent for remodels of older homes, and less for new construction with clean sites.

The key rule: treat contingency as money you expect to spend, not a bonus. If you have some left at the end, great.

What a change order is

A change order is a written agreement to change the original scope, price, or schedule. It might be triggered by:

A homeowner request, such as upgrading a countertop or adding an outlet.
A hidden condition, such as rot discovered behind a wall.
A code or inspection requirement that wasn’t visible in the plans.
A design change from the architect or engineer.

A good change order includes a description of the work, the cost, and any effect on the schedule, and it is signed by both parties before the work happens.

What a good change-order process looks like

Written, every time. Verbal agreements lead to disputes.
Priced before work proceeds. You should see the number before it’s built.
Clear about time. Every change should state its schedule impact, even if the answer is none.
Tracked in one place. A running log of approved changes and the revised contract total.

If a contractor is vague about how changes are handled, treat that as a warning sign. We cover this and other questions in our guide to questions to ask before hiring a general contractor.

Payment schedules

Payments are usually tied to milestones rather than dates, such as completion of demolition, framing, or rough inspections. In California, home improvement contracts have rules about down payments and required contract language, so verify current requirements with the Contractors State License Board. Also ask about lien releases, which document that the contractor and subcontractors have been paid for work completed.

How to read your contract

Before you sign, make sure you can answer these:

What exactly is included, and what is not?
Which items are allowances, and how much is each?
How are changes priced and approved?
What are the payment milestones?
What is the schedule, and what happens if it slips?
How are hidden conditions handled?

If any of these are unclear, ask for it in writing before you sign.

The takeaway

A budget is a plan, not a prediction. The goal isn’t to avoid every change, but to make sure every change is visible, priced, and approved before it happens. If you’d like to see how we handle estimates and changes on a project of your own, get in touch.