Perit Warrant Exam common mistakes
Perit Warrant Exam · Understand the traps and how to avoid them.
Calculating quantities from the plan dimensions without cross-checking the written measurement criteria (criterios de medición) in the project documentation, so items such as openings, party walls, or finishes are counted twice or omitted entirely.
Candidates treat measurement as pure geometry and skip the specification and budget preamble, where the rules on deduction of openings, measurement of sloping surfaces, and inclusion of auxiliary works are defined. Under exam time pressure they jump straight to scaling the drawing.
What to do instead
Before computing any quantity, write a one-line rule card for each item type (e.g., 'openings >X m² deducted', 'slopes measured on plan projection') taken from the stated criteria, and apply it item by item. Practise on a full budget where every line is justified by an explicit rule, not by intuition.
Applying unit prices (precios unitarios) without decomposing them, so the candidate cannot tell whether a price includes labour, machinery, indirect costs, or VAT, and mixes bases across budget lines.
Many candidates memorise composite prices as single numbers. When the exam changes the crew size, output rate, or asks for the cost breakdown, they cannot rebuild the price and default to guessing.
What to do instead
Drill the structure of a unit price: basic direct cost (materials, labour with social charges, machinery), indirect costs, and profit, then tax. Rebuild at least ten prices from a rendimiento table (output per crew-hour) until the arithmetic is automatic, and always state which cost basis a figure refers to.
Confusing the roles and legal force of planning instruments, treating a municipal urban plan, a regional directive, and a sectoral law as interchangeable, and ignoring which instrument prevails in a conflict.
Candidates learn instrument names as vocabulary lists rather than as a hierarchy. Exam items often hinge on which authority has competence or which rule supersedes another, and a name-matching strategy fails there.
What to do instead
Build a hierarchy map (state law, regional law, municipal general plan, subsidiary rules, sectoral plans) with the competence of each and the conflict rule (higher rank, later date, more specific). Answer practice items by naming the instrument, its rank, and the authority that approves it.
Ignoring the difference between the licensed/approved design and deviations executed on site, and answering questions about liability as if any change agreed verbally with the client is valid.
Candidates reason from everyday construction practice, where informal changes are common, instead of from the permit and contract framework. They forget that a modification affecting structure, use, or volume requires a revised project and authorisation.
What to do instead
For every scenario question, first ask: does this change affect structure, use, volume, or safety? If yes, identify the required procedure (modified project, new permit, municipal licence) and the professional who must sign it. Keep a checklist of changes that trigger re-approval.
Selecting structural systems or member sizes by rule of thumb (e.g., span/30 for a beam depth) without checking the governing limit state, load combination, or deflection criterion.
Rules of thumb are memorable and produce plausible numbers, so candidates stop there. Exam items deliberately include cases where deflection, vibration, or fire resistance governs rather than bending strength.
What to do instead
For each predimensioning rule, learn the conditions under which it applies and the limit state it implicitly satisfies. Practise verifying a proposed depth against both strength (ULS) and deflection (SLS) using the stated combination, and state which one governs.
Mixing service design criteria, applying plumbing flow rates to drainage sizing or using ventilation rates for smoke control, and forgetting the units (l/s versus m³/h, Pa versus kPa).
Installation topics are studied in separate blocks and the numeric criteria blur together. Under exam pressure candidates recall a familiar number without recalling which service it belongs to.
What to do instead
Create a one-page criteria table per service (water supply, drainage, HVAC, electricity, fire protection) with the parameter, its unit, and the standard or regulation it comes from. In practice items, always write the unit before substituting the value.
Applying a single U-value or insulation thickness to every orientation and climate zone, ignoring thermal bridging and the difference between the envelope's nominal and corrected transmittance.
Simplified energy exercises reward plugging numbers into a formula, so candidates skip the correction factors. They also overlook that the same solution cannot satisfy the requirement in different climate zones.
What to do instead
Learn the corrected U-value calculation including linear and point thermal bridges, and practise selecting envelope solutions per climate zone against the regulatory limit. Always check the result against the zone's maximum allowed value, not against a generic target.
Building a construction schedule by listing activities in sequence without identifying the critical path, dependencies, or float, so questions about delays or resource levelling are answered by intuition.
Candidates know the network diagram method in theory but avoid drawing it under time pressure. Without the network they cannot determine which delay actually shifts completion.
What to do instead
Practise drawing the network for short projects (10-15 activities), computing early and late dates, and marking the critical path. For delay questions, always propagate the delay through the network before concluding whether the end date moves.
Treating professional liability and ethics questions as general opinion, answering what a reasonable person would do rather than what the professional code, contract, and insurance framework require.
Candidates rely on personal judgement and miss the specific duties: signing only work within one's competence, documenting instructions, declaring conflicts of interest, and keeping professional indemnity cover.
What to do instead
Anchor every ethics answer in a named duty or document (competence, independence, confidentiality, contract scope, professional indemnity). For liability items, distinguish contractual liability, tort liability, and decennial or statutory liability, and identify the limitation period that applies.
Reading a regulation or contract clause once and answering from the first sentence, missing exceptions, thresholds, or 'unless otherwise stated' provisos that reverse the outcome.
Exam items are written with a qualifying clause precisely to test careful reading, and candidates skim for keywords under time pressure. Legal and technical clauses often place the decisive condition at the end.
What to do instead
Practise a fixed reading routine: identify the subject, the obligation, the threshold, and the exception before choosing an answer. For legal items, restate the clause in your own words in one sentence and check the chosen option against all four elements.