1) Why It Is So Popular
A single number feels quick and comparable, which suits early feasibility. The problem starts when this rough reference moves into decision and contract stages, where scope differences hide behind the same figure.
2) Variables Behind the Same Area
Soil and foundation, structure and geometry, façade and insulation, mechanical and electrical systems, finish quality, and site access all move cost. Small differences add up to a wide range.
3) Villa vs Apartment Trap
Villas carry higher roof, façade, landscaping and service run shares; apartment blocks benefit from repeated floors. Gross versus net area, balconies, basements and common areas must be defined. Early architectural design decisions reduce this risk.
4) Listed Buildings
In heritage buildings cost follows the intervention—facade repair, structural strengthening, timber floors, decorative restoration—not floor area. Board approval, surveys, and trial panels add effort. See the restoration cost guide.
5) Itemised Estimating
Split the work into packages with quantities, units, and prices. It shows where the budget goes and makes design changes measurable. Use ranges when uncertainty is high, but state the assumptions.
6) Wrong Bid Comparisons
Equal per-m² offers may exclude scaffolding, waste, temporary power, or design revisions. Use one specification, one quantity schedule, and an inclusion/exclusion list; inspect item breakdowns. This discipline matters in construction projects.
7) Practical Budget Approach
Define needs and quality, develop concept design, prepare a range estimate, detail the design, collect bids, compare by item, and keep a contingency matched to project risk.
8) Conclusion
Use per-m² for early ideas only; use itemised estimates for decisions. For budget or bid support, contact us or see our consultancy service.