Controlling a construction budget does not simply mean trying to build more cheaply.
It means understanding what is being built, what it is likely to cost, which decisions genuinely affect that cost and when those decisions need to be made.
In both new construction and renovation projects, a significant proportion of budget overruns do not arise because construction has suddenly become unexpectedly expensive. They often originate much earlier: an overly ambitious brief, insufficient design definition, late decisions, omitted items or contractor quotations that cannot be compared properly.
In Andorra, topography, access, logistics, climate and certain characteristics of the existing building stock can also have a significant impact on cost.
The budget should therefore be part of the project from the earliest decisions, rather than something considered only when contractors are asked to submit prices.
The budget starts before the design
A common mistake is to define everything the client wants first and ask how much it costs afterwards.
The process should be more interactive.
Brief, area, level of finish, technical complexity and budget need to develop together.
A project with €300,000, €600,000 or €1 million available will not involve the same design decisions.
This does not mean designing solely according to price. It means establishing an economic framework that is consistent with the ambitions of the project from the outset.
In a renovation, for example, decisions may be needed about whether to retain the existing layout, move bathrooms and kitchens, replace all services or only part of them, or intervene in the building envelope as well.
Each of these decisions can significantly alter the cost before materials or finishes have even been discussed.
Distinguish the available budget from the construction budget
The amount a client can invest is not necessarily the amount that can be paid directly to contractors.
An overall project budget may include:
- construction works;
- architects’ and consultants’ fees;
- preliminary studies;
- surveys and topography;
- administrative fees and procedures;
- engineering and specialist studies;
- fitted or bespoke furniture;
- kitchens and equipment;
- decorative lighting;
- landscaping;
- potential utility connections;
- contingencies;
- applicable taxes.
This distinction is fundamental.
If the entire available budget is treated as the target construction cost, every expense outside the building contract will automatically create an overrun.
The first task is therefore to determine what proportion of the overall budget can genuinely be allocated to construction work.
Estimate at several stages, not just once
A budget should not be a figure established at the beginning and then forgotten until construction starts.
Its accuracy should increase as the design develops.
First estimate: order of magnitude
During the early stages, there is not yet enough information to prepare a detailed cost plan.
The objective is to establish whether the brief, area and level of intervention are compatible with the intended investment.
At this stage, a range is often more meaningful than an apparently precise figure that cannot yet be justified.
An initial estimate of €400,000 to €450,000, for example, represents the genuine level of uncertainty better than an estimate of €423,750 when very little of the project has been defined.
Second estimate: developed design
Once the layout, construction strategy, principal materials and building services have been defined, the estimate can become more accurate.
Major work packages can then be assessed separately:
structure, façades, windows and doors, finishes, services, bathrooms, kitchen, fitted furniture, lighting and external works.
This is where meaningful opportunities for cost prioritisation begin to emerge.
Third estimate: contractor tendering
The real validation comes when several contractors price sufficiently detailed project documentation.
The original assumptions can then be tested against actual construction prices.
At that point, the budget begins to move from an estimate towards a contractual basis.
Design precision directly affects pricing
Obtaining three quotations does not necessarily mean obtaining three comparable offers.
When the documentation is incomplete, each contractor has to interpret what is included.
One may allow for certain works while another excludes them. One may price a complete technical solution while another assumes a simplified version. Some items may appear as provisional sums or may be left out entirely.
The cheapest quotation may simply be the offer that includes the least.
Before approaching contractors, drawings, details, quantities, specifications and performance requirements should therefore be sufficiently defined.
The more precise the documentation, the less room there is for interpretation.
This improves both financial comparison and the quality of the finished project.
Compare scope, not only the total
Two quotations of €400,000 and €450,000 do not necessarily mean that the second contractor is 12.5% more expensive.
Before comparing totals, the content of each quotation needs to be reviewed.
Key points include:
Scope
Are both contractors pricing exactly the same work?
Quantities
Are areas, units and quantities comparable?
Quality
Are equivalent materials, systems and performance levels included?
Exclusions
What has not been included?
Provisional sums
Which elements do not yet have a final price?
Alternatives
Has either contractor changed the proposed solutions?
Programme
Are the expected construction periods comparable?
Only after these points have been normalised does it make sense to compare the final totals.
Separate base cost, options and contingency
An effective approach is to avoid treating the entire budget as one single figure.
It can be divided into three levels.
| Level | Purpose |
|---|---|
| Base cost | Work required to deliver the project correctly |
| Options | Desirable elements that can be confirmed or removed depending on budget |
| Contingency | Reserve for circumstances that could not be known precisely |
This structure makes it easier to make decisions without repeatedly questioning the entire project.
Options might include certain bespoke furniture pieces, material upgrades or additional external works.
Contingency serves a different purpose. It should not be used to fund new ideas introduced during construction.
Its purpose is to absorb genuine uncertainty.
Renovation and new construction involve different levels of uncertainty
In new construction, much of the project can be analysed before work begins.
A renovation always contains parts of the existing building that cannot be fully understood in advance.
Behind a suspended ceiling, inside a wall or beneath a floor finish, there may be old services, a different structure from the one expected, moisture or construction that does not correspond to the available drawings.
A thorough survey and diagnostic phase reduces this uncertainty, but cannot eliminate it entirely.
The contingency allowance therefore needs to reflect the type of project.
A substantial renovation of an older building generally requires more capacity to absorb unforeseen conditions than a light intervention in a recent and well-documented property.
The objective is not to artificially inflate the budget. It is to recognise which parts of the project still carry financial risk.
In Andorra, topography and access can significantly change the cost
For a mountain house, the building cannot be considered independently from the land.
Excavation, earthworks, retaining walls, foundations, access and removal of excavated material can represent significant amounts.
Logistics also matter.
A construction site located on a difficult road, within a dense urban area or on a steep plot may require very different resources from a site with straightforward access.
Before assessing the cost of the building, it is therefore important to understand how it can actually be constructed.
This analysis begins during the study of the site and the positioning of the building.
Not every square metre costs the same
An average cost per square metre can be useful for an initial assessment.
It also has important limitations.
Two 200 m² houses may have very different construction costs.
A compact floor plan generally requires less façade than a fragmented form. A house with numerous bathrooms contains more services than another property of the same size with a different brief. Long structural spans, double-height spaces and specialist glazing also affect cost.
In renovation, the relationship between floor area and price is even less direct.
Renovating 60 m² containing a kitchen, two bathrooms and a complete replacement of building services may be proportionally more expensive than carrying out a simple intervention across a much larger floor area.
Cost per square metre is useful for comparing orders of magnitude, not for replacing a project-specific cost plan.
Small decisions also add up
A budget overrun does not always come from one major decision.
It can develop through many smaller changes:
a slightly more expensive finish, additional lighting, a specialist door, another piece of furniture, upgraded taps or more complex joinery.
Individually, these changes may seem minor.
Accumulated over several months, they can amount to tens of thousands of euros.
Each change should therefore be assessed through two questions:
What does it add to the project?
What is its financial impact?
Establishing priorities does not reduce architectural quality. A well-managed budget makes it possible to invest more precisely in the elements that genuinely create value.
Late decisions generally cost more
The same decision can have very different financial consequences depending on when it is made.
Changing a layout during design may simply require drawings to be revised.
Making the same change after services have already been installed may involve demolition, rerouting, additional work and delays.
Budget management is therefore closely connected to the timing of decisions.
Materials, equipment and technical elements need to be approved at the appropriate stage.
Not everything has to be decided on the first day. Essential decisions should not be left until construction either.
Changes during construction should be documented
It is normal for a project to evolve during construction.
The important point is to identify each change before it is carried out whenever possible.
A variation should record:
- what is changing;
- why it is changing;
- how much it costs;
- which work it replaces;
- what impact it may have on the programme.
This makes it possible to distinguish clearly between a necessary adaptation and an increase in the original scope.
Without this process, small variations can accumulate until their financial impact is only discovered at the end of the project.
The budget also depends on time
Cost and programme are connected.
A project that takes longer than expected may generate additional labour, equipment hire, coordination or overhead costs.
Excessively accelerating construction is not free either. It may require more teams working simultaneously, additional coordination or specific logistical arrangements.
A realistic programme is therefore also a cost-control tool.
On complex projects, budget, design and programme need to be considered together.
Where is it worth investing?
Controlling the budget does not mean systematically choosing the cheapest solution.
Some elements have a strong influence on comfort, durability and future maintenance.
Good external windows, a properly designed building envelope, correctly sized technical systems and durable construction details may justify a higher initial investment.
Elsewhere, the difference between a carefully selected standard solution and a much more expensive alternative may have little effect on the finished result.
Part of the design process is to establish this hierarchy.
Not every euro spent creates the same architectural value.
A controlled budget is not a fixed budget
A project will involve decisions, adjustments and sometimes unforeseen conditions.
Expecting the figure calculated during the first studies to remain completely unchanged until completion is unrealistic.
The objective is different: to know where the budget stands at every stage, why it has changed and what decisions can be made to maintain the overall balance.
When the brief, design, technical development, contractor tendering and construction monitoring form part of the same process, financial decisions are no longer made after the event.
They become part of the design itself.
At Studio Tamy, we approach the budget in this way: as a project tool that accompanies decisions from the earliest studies through to construction.
Building or renovating within a defined budget does not mean limiting architecture. It means concentrating resources where they genuinely improve the project.