1. Four cost groups that fall outside
These are not normally contained in any price per square metre. They belong in the budget as separate lines.
| Cost group | Content | Obvious to the client |
|---|---|---|
| The plot | property, not a construction cost | yes |
| Preparation | design, surveys, permits | no |
| Connections | electricity, water, sewerage, telecoms | no |
| External works | access, paving, fences, landscaping | no |
Only the first is obvious to the client. The other three are usually discovered one after another, during construction.
2. Why exclusion is not misleading
Three reasons why it is logical. These costs do not depend on the building but on the plot, the location and the existing networks.
They cannot be expressed per square metre, because they do not scale with floor area. A connection charge does not double when the floor area doubles.
They do not come from the same firm but from network operators, designers and separate contractors. That is why they never appear in a builder's quotation.
A construction firm that does not show them is hiding nothing: it prices what it does. The problem arises in interpretation, when a client reads a construction price as a project price, and the gap appears later.
3. When these costs arise
The timing explains why they are not noticed together. They arrive at different stages of the project.
| Cost group | When it arises | Why that is unfavourable |
|---|---|---|
| Preparation | before construction, often before quotations are sought | the client has no budget yet |
| Connections | at or before the start of construction | the application must be made early |
| External works | at the end of construction | the budget is tight by then |
The third timing is the least favourable. These works are dropped or done more cheaply than planned, although they are visible and used every day. The driveway and the fence are the first thing a visitor sees and the last thing weighed in the budget.
4. How large the gap is
Two reference points give the order of magnitude. On commercial sources, preparation costs including design, energy performance certificate, building permit and geodetic and ground surveys often fall between €5,000 and €15,000.
An electricity connection is, on the network operator's published example, a four figure sum up to 400 m from the substation; beyond that it is set on actual cost. The actual charge depends on the fuse size and the distance.
These two groups alone often exceed what the client had allowed for extras. And they are only two of the four.
5. How to account for them in a budget
Four steps. List all four groups as separate lines, not as a single contingency. A contingency covers what is unknown, not what is known.
Request connection quotations early, because these are concrete figures, not estimates. The network operator gives a sum that does not have to be guessed.
Allow for external works from the outset, not from the end. Left to the end, they meet an exhausted budget.
Separate the project budget from the construction budget and present both. That keeps the excluded costs visible.
The fourth step is the most useful: it ends the misunderstanding without a single figure changing. Two documents for the same project, one for construction and one for the project, prevent the entire problem described in this article.
In summary, and four practical rules
Four cost groups fall outside every price per square metre: the plot, preparation, connections and external works. Exclusion is logical, because they do not depend on the building, do not scale with area and do not come from the same firm. Preparation alone is often €5,000 to €15,000, and an electricity connection a four figure sum up to 400 m from the substation.
Four rules: list all four groups as separate lines. Request connection quotations early, because they are concrete figures. Allow for external works from the outset. Present the project and construction budgets separately.
This article serves professional orientation at the date of checking. It is not a quotation.