Renovation quotes in Spain differ mainly because builders interpret the scope differently, assume different conditions for hidden services, measure differently, include different materials, treat VAT and exclusions differently, and price risk and logistics in their own way. Overhead and workload play a part too. Aligning scope and assumptions usually explains most of the gap; the rest is a matter of value, not of honesty.
Are the builders pricing the same job?
The first and biggest source of difference is interpretation. A request such as “renovate the bathroom” leaves a lot unsaid: are the pipes renewed, is the shower level with the floor, do the tiles go to the ceiling, are the toilet and basin included? Each builder fills the gaps with their own assumptions, often based on what their typical client wants. One assumes a full renewal; another assumes a refresh.
The result is that each quote is reasonable for the job the builder imagined, and the jobs are different. The cure is a clearer brief and the same written questions to every builder. Our blog post on mistakes when asking for a quote explains how to write one.
How do assumptions about hidden work change the total?
The second source is what cannot be seen. When a builder cannot see the pipes, the screed or the plaster behind tiles, they have three choices: assume they are fine and leave them out, assume the worst and include everything, or include them as provisional lines and explain how they will be confirmed. Each choice produces a very different total.
The builder who assumes the best looks cheapest and may be right — or may come back during the works with additional costs. The builder who assumes the worst looks expensive and may be right too. The provisional approach is the most transparent. Our guide on unexpected costs describes how a good provisional line is written, and rewiring and plumbing cost shows why services are the most common hidden variable.
Do quantities and measurements really vary?
More than you might expect. One builder measures tiling net of the door and window openings, another gross. One includes the ceiling of the bathroom in the paint line, another leaves it out. One measures the floor of the whole flat including under the kitchen units, another only the visible floor. Small differences in each line add up across a whole quote.
When you see a significant difference in a quantity, simply ask how it was measured. There is usually a straightforward answer, and it helps you understand what each builder is pricing.
What about materials, VAT and exclusions?
Materials can account for a large part of a quote. If one builder includes mid-range tiles, sanitaryware and taps, and another prices “fit only” or uses a low material allowance, the totals will diverge even if labour is identical. Ask every builder to use the same allowance until you have chosen.
VAT is another frequent trap: one total includes it, another does not, or they apply different rates depending on what they assumed about your use of the property. Exclusions on the last page — debris, cleaning, licence fees, appliances — complete the picture. Align all three before comparing; our guide on comparing quotes includes a method.
Do builders simply charge different rates?
Yes, to some extent. A builder with a permanent team, insurance, a guarantee and an office has different costs from someone working alone and informally. A builder who is busy may price higher; one who needs work may price lower. Distance to the property, familiarity with the type of job and how much coordination they provide also play a part.
These differences are real but usually smaller than the ones above. Once scope, assumptions, quantities, materials and VAT are aligned, the remaining gap is often modest, and you can choose on the basis of trust, communication and how clearly each builder explains their quote.
What should you do with very different quotes?
Take them as information rather than as a verdict. Each one shows you how a professional interpreted your project. Use the differences to ask better questions, refine your brief and, if needed, ask for revised quotes on the same basis. If one quote stands out as far lower than the rest, find out what it leaves out before deciding.
If you would like us to quote on the same basis as others you have received, send them with your request; we will price the same scope and point out where our assumptions differ. For how a whole renovation breaks down, see full renovation cost.
Bauman Raymond Attila · Presupuesto Reforma · Avenida Antonio Belón 3, Marbella. Last reviewed: 05/11/2026.
