- Job order contracting (JOC), simple task-order contracts (SATC in some programs), and on-call agreements let an agency award a contract once and then issue many smaller projects without a new bid each time.
- In a JOC, a published unit price book describes standardized tasks, and the contractor's bid is typically an adjustment factor, or coefficient, applied to those prices.
- The competition happens at the front end, when contractors compete to hold the contract, and the long-term outcome depends on responsiveness, quality, and documentation on every task order.
- Agencies want speed, price transparency, reliable crews, and clean paperwork, and they reward contractors who deliver all four consistently.
- Pitfalls include unpriced scope, underestimated administrative effort, mismatched coefficients, and work that does not fit the catalog.
Why agencies use contracts that are not one-off bids
Public agencies have a recurring problem. They own buildings that need mechanical work all year, from a failed rooftop unit in a library to a chiller replacement in a civic center. Putting every one of those through a full public bidding process takes months, requires drawings, and uses staff time that agencies do not have. At the same time, they cannot simply hand each job to a favorite contractor, because public works law generally requires competition.
The answer many agencies adopted is to compete the contract itself. A contractor or a small group of contractors is selected through an open process, and the resulting agreement allows the agency to issue individual projects, called task orders or job orders, over a term of one or more years. When a roof unit fails in July, the agency does not start a new bid. It issues a task order to a contractor who already holds the agreement.
The names vary. You will see job order contracting, on-call or as-needed contracts, indefinite-quantity agreements, master agreements, and simplified task-order contracts. The structures overlap, but the pricing model separates them, and understanding that is the first step to working in this space.
Rules about whether and how an agency may use these contracts differ by agency type and change over time. Treat this guide as a description of the common patterns and confirm the specifics in each solicitation.
The main contract models, side by side
| Model | How price is set | Typical use | What the contractor should watch |
|---|---|---|---|
| Job order contracting (JOC) | A unit price book lists tasks and prices; the bid is an adjustment factor applied to the book | Repairs, replacements, and renovations that can be described by standardized tasks | Whether the price book covers your actual work; how non-listed items are handled |
| Simple task-order contract (SATC or similar) | Lump-sum or negotiated pricing per task order, often within a pre-qualified pool | Smaller projects with a defined scope | Whether each order is competed among pool members or assigned |
| On-call hourly or time-and-materials agreement | Published labor rates, material markup, and equipment charges | Emergency response and unplanned repairs | Not-to-exceed limits, authorization rules, and documentation expectations |
| On-call with quoted lump sums | Quote per project, with a pre-qualified list | Mid-sized replacements where a quote can be assembled quickly | How many pool members quote each order; response deadlines |
| Preventive maintenance agreement with repair allowances | Fixed service fee plus separate pricing for repairs | Ongoing service for buildings and equipment | Scope of covered visits versus billable repairs |
Pure service and maintenance contracts are another category agencies use for recurring needs, and they interact with task order structures. See our preventive maintenance program guide for how a documented service scope reduces the number of emergency orders in the first place.
Unit price books and coefficients
In a JOC, the heart of the system is a unit price book, a large catalog that assigns a price to every standardized task in construction. Each task is defined by a line item with a description, a unit of measure, and a price. The catalog may be national, regional, or tailored to the agency, and it is typically organized by construction division, with HVAC tasks in the mechanical sections: ductwork, piping, equipment set, controls, testing, and so on.
A contractor does not price the book. The contractor bids one or more adjustment factors, commonly called coefficients, that are multiplied against the book prices. Some contracts use separate coefficients for normal working hours and after-hours work, or for different categories of work. The lowest evaluated coefficient does not guarantee an award; many solicitations also evaluate qualifications, experience, and approach.
- The coefficient has to cover everything the book price does not. Overhead, profit, bonds, insurance, mobilization, and the contractor's administrative effort live in that single number.
- Book prices reflect an average project. Real jobs in tight mechanical rooms or on difficult roofs can cost more than the average, and lower-than-average jobs will cost less. The coefficient must be sustainable across the mix.
- Non-book items need a process. Real HVAC work often includes items not in the catalog, such as specialized equipment or unusual controls. The contract describes how those are priced, commonly through quotes and review.
- Wage rules still apply. Public works and prevailing wage requirements carry through to task orders. See the prevailing wage guide.
The ideas here are general. Specific procedures, such as how scope is described, whether pricing is proposed per task order, and how adjustment factors are applied, vary by program and agency.
How a task order flows from need to payment
- The agency identifies a need. A failed unit, an energy project, or a renovation is flagged by facilities staff.
- A site visit and scope definition. The agency or its representative walks the site with the contractor, and the scope is described, often with photos and measurements.
- The contractor prepares a proposal. Using the price book and the contract rules, the contractor lists tasks, quantities, and applicable pricing, and submits it for review.
- Review and negotiation. The agency checks quantities, task selection, and any non-book items. Disagreements are resolved here.
- Task order issuance. A written order authorizes the work, sets the amount, and may set the time for completion. Do not start before you have it.
- Performance. Work proceeds under the master agreement's terms, including insurance, wages, submittals, safety, and inspection.
- Inspection and acceptance. The agency verifies the work and accepts it. Some projects need permits and formal inspection, discussed in our guides on DSA and HCAI projects.
- Invoicing and payment. Invoices follow the agreement's format, with required supporting documents such as certified payroll.
Speed varies. Some agencies turn a task order from request to notice to proceed in days. Others, especially where the work is substantial, need weeks. Contractors who can walk a site and return a clear proposal quickly are seen as easy to work with, and they tend to get more invitations.
Who wins the contract and who wins the task orders
There are two competitions. The first is for the contract. Agencies evaluate proposals, which often include the pricing factor, but also qualifications, relevant experience, staffing, safety records, references, and sometimes interviews. The second competition begins after award and is more subtle: when an agency has several contractors in a pool, it decides who gets each task order, either by rotation, by competitive quote, or by judgment about fit.
| Quality | What it looks like to the agency | What undermines it |
|---|---|---|
| Responsiveness | Calls returned, site visits scheduled, proposals delivered on time | Slow replies, inconsistent staffing |
| Estimating discipline | Proposals use the right tasks and quantities and survive review | Padded quantities, missed scope, sloppy back-up |
| Field execution | Crews arrive prepared, clean up, and leave buildings as found | Delays, rework, disputes over scope |
| Documentation | Photos, readings, as-builds, certified payroll, and close-out items arrive without chasing | Missing paperwork that holds up payment |
| Technical honesty | Reports root cause and recommends what is needed, not what is easy to sell | Parts-swapping that returns as repeat failures |
| Safety and compliance | Clean safety record, proper registration, insurance in force | Lapsed certificates, wage violations |
Large mechanical systems expose another dimension: the contractor's depth. When a task order involves a chiller, a boiler plant, or a controls integration, the agency needs confidence that the team has the technical bench. For equipment categories, see our guides on chillers and hydronic systems and rooftop units.
What agencies actually want
Procurement staff and facilities managers think about on-call contracts in practical terms. They want to solve a problem without a drama. If you understand their incentives, you can structure your approach accordingly.
- Predictability. They want a reliable range for duration and cost, and they want to avoid change orders that surprise their budgets.
- Fast triage. For failures, the first question is how quickly someone can diagnose and stabilize. A temporary fix with a plan beats a delay.
- Transparent pricing. The reasoning behind a quote should be easy to follow and defensible to an auditor.
- Respect for the building. Public buildings stay in use. Noise, access, safety, and cleanliness matter to staff and the public.
- Records that survive staff turnover. Public agencies lose institutional memory when staff change. Documentation that tells the next manager what was done and why has real value. Asset records like the DaVinci Portal serve this purpose.
- Compliance without nagging. Certificates, registrations, and payroll records should arrive with the invoice.
- Honest limits. A contractor who says an order is outside capability helps the agency make a better decision than one who accepts and struggles.
Scoping and pricing practice inside a task order
Good task order work begins at the site walk. The scope on paper is often a short description from a facilities request, and the real project lives in the details: roof access, structural condition, electrical capacity, controls compatibility, and whether the failed equipment is a symptom of a larger issue.
- Take thorough photos and measurements. They support the proposal and protect against later disputes.
- Verify existing conditions. Electrical service, refrigerant type, curb dimensions, and piping condition affect the scope and may change the task list.
- Look for the cause of failure. If a compressor failed because of an airflow or electrical problem, replacing it alone invites a repeat. Our diagnostics guide outlines the approach.
- Flag code and permit triggers. Equipment replacement may require permits and energy compliance. See our Title 24 permit guide.
- Be explicit about exclusions. If asbestos, structural repairs, or electrical upgrades are not included, say so.
- Price the project, not the line item. Make sure the sum of tasks reflects crane, disposal, permits, testing, and close-out.
If the work will take the agency into a regulatory review, such as school or hospital construction, make sure the task order recognizes the extra time and documentation. A task order that assumes a two-day swap but ignores the state's requirements is a setup for conflict.
Common pitfalls
- Bidding a coefficient that cannot support administration. Task order work has overhead: site visits, proposals, revisions, reports. If the coefficient assumes none, the contract will lose money even with plenty of work.
- Forcing work into the wrong line item. Stretching a catalog task to cover something it does not describe invites audit findings.
- Ignoring non-book pricing rules. The process for items outside the catalog is a source of delay and disagreement.
- Taking every order. Declining poor-fit orders, honestly and promptly, is better than failing on them.
- Letting insurance or registrations lapse. A lapsed certificate can pause payment or eligibility.
- Treating small orders as unimportant. Small orders build the record that leads to larger ones.
- Failing to track cumulative limits. Contracts often have maximums. Know where the total stands.
- Neglecting closeout. Unfinished paperwork delays final payment and sours the relationship.
Before pursuing an on-call or JOC contract, ask whether you can respond within the agency's expected time, price transparently, staff the crews, and document every order. If the answer is uncertain, strengthen the operation before you bid.
How we approach this kind of work
Davinci Mechanical is the commercial and union division of Scottish Tom's Heating & Air, California contractor license #1083101, serving Orange County as home base and other Southern California counties for larger commercial and public projects and bid work. We work with UA Local 250 labor, are prevailing-wage and PLA ready with certified payroll, and document service through the DaVinci Portal. When a solicitation for an on-call or job order agreement appears, we review the scope, price book, registration, bonding and insurance requirements, and workload fit before deciding to respond.
Agencies exploring this approach can read about how public owners structure procurement in our public agency and school HVAC procurement guide, or visit our pages on city and county government buildings and bid projects.
Frequently asked questions
What is job order contracting?
JOC is a procurement method in which an agency awards a contract for a term, pre-prices a catalog of tasks in a unit price book, and issues individual job orders as needs arise. Contractors bid an adjustment factor, or coefficient, that is applied to the book prices.
What is a coefficient in a JOC?
A coefficient is the multiplier a contractor bids against the unit price book. It must cover overhead, profit, bonds, insurance, and administration. Contracts may use more than one, such as for normal and after-hours work.
Does the lowest coefficient always win?
Not necessarily. Many solicitations evaluate qualifications, experience, and approach in addition to price. Read the evaluation criteria in the solicitation.
Are prevailing wage rules applicable to task orders?
Generally, public works task orders carry the same prevailing wage and registration requirements as other public works, including certified payroll. Confirm with the agency, since details vary by funding and project type.
How are items outside the unit price book priced?
Contracts usually describe a process for non-listed items, often a quoted price supported by documentation and subject to agency review. The process differs by agency, so read the agreement.
Can emergency repairs be handled through an on-call contract?
Many agencies maintain on-call agreements for emergency and as-needed repairs, with defined response expectations and authorization limits. Confirm the response terms and limits before you commit to them.
Have a site this applies to?
Davinci Mechanical is the commercial and union division of Scottish Tom's Heating & Air. Send us the equipment list or the problem and we'll tell you what we'd check first.