Change Orders in Design-Build: How to Avoid Them

A change order is a formal modification to a construction contract — a written agreement between the homeowner and the contractor that changes the scope, cost, or timeline of the project after the original contract is signed. Change orders are one of the most common sources of conflict in residential construction, and the design-build delivery model handles them fundamentally differently than the traditional architect-plus-contractor model. At Timber Design + Build, we have a defined change order process that protects both the client and the project.

Why Change Orders Happen

Change orders have three primary causes, and understanding them helps you anticipate which ones are avoidable and which ones are inherent to the nature of construction work.

Discovered conditions. This is the most common cause in renovation projects. When you open a wall in an 1890s Victorian in Kingston or a 1960s ranch in Poughkeepsie, you may find conditions that weren't visible during preconstruction: knob-and-tube wiring behind plaster, a rotted sill plate, galvanized plumbing concealed in a wall cavity, or a load-bearing header that's undersized for the span. These conditions require additional work that wasn't in the original scope. They are not errors — they are the reality of working in existing buildings.

Client-initiated scope changes. The homeowner decides during construction to upgrade a material, add a feature, expand the scope, or change a design element. A client might see the kitchen framing open and realize they want to extend the island by two feet, or they might decide mid-project that the primary bathroom should have heated floors. These are legitimate changes, but they need to be formally documented with cost and timeline impact before the work proceeds.

Design errors or omissions. The construction drawings didn't account for a condition, didn't specify a detail, or specified something that can't be built as drawn. In the traditional model — separate architect and contractor — this is the most contentious category, because it triggers a dispute about whether the error was the architect's or the contractor's responsibility. In design-build, this category largely doesn't exist, because the design team and the construction team are the same firm.

How Design-Build Reduces Change Orders

The fundamental advantage of design-build over the traditional model is that the designer and the builder collaborate throughout the design phase. The builder reviews every design decision for constructability, cost accuracy, and code compliance before the construction contract is signed. This eliminates most design-error change orders and significantly reduces the scope-gap change orders that result from drawings that don't fully account for construction reality.

At Timber, our eight-phase design-build process includes multiple budget validation checkpoints. The construction budget is developed alongside the design, not after it. By the time the construction contract is signed, the budget has been reviewed, refined, and validated against the actual design — not estimated from preliminary drawings.

Our Chief Architect 3D rendering process further reduces change orders by showing clients exactly what the finished space will look like before construction begins. When a client can walk through a photorealistic 3D model of their kitchen, they make design decisions with confidence — which means fewer mid-project changes driven by uncertainty about how the design will actually look and feel.

Timber's Change Order Process

When a change order is required — whether from discovered conditions, a client request, or a code requirement — we follow a defined process:

Step 1: Document the condition. For discovered conditions, we photograph and document what was found. The client sees the same documentation the construction team sees — no surprises, no obscure language.

Step 2: Present the options. We present the change with its cost impact, timeline impact, and any design implications. If there are multiple approaches (there often are), we present all of them with the trade-offs.

Step 3: Written approval before work proceeds. No change order work begins until the client has reviewed the scope and cost and provided written approval. This protects both parties — the client knows exactly what they're agreeing to, and the construction team has clear authorization to proceed.

Step 4: Budget tracking. Every approved change order is added to a running project budget that the client can review at any time. The total project cost — original contract plus all change orders — is always visible and current.

The Role of Contingency

A properly structured design-build budget includes a contingency line — typically 10–15% for whole-house renovations and 5–10% for new construction. This contingency is the client's budget reserve for change orders that result from discovered conditions. It is not a slush fund — it's a financial acknowledgment that working in existing buildings involves unknowns that can't be fully assessed until demolition exposes them.

The contingency line appears in the original construction contract. If the contingency isn't fully used, the client keeps the difference. If the contingency is exceeded, additional change orders follow the same documentation and approval process. The goal is that contingency covers the unknowns and the project comes in at or under the contract-plus-contingency total.

Change Orders in the Hudson Valley Context

The Hudson Valley's housing stock — from 18th-century stone houses in Stone Ridge to Victorians in Beacon to Catskill Mountain cabins in Phoenicia — means discovered conditions are a regular part of renovation work. Common change-order-triggering discoveries in our market include:

Knob-and-tube wiring behind plaster walls that wasn't visible during preconstruction. Rotted sill plates from decades of inadequate drainage — common in mountain properties in Woodstock and Kerhonkson. Undersized headers on load-bearing walls that need reinforcement before an opening can be widened. Galvanized plumbing concealed in wall cavities. Framing that's been modified by previous owners without proper engineering. Each of these is a legitimate discovered condition that requires a change order — and each follows our documented process.

Red Flags: Change Orders That Signal Problems

Not all change orders are legitimate. Some signal problems with the contractor's initial estimate or process. Watch for these patterns when evaluating a design-build firm:

Change orders for items that should have been in the original scope. If the contractor submits a change order for work that a competent builder would have anticipated during preconstruction — standard code requirements, obvious structural conditions, mechanical system upgrades that are always required in homes of that age — the original estimate was intentionally low to win the contract.

Verbal change orders. Any contractor who tells you "we'll figure out the cost later" or "don't worry about it, we'll settle up at the end" is not managing the project professionally. Every change order should be written, priced, and approved before work begins.

Change orders with vague pricing. A change order should include specific material costs, labor hours, and a clear scope description. "Structural work — $15,000" is not a legitimate change order. "Sister floor joists in master bedroom (12 joists, 2x10x14 LVL, 16 labor hours at $XX/hour) — $X,XXX" is.

How to Protect Yourself as a Homeowner

Start with thorough preconstruction. The most effective way to minimize change orders is to assess the existing structure thoroughly before the construction contract is signed. Open exploratory areas where conditions are unknown. Inspect the foundation, the framing, the electrical panel, the plumbing, and the roof structure. The more you know before construction begins, the fewer surprises you'll encounter during it. Our preconstruction process is designed specifically for this purpose.

Budget realistic contingency. If a contractor tells you the renovation will cost exactly $X with no contingency, they're either underestimating deliberately or they don't have enough experience in older homes to know what they'll find. A 10–15% contingency on a whole-house renovation is realistic and responsible budgeting, not a mark of uncertainty.

Insist on written change orders. Every change to scope, cost, or timeline should be documented in writing and signed by both parties before work proceeds. This is not adversarial — it's professional. It protects the homeowner and the contractor equally.

Review the running budget regularly. Ask your contractor for a current budget that includes the original contract amount plus all approved change orders. If the contractor can't produce this document, the project finances are not being managed properly.

Frequently Asked Questions

What percentage of a renovation budget typically goes to change orders?

In a well-managed design-build project, change orders from discovered conditions typically consume 5–10% of the original contract value. The contingency line — typically 10–15% of the contract — is sized to cover this range. Client-initiated changes (upgrades, scope additions) are separate from discovered conditions and are funded separately. The goal is that the total project cost falls within the contract-plus-contingency range.

Can I refuse a change order?

You can decline a client-initiated change order (your own request to upgrade or change something). For discovered conditions — structural issues, code requirements, safety hazards — you generally cannot decline the work, because the condition needs to be addressed before construction can proceed safely and legally. You can, however, discuss the approach and choose among options if multiple solutions exist.

How does Timber's change order process differ from a traditional GC?

In the traditional model, a change order often triggers a three-way negotiation between homeowner, architect, and contractor about whose responsibility the issue is. In our design-build model, there is no finger-pointing — we own both the design and the construction. When a change is needed, we document it, present the options and costs, get written approval, and proceed. The process is simpler, faster, and less adversarial.

Should I budget for change orders on a new construction project?

Yes, though the contingency percentage is lower — typically 5–10% for new construction versus 10–15% for renovation. New construction has fewer discovered conditions (you're not opening walls with unknown contents), but client-initiated changes still occur. Site conditions can also produce surprises — rock excavation, unexpected water table levels, or soil conditions that differ from the geotechnical report. See our guide on renovation vs. new construction for more on this comparison.

More in this series: What Is Design-Build? · Design-Build vs. GC · The Timber Process · 3D Renderings · Cost Structure · Evaluating Firms · Renovation vs. New