Public Works: How to Bid on Engineering Tenders Without Getting Burned

Bill of quantities, physical-financial schedule, CAT, certificates covering the most technically relevant items, and performance guarantees. What a public works tender requires and why so few companies compete for it.

Published Aug 25, 2026 · Updated Oct 23, 2026 · Busca Licitações Team · 11 min read

This text was written for companies registered in Brazil. Foreign suppliers should also read how foreign companies can bid in Brazilian public tenders.

Construction works and engineering services are the highest-value contracts in any municipality: paving, drainage, building a school, renovating a health clinic, a bridge, a sports court, a public square. They are also the ones fewest companies compete for — not for lack of interest, but because the required qualification weeds out anyone who has not prepared.

That barrier is good news for those who do qualify. While a reverse auction (pregão) for office supplies attracts twenty bids, a competitive bidding (concorrência) for a mid-sized construction project usually draws three to six. This guide shows what a public works tender (licitação) requires, how to put together your bid and where the risks lie that break unprepared construction companies.

What changes compared with buying products

There are three structural differences. First: the subject of the contract is not a catalog item but a design — and the bid is built on a bill of quantities, with unit prices for each service. Second: technical qualification is strict and tied to professionals registered with a professional council. Third: execution is measured in stages, with payment based on the physical progress certified by the agency's inspectors.

Add to that long timelines, exposure to fluctuations in material costs and the personal technical liability of the engineer or architect in charge — and it becomes clear why this market has fewer competitors.

Technical qualification: CREA, CAU, certificates and CAT

The standard set of requirements:

• Company registration with the regional CREA (engineering council) or CAU (architecture and urbanism council), active and with a compatible scope of business;
• A technical lead (responsável técnico) linked to the company, in good standing with the council;
• The company's technical capacity certificate (atestado de capacidade técnica), proving it has carried out a compatible project;
• CAT — Certidão de Acervo Técnico (technical track-record certificate) for the professional, issued by the council, linking them to the previous project;
• A statement of availability of staff, equipment and facilities;
• A site visit or a statement of awareness of site conditions, when required.

The point that raises the most questions is the items of greatest technical relevance (parcelas de maior relevância técnica). The tender notice (edital) selects the most critical services in the project — for example, built area, volume of structural concrete, length of paving — and requires proof of previous execution of a minimum quantity of each one of them. Having done "a similar project" is not enough: you have to match it item by item.

Because the track record belongs to the professional, not the company, construction firms keep engineers who hold relevant CATs on their staff. This is an expensive, sought-after asset in the market — and it is why the departure of a technical lead can make it impossible for the company to bid on certain tenders.

The bill of quantities and the schedule

A bid for a construction project is not a made-up lump-sum price: it means filling in a schedule of services and quantities provided by the agency, with a unit price for each item. The sum gives the total value, and the committee checks each line for consistency.

Reference prices usually come from official cost databases, with the payroll tax relief (desoneração) regime and the BDI defined in the tender notice. BDI — Benefícios e Despesas Indiretas (indirect costs and profit markup) — covers head-office overhead, insurance, guarantees, risks, taxes and profit, and the tender notice usually sets acceptable limits. Submitting a BDI outside a reasonable range, whether too high or too low, triggers a due-diligence inquiry.

Along with it comes the physical-financial schedule (cronograma físico-financeiro): how much of the project will be carried out and invoiced each month. It has to be feasible — a schedule that concentrates 60% of the work in the first month of a project that depends on concrete curing will not pass review, and it disrupts the payment flow.

Bid unbalancing: the mistake that turns into trouble

"Bid unbalancing" (jogo de planilha) is the practice of overpricing services whose quantities tend to increase during construction and underpricing those that tend to decrease. Audit courts (tribunais de contas) condemn this practice, and it may be treated as attempted fraud.

Beyond the legal risk, it is a terrible business decision: when the inspectors spot it, the company loses credibility and faces disallowances on its progress measurements. Build your bill of quantities with consistent prices item by item — margin is built through the BDI and efficient execution, not by distorting quantities.

Performance guarantee and surety bonds

Construction contracts usually require a guarantee equal to a percentage of the contract value, provided in cash, government bonds, a surety bond (seguro-garantia) or a bank guarantee. It has a cost, which must be included in the BDI, and it ties up capital when provided in cash.

For larger projects, Law 14,133/2021 (Brazil's Public Procurement Law) allows the agency to require a surety bond with a step-in clause (cláusula de retomada): if the company fails, the insurer takes over completion of the project. For the contractor, this means a default does not just lead to a fine — it can lead to being replaced on the project, with major reputational damage and difficulty obtaining insurance in the future.

Measurement, amendments and rebalancing

Payment follows execution: in each period, the inspector measures what has been carried out, approves the measurement report and releases the corresponding invoice. Disagreements over measurement are the number one source of friction, and the defense is documentary — photographic records, an up-to-date site log and formal communication.

Changes happen on almost every project: the design runs into the reality of the site. The law allows quantitative and qualitative amendments (aditivos) within percentage limits, formalized before the extra work is performed. Doing the work first and requesting an amendment afterward risks working for free — the agency cannot pay without contractual coverage.

Economic-financial rebalancing (reequilíbrio econômico-financeiro), on the other hand, covers unforeseeable events that substantially alter the contract's balance, such as a sudden spike in the price of a material. It requires robust documentary evidence.

Execution regimes: what each one means for you

The tender notice defines how the project will be contracted, and the regime completely changes how risk is allocated.

Under a unit-price contract (empreitada por preço unitário), you are paid for what you actually execute, measured service by service. The quantity risk lies with the government: if the volume of excavation is greater than planned, more is measured and more is paid, through an amendment. This is the most common regime and the safest one for the contractor.

Under a lump-sum contract (empreitada por preço global), you are paid a fixed amount for the entire project. The quantity risk becomes yours: a design error that increases the work comes out of your pocket, unless the scope is formally changed. It requires a thorough check of the design before you bid.

Under integrated contracting (contratação integrada), the contractor prepares the basic design and the detailed design, in addition to building the project. It concentrates risk and responsibility, and that is why it is reserved for specific types of projects. Semi-integrated contracting (contratação semi-integrada), in turn, starts from a basic design provided by the agency and transfers the detailed design to the contractor.

Before calculating any price, identify the regime. The same project, at the same value, carries radically different risk depending on who is responsible for the quantities.

Risks that break construction companies

• Deficient design — unrealistic quantities in the bill of quantities, which only show up during execution;
• An optimistic schedule, leading to late-delivery fines on a project that could never have been finished in that time frame;
• Insufficient working capital to carry out the work before it is measured and paid;
• Fluctuations in material costs on a long project without a well-defined price adjustment clause;
• Extra work carried out without a formal amendment signed in advance;
• Rain and seasonality not factored into the schedule;
• Poorly managed subcontracting, where the responsibility remains yours.

The risk matrix and what it protects

Law 14,133/2021 made the risk matrix (matriz de riscos) a key document in construction contracts, especially the larger ones. It expressly allocates who is responsible for each event: rainfall above the historical average, delays in handing over the site, unmapped interference from utility companies, extraordinary changes in material costs, design changes at the agency's initiative.

For the contractor, it is a protection — as long as it is read before bidding. Risks allocated to you must be priced in; risks allocated to the government provide an objective basis to request more time or rebalancing when they occur. A matrix that shifts everything onto the contractor should be factored into the price or contested through a challenge, as discussed in challenging a tender notice.

In practice, three risks account for most of the problems in municipal construction projects: site handover and pending expropriations, interference from water, sewage and power networks not mapped in the design, and seasonal weather. Check how the tender notice handles each one before you sign.

Site log and formal communication

If there is one habit that separates construction companies that win contractual disputes from those that lose them, it is documenting the work. The site log (diário de obra) — a daily record of workforce, work performed, weather conditions and incidents — is mandatory in engineering contracts and becomes key evidence in any dispute.

Alongside it, three simple routines: dated photographic records of each stage, formal letters for all relevant communication with the inspector (not messaging-app chats) and an organized copy of the approved measurements. When a dispute arises over delays, scope or payment, those who keep this record resolve it in days; those who don't argue for months.

One point bears repeating: delays caused by the agency must be recorded at the moment they occur. A site not handed over, a design not provided, a pending work order — all of these justify an extension of the deadline, but only if documented when they happened, not claimed at the end of the project.

Frequently asked questions

Can a new company compete for public works?

Yes, in the smaller tiers — minor repairs, renovations, building maintenance services — where the certificate requirements are proportionate to the contract. Larger projects require a track record that is built over years.

Can I use the track record of an engineer hired just for the tender?

The professional must be linked to the company and take on technical responsibility for the project. A merely formal link, with no real involvement, is an irregularity that inspectors detect.

Is a site visit mandatory?

It depends on the tender notice. When one is provided for, it usually allows a statement of awareness of site conditions instead — requiring mandatory physical attendance is questionable because it restricts competition.

What is stage-based measurement?

It is the periodic assessment of the work performed, compared against the schedule, which authorizes invoicing for that portion. Without an approved measurement, there is no payment.

Is it worth bidding on projects outside my region?

Only with a local structure or a reliable partner. Mobilizing staff and equipment hundreds of kilometers away eats into margins quickly, and inspection is done on site.

Subcontracting: using it without losing control

Almost every construction project involves subcontracting — electrical, plumbing, window frames, earthworks. The tender notice defines what can be subcontracted and up to what percentage, and some of the items of greatest technical relevance are often off-limits precisely because they were the basis of the technical qualification.

Three precautions that prevent problems. First, the responsibility remains yours: before the agency, the main contractor is the one accountable for deadlines, quality and labor obligations. Second, put in writing with the subcontractor the same deadlines and requirements you committed to, including proof of good standing. Third, check that the subcontractor is not barred from contracting with the government — a sanctioned company in your supply chain causes problems for the entire contract.

Well managed, subcontracting is what allows mid-sized construction companies to bid on projects beyond their own operational size. Poorly managed, it is the source of cascading delays that you do not control but are held accountable for.

How to grow in this market

The path follows a clear and fairly predictable logic. Start with maintenance services and small renovations, where technical requirements are low and the cycle is short — each completed contract yields a certificate and a CAT. Then move on to mid-sized projects in your municipality and region, where your accumulated track record already covers the items of greatest technical relevance.

From there, the limit is no longer technical but financial: larger projects require working capital to fund months of work before the measurements, a performance guarantee of significant value and an equipment structure. This is the point where many construction companies stall — not for lack of a track record, but for lack of financial staying power.

That is why the most useful advice for anyone climbing this ladder is to size your growth by your cash, not by your track record. Winning a project too big for your capital is the fastest way to lose everything you built on the small ones.

Where to start

If your company is registered with the council and has a technical lead, start with the smaller contracts: renovations, building maintenance, small engineering services — often awarded through a direct award (dispensa) or a reverse auction, with technical requirements suited to a company that is still building its track record.

Follow the public works and engineering tenders and the building maintenance tenders in your region, and read two or three complete basic designs before bidding. Reading a design reveals the quality of the tender notice — and a poorly prepared design is the main indicator of a troubled project.

public worksengineeringtechnical qualification