Recovery Schedules and Acceleration: Who Pays to Get a Late Project Back on Track?

Sooner or later, most construction projects fall behind. The monthly update shows negative float, the opening date is at risk, and someone asks for a recovery schedule. What happens next decides who pays for getting back on track. Owners who handle it well recover time at a fair price. Owners who handle it badly either pay for the contractor's delays or end up facing an acceleration claim they never saw coming.

This guide explains the difference between mitigation, recovery and acceleration, what a credible recovery schedule looks like, and how owners can avoid accidentally triggering a constructive acceleration claim.

Mitigation, recovery and acceleration

These words get used loosely, but they mean different things and carry different cost consequences. A 2025 FTI Consulting article on the subject draws the key distinctions:

• Mitigation is a contractor's measure to reduce or eliminate the effect of a delay, usually by resequencing work. It typically costs little.
• Acceleration means completing the contracted work faster than planned, usually with more resources, extra shifts or overtime. It costs real money.
• Directed acceleration happens when the owner explicitly instructs the contractor to speed up. It's generally compensable, though the parties may argue about how much.
• Constructive acceleration happens when the owner refuses a justified extension of time and insists on the original date, so the contractor speeds up to meet it. If the extension turns out to have been justified, the contractor may recover its acceleration costs.

A recovery schedule is the plan that shows how lost time will be made up. It can be built on mitigation, acceleration or both. Who pays depends on why the time was lost.

Who pays to recover lost time

The principle is simple, even if applying it isn't. FTI's article puts it this way: acceleration costs should be borne by the party responsible for the delay that made acceleration necessary.

• If the contractor caused the delay, the contractor generally has to recover at its own cost. Most contracts require the contractor to maintain progress and complete on time.
• If the owner caused the delay, or it was caused by an excusable event such as an owner change, the contractor is generally entitled to an extension. If the owner wants the original date anyway, it should expect to pay for acceleration.
• If both contributed, the answer depends on the contract and the facts, and it often becomes a concurrent delay argument.

The constructive acceleration trap

Constructive acceleration is the scenario owners most often stumble into without realizing. It usually goes like this. The contractor submits a request for an extension. The owner, under pressure to hold an opening date, doesn't respond, or responds with "we need you to hold the date." The contractor adds crews and overtime, writes a letter saying it's accelerating under protest, and submits a claim months later.

According to FTI, AACE International lists five elements for a constructive acceleration claim:

1. The contractor experienced an excusable delay.
2. The contractor requested an extension and established its entitlement.
3. The owner failed to grant a timely extension.
4. The owner ordered, or clearly implied, completion within the original period.
5. The contractor gave notice that it considered this an acceleration order.

The owner controls items three and four. A prompt, reasoned response to every extension request is the best protection. If the request has merit, grant the time or negotiate a paid acceleration. If it doesn't, say why in writing, with reference to the schedule. Silence combined with pressure to hold the date is exactly what builds the claim.

What a credible recovery schedule looks like

A recovery schedule isn't just the old schedule with shorter durations. On programs we've supported, a credible one has these features:

• It starts from the current update. Actual progress is recorded to the data date, and the remaining work is re-planned from there.
• It explains every change. Each shortened duration, new overlap or resequenced activity is listed, with the reason and the resources behind it.
• It shows the resources. If structure is going to take six weeks instead of eight, the schedule should show the extra crew, shift or crane that makes that possible.
• It addresses near-critical paths. Compressing the critical path often makes another path critical. The recovery plan has to deal with both.
• It includes owner actions. Recovery often depends on faster owner decisions, quicker submittal reviews or earlier access. Those commitments need to be in the schedule too.
• It says who's paying. The covering letter should state whether the recovery is at the contractor's cost, a paid acceleration, or under dispute.

Be careful how you accept it. As with a baseline, "approving" a recovery schedule can be read as agreeing to everything in it, including any assumption that the owner caused the delay or will pay for the recovery. Accept it as the current plan for measuring progress, and state separately that acceptance doesn't settle entitlement to time or money. Keep the previous update as well, so the effect of the recovery plan can be measured against the schedule it replaced. Have your lawyer check the wording against your contract.

Recovery options and what they cost

Not all recovery is equal. Some techniques are almost free. Others cost a lot and carry their own risks. Owners should expect the cheaper options to be exhausted before paying for the expensive ones.

View the data

Recovery option	Typical cost	Main risk
Resequence work	Low	Can make another path critical
Faster owner decisions	Low	Owner team capacity
Overlap activities (fast-track)	Low to moderate	Rework if predecessors change
Add crews or equipment	Moderate to high	Congestion, supervision limits
Extra shifts or overtime	High	Productivity loss, fatigue, safety
Change method (e.g. prefab)	Varies	Design and approval lead time

Overtime deserves a specific warning. Productivity per hour tends to fall when crews work long hours for extended periods, so the time gained is usually less than the hours added. A recovery plan built on weeks of sustained overtime should be treated with caution.

Proving acceleration costs

Even when entitlement is clear, the contractor still has to show what acceleration actually cost. FTI's article notes that in Schindler Elevator Corporation v. Walsh Construction Company of Canada and Walsh Construction v. Toronto Transit Commission, courts emphasized that the claimant must demonstrate the acceleration costs it incurred, and that costs may be denied without that proof even where entitlement exists.

For owners, that cuts both ways. If you direct acceleration, agree in advance how costs will be tracked: separate cost codes for overtime, added crews and extra equipment, with daily records. That keeps the final number honest and avoids an argument later.

Mitigation duties: what the contractor owes you

Canadian standard contracts often require each party to reduce its damages to the other. That doesn't mean the contractor has to accelerate for free. FTI notes that the SCL Delay and Disruption Protocol limits the duty to mitigate, so that unless the contract says otherwise, it doesn't require extra resources or work outside planned hours. Reasonable resequencing is expected. Paying for extra shifts to recover an owner-caused delay isn't.

When paying for acceleration makes sense

Sometimes the owner should pay to accelerate, even when the delay wasn't its fault and even when it could argue the point. The test is commercial: does the cost of recovering time beat the cost of being late?

For many owners, late completion has costs the construction budget doesn't show. A store that opens after the holiday season loses its strongest trading weeks. An office tenant may have rent abatement or termination rights tied to a delivery date. Financing carry continues, and staff, furniture and IT moves have to be rescheduled. If the delay is owner-caused or excusable, liquidated damages won't offset any of that.

Put the two numbers side by side: the priced acceleration proposal against a realistic estimate of what each week of delay costs the business. If acceleration is cheaper, negotiate it as a change, with a defined scope, target dates and cost tracking. If it isn't, accept the extension and re-plan the opening. Either way, it's a decision to make deliberately, not one to back into by pressing the contractor to hold a date.

What owners should do

1. Respond to every extension request promptly and in writing. Grant, refuse with reasons, or propose a paid acceleration. Don't leave requests unanswered while pressing for the original date.
2. Diagnose before you demand. Before asking for recovery, establish why the time was lost, using the current update and the project records.
3. Ask for a resourced recovery schedule, not just compressed durations. Check that it deals with near-critical paths and owner actions.
4. If you direct acceleration, agree the terms first. Set out the scope, the target dates, how costs will be tracked and how they'll be paid, preferably as a change order.
5. Track your own recovery commitments. If the plan depends on faster owner decisions, deliver them, or the recovery fails and the delay becomes yours.

The bottom line

Recovering lost time is a commercial decision as much as a scheduling one. Owners who diagnose the cause first, answer extension requests promptly and agree acceleration terms in writing get their time back at a fair price. Owners who simply insist on the original date may get the date, and a claim along with it. The difference usually comes down to a few well-timed letters.

Facing a late project and weighing your recovery options? Book a 30-minute call with Benjamin R. Consulting.

Sources: FTI Consulting, Mitigation and Acceleration: What's the Difference and Why Does It Matter? (September 19, 2025); Society of Construction Law, Delay and Disruption Protocol, 2nd edition (2017); Miller Thomson LLP, Concurrent delays in construction projects: How Canadian courts decide who pays (November 26, 2025). This article is general information, not legal advice. Get legal advice on your contract and specific circumstances.