Cheap turns out expensive: but how expensive exactly?
It’s the most repeated saying in the renovation industry. And like all sayings, it’s said a lot but quantified rarely. How much does a cheap renovation actually cost when the problems start? What’s the probability of problems? And what kind of problems are they?
We’ve analyzed consumer claims data, warranty records from industry companies, and our own intervention database to provide answers with numbers. Not anecdotes, not “a friend of mine…” — data.
The result isn’t pretty for anyone seeking the cheapest option. But it’s real.
The baseline statistic: defect rate by price bracket
Of the bathroom renovations analyzed in the Valencia region (2022-2025 period), the rate of significant defects requiring repair within the first 24 months follows a clear pattern:
| Price bracket (medium bathroom renovation) | Defect rate within 24 months | Average claims |
|---|---|---|
| < 3,000 € (below P15) | 34% | 1.8 claims |
| 3,000-4,500 € (P15-P35) | 21% | 1.1 claims |
| 4,500-7,000 € (P35-P70) | 9% | 0.4 claims |
| > 7,000 € (above P70) | 5% | 0.2 claims |
Read that again: one in three renovations below 3,000 € presents defects requiring repair in the first two years. In the mid-range (4,500-7,000 €), that figure drops to 9%. The gap is enormous.
Data from the Valencia OMIC (Municipal Consumer Information Office) reinforces this trend. Claims in the home renovation sector rose 12% year-over-year in 2025, and the most frequent reason (43% of cases) was “execution or material defects.”
The 5 most frequent defects (and what they cost to repair)
Not all problems are equal. We’ve ranked the five most common defects by frequency and calculated the average repair cost.
1. Waterproofing failures (28% of claims)
The king of problems. Waterproofing is the layer that protects the structure from water, and it’s exactly the line item that cheap renovations cut or eliminate. It’s not visible, it doesn’t look impressive, and the client doesn’t know it’s missing until a damp spot appears on the neighbor’s ceiling below.
How it manifests: Damp patches on the ceiling below (if there’s a neighbor), musty smell, mold in joints, tile detachment in the shower area.
Time to detection: 6-18 months. Water seeps slowly through micro-cracks and takes months to become visually apparent.
Repair cost: 1,200-3,500 €. The affected area must be demolished, properly waterproofed, re-tiled, and damage to the apartment below repaired. If the neighbor files a claim, add 800-2,000 € for their ceiling repair.
Cost of doing it right from the start: 280-450 € (bituminous membrane or polyurethane in wet zone).
The math: saving 350 € on waterproofing can generate a 2,000-5,000 € expense. It is, literally, the perfect example of what at Bathscape we call “false economy.”
2. Loose or cracked tiles (23% of claims)
The second most frequent defect has two main causes: inadequate (or insufficient) tile adhesive and lack of expansion joints.
How it manifests: Tiles that sound hollow when tapped, cracks in grout lines, tiles detaching from the wall.
Time to detection: 3-12 months.
Repair cost: 600-1,800 €. If it’s an isolated tile, it’s replaced. If the problem is widespread (poor adhesive), the entire zone needs to be stripped and re-tiled. The problem: if your tile is discontinued, you need to find a compatible match — or redo the entire wall.
What fails in the cheap renovation: C1 (basic) adhesive is used instead of C2 (improved, deformable), applied with insufficient notch trowel (less contact surface), no perimeter expansion joints. All to save 2-3 hours of work and 40-60 € in materials.
3. Plumbing leaks (19% of claims)
The most feared problem and the one that can cause the most cascading damage.
How it manifests: Visible dripping at accessible connections, damp patches on walls or floor, abnormal increase in water bill, damage to the apartment below.
Time to detection: Variable. A leak at an accessible connection is detected in days. A leak in a concealed pipe can take 12-24 months to manifest.
Repair cost: 400-4,000 €. The range is huge because it depends on location. An accessible leak: 150-400 € (plumber + materials). A concealed leak behind tiling: demolish, repair the pipe, waterproof, re-tile. Easily 2,000-4,000 €.
What fails in the cheap renovation: Unsoldered connections (only Teflon tape and hand-tightened), inferior quality pipes, no pressure testing before closing up the wall.
4. Electrical defects (16% of claims)
Less frequent but potentially the most dangerous, because an electrical problem in a wet zone has safety implications.
How it manifests: Switches that give a shock, circuit breakers tripping when turning on the bathroom light, non-functional outlets, missing earth connection.
Time to detection: Immediate to 6 months.
Repair cost: 300-1,200 €. If the wiring is accessible (in conduit), it’s straightforward. If it’s concealed and wall needs to be opened to access it, the cost multiplies.
What fails in the cheap renovation: Unlicensed electrician, insufficient cable gauge, no dedicated circuit breaker for the bathroom, switches placed in zones prohibited by the REBT (Low Voltage Electrical Regulation). According to OCU data, 22% of inspected bathroom renovations had some electrical irregularity.
5. Poor finishing (14% of claims)
The “minor” defect in terms of risk, but the most visible and the most frustrating.
How it manifests: Irregular or quickly-blackening silicone joints, uneven grouting, poorly resolved wall-floor junctions, unlevel vanity, shower screen that doesn’t close properly.
Time to detection: Immediate to 3 months.
Repair cost: 200-800 €. Generally punctual corrections, but they require a professional and sometimes disassembly and reassembly of elements.
What fails in the cheap renovation: Rush. Finishing work requires time, patience, and craftsmanship. When the budget is very tight, the installer’s margins are minimal and the temptation to hurry is maximum. The result: a bathroom that looks fine from two meters away, but at half a meter betrays the lack of care.
The calculation nobody wants to do
Let’s put it all together with a typical case. Two scenarios for the same medium bathroom of 5-6 m² in a 1980s apartment in the Jesus neighborhood.
Scenario A: Cheap renovation (2,800 €)
- Initial price: 2,800 €
- Probability of defect within 24 months: 34%
- Average repair cost if defect occurs: 1,800 €
- Expected repair cost: 2,800 x 0 + 0.34 x 1,800 = 612 €
- Total expected cost: 3,412 €
Scenario B: Standard renovation (5,800 €)
- Initial price: 5,800 €
- Probability of defect within 24 months: 9%
- Average repair cost if defect occurs: 700 €
- Expected repair cost: 0.09 x 700 = 63 €
- Total expected cost: 5,863 €
“But 5,863 is still more than 3,412,” you might say. And you’re right in absolute terms. But what this calculation doesn’t capture is:
- The standard bathroom lasts 15-20 years without intervention. The cheap one needs repairs every 3-5 years. Projected over 15 years, the total cost of the cheap option exceeds the standard.
- The stress, disruption, and time of having construction in your bathroom a second time are priceless, but real.
- If a leak damages the neighbor’s apartment, the cost can spike to 5,000-8,000 € from a single incident.
At Bathscape, we see this more often than we’d like: clients who come asking for a second renovation because the first one — the cheap one, the “let’s see how it goes” one — lasted three years.
What to look for in a quote to avoid problems
Five red flags in a bathroom renovation quote:
1. No mention of waterproofing. If it doesn’t appear as a separate line item, either they’re not including it or they consider it unnecessary (it’s not).
2. No specification of adhesive type. “Tile installation” says nothing. It should indicate C2 or equivalent for wet zones.
3. No pressure test included. If plumbing is being renewed and there’s no line item for leak testing, that’s a bad sign.
4. The price is more than 30% below the median. Check our real cost analysis to see the medians. A quote 30% below is cutting something — and that something is usually labor or invisible line items.
5. No written warranty offered. A 2-5 year warranty on labor is standard from serious companies. If they don’t offer one, they’re indirectly saying they don’t trust their own work.
At Bathscape, our warranty covers materials and labor, and we formalize it in writing before work begins. We believe that if a company isn’t willing to stand behind its work, the client should ask themselves why.
The alternative: fixed price with everything included
The fixed price model exists precisely to eliminate these risks. When you receive a fixed price from Bathscape through the configurator, that price includes all line items — waterproofing, proper adhesive, pressure testing, waste management, everything.
There are no surprises because there are no hidden line items. There are no “extras” because everything is accounted for. And there’s no temptation to cut invisible corners because the price already covers them.
It’s our model, and we’ll defend it without hesitation: a transparent renovation with a fixed price and written warranty is better than a cheap renovation without any of those three things. The claims data confirms it.
To see the full process, visit how it works or configure your renovation directly in our configurator.
Frequently asked questions
What percentage of cheap renovations have problems?
According to our analysis, 34% of bathroom renovations below the 15th percentile in price present defects requiring repair within the first 24 months. In the mid-price range, that figure drops to 9%.
What’s the most expensive defect to repair in a bathroom renovation?
Concealed plumbing leaks are the defect with the highest potential cost, reaching 4,000 € if tiling must be demolished to access the pipe and repair damage to adjacent properties. Waterproofing failures are the most frequent, with an average repair cost of 1,200-3,500 €.
How do I know if a cheap quote is reliable?
Verify that it includes the five critical line items: waterproofing, C2 adhesive, plumbing pressure test, electrical installation with certification, and written warranty. If any is missing or unspecified, the quote is incomplete and the “savings” will likely turn into future expense.
Is it worth paying more for a mid-range renovation?
The data is conclusive: the mid-range renovation (P35-P70) has a defect rate 3.8 times lower than the low-range (<P15). Projected over 15 years, the total cost of ownership for the mid-range renovation is lower than the cheap one due to accumulated repairs.
Want a quote where everything is included? Configure your renovation in the Bathscape configurator and get a fixed price with every line item detailed. What you see is what you pay — no hidden costs, no surprises, no “while we’re at it.”
