Monthly database
It can read the month's XLSX reports (inputs, compositions, families and coefficients, maintenance updates) and build a database the team can look things up in.
Deliverable: monthly database with the origin of every numberOcto for cost estimating with SINAPI
The table changes every month. So can the check.
SINAPI is Brazil's main cost reference for construction and engineering services, maintained by Caixa (the federal savings bank) and IBGE (the national statistics institute). Every month Caixa publishes the reports as spreadsheets and PDFs. Octo can read these reports, cross-check them against your team's estimate and point out what changed, always for the estimator to review.
Maintained byCaixa and IBGEas required by Decree 7.983/2013
ReportsMonthlyin two ZIP files: XLSX and PDF
Law 14.133/2021Art. 23SINAPI in the estimated value of projects
Sources4listed at the end of the page
01
What Octo does in cost estimating.
Four possible deliverables. None of them sets prices: all start from the published reports and go to the estimator.
Estimate check
It can cross-check the composition codes in your estimate against the month's reports and list what changed.
Deliverable: list of differences for the estimatorComposition breakdown
It can break each composition down into inputs and auxiliary compositions, with the coefficients, as SINAPI defines them, and point to the matching Technical Booklet.
Deliverable: detailed composition with the referenceMedian benchmark
It can compare the estimate's unit costs with the SINAPI median, the Decree 7.983/2013 rule for projects funded by the federal government, and flag what exceeds it.
Deliverable: list for the estimator to analyze
02
Eight arms, one estimate.
The same Octo cycle, applied to this workstream. Each arm has a narrow role; the people who approve and sign are on your team.
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Discovery
Understands the estimate
Which program or spreadsheet holds the estimate, which codes it uses, and which month and state the reference is from.
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Data
Pins down month and state
Every SINAPI number applies to one month and one Brazilian state. Without that on record, the comparison doesn't add up.
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Security
Respects the estimate
The estimate belongs to the client and may be confidential in a bid. Octo works only in the environment the team gives it access to.
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Architecture
Picks the path
Caixa's XLSX reports for the database, a spreadsheet or script for the cross-check, PDF for reference only.
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Development
Writes the cross-check
A script that reads the month's reports and the estimate, with the origin of every number noted.
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Review
Checks against a known item
Compares with compositions the estimator has already checked by hand.
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Release
Delivers the list
With your OK, it leaves the list of differences in the estimate folder.
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Documentation
Records the reference
Month, state and Caixa files used in each estimate.
Octo does not sign estimates. Responsibility for the reference estimate lies with the professional who prepares it.
03
Each task, its own path.
The criteria Octo uses to choose. The tool your team already uses remains the reference.
| Task | Path | Note |
|---|---|---|
| Monthly database | Caixa's XLSX reports | Inputs and compositions for every state |
| Detail of a composition | Analytical report and Technical Booklet | Inputs and auxiliary compositions, with coefficients |
| Project funded by the federal government | Decree 7.983/2013 | Unit cost up to the SINAPI median |
| Transportation infrastructure | SICRO, from DNIT | Its own reference, separate from SINAPI |
| Estimated value in a bid | Law 14.133/2021, art. 23, § 2 | SINAPI median, or SICRO for transportation |
04
From request to routine.
Three steps. Each one only makes sense after the previous one has shown results on your team.
A proposal, not a promise
On-demand checks
You send the estimate and the month, and Octo returns the list of differences.
- Monthly database built from Caixa's reports
- Cross-check by composition code
- Compositions broken down when needed
Monthly routine
With each Caixa release, the database is updated and the estimates in progress are cross-checked.
- Database updated every month
- A list for each estimate in progress
From model to estimate
Quantities extracted from the model can be linked to the compositions.
- Quantities traced back to the model
- Compositions chosen by the estimator
05
Confirmed by sources.
Every point below has a source published by the vendor, the project or the responsible agency. The sources are in the next section.
6
points with a published source, each with its reference alongside.
- ConfirmedWhat SINAPI is
- The National System of Construction Cost and Index Surveys (Sistema Nacional de Pesquisa de Custos e Índices da Construção Civil): Brazil's main cost reference for construction and engineering services, as required by Decree 7.983/2013, maintained jointly by Caixa and IBGE.Source: Caixa, SINAPI page
- ConfirmedPublished methodology
- The methodology is in two books, “Metodologias e Conceitos” (Methodologies and Concepts, 11th edition, March 2026) and “Cálculos e Parâmetros” (Calculations and Parameters). Caixa maintains the Technical Booklets of Service Compositions and the Technical Specification Sheets for Inputs; since 2022 there have been parametric compositions.Source: Caixa, SINAPI page and methodology book
- ConfirmedMonthly reports
- They come in two ZIP files: XLSX (families and coefficients, maintenance updates, labor percentage, inputs and compositions for every state) and PDF (composition breakdowns, composition costs and input prices). Until 2024, they were published by state.Source: Caixa, SINAPI page
- ConfirmedComposition and price
- A service composition is the set of inputs and auxiliary compositions needed to perform one unit of the service. To generate monthly prices for every state, IBGE uses the homogeneous input family methodology.Source: Caixa, Metodologias e Conceitos book
- ConfirmedDecree 7.983/2013
- Sets the rules for the reference estimate of construction and engineering services funded by the federal government: unit costs less than or equal to the SINAPI median. For transportation infrastructure, the reference is SICRO, maintained by DNIT.Source: Planalto, Decree 7.983/2013
- ConfirmedLaw 14.133/2021
- Under art. 23, § 2, the estimated value of construction and engineering services relies first on unit cost compositions up to the SINAPI median, or the SICRO median for transportation infrastructure.Source: Planalto, Law 14.133/2021
06
What Octo does and what stays with you.
Octo prepares everything, but does not sign. The document of record stays with whoever is accountable for it.
Octo prepares
Surveys, calculates, organizes and produces the documents: spreadsheets, reports, drawing sheets and drafts.
Deliverable: material ready to checkYour team checks
The licensed professional checks what Octo delivered before signing. If something doesn't add up, it goes back to Octo with the correction.
Step: review by the signerWho signs
Octo does not sign. Designs, technical reports, ART/RRT (Brazil's professional responsibility records), accountability reports and any official document are still signed by the company's or agency's licensed professional: here, the responsible engineer or architect, with an ART or RRT.
Sign-off: engineer or architect, with ART/RRT
07
Sources.
Caixa and federal legislation published on the Planalto website. Accessed on October 28, 2026.
- Caixa: SINAPIMonthly reports and technical documentation
- Caixa: SINAPI, Metodologias e ConceitosMethodology book, PDF
- Planalto: Decree 7.983/2013Reference estimate with federal funds
- Planalto: Law 14.133/2021Art. 23, § 2
The estimate checked with every release.
The assessment starts with an estimate your team has already closed, without changing anything. You get a proposal for what can be checked every month and decide with it in hand.