Most people work out what a renovation costs only once the crew is already on site. That is the most expensive possible moment to decide anything — every change then costs 2-3 times what it would have cost on paper.
Problem
The typical sequence looks like this: you sign for the flat, call two crews, get two numbers 40,000 PLN apart and pick the lower one. Your budget is created at that moment — out of a contractor quote rather than out of your own analysis.
The problem is that a contractor quote is not an estimate. It is a sales document. Its job is to win the contract, not to show you the full cost of getting the flat to the state you actually want to live in.
Here is what happens when the budget is planned mid-renovation:
— You lose your reference point. You cannot tell whether 92,000 PLN for 58 m² is fair or inflated by 25%. Without a number of your own, you adopt somebody else's. — Decisions get made under time pressure. The crew is waiting on your tile choice because adhesive and grout orders depend on it. You decide in two days what deserved two weeks. — Changes cost many times more. Moving a socket on paper is zero. Moving it after the screed is poured and the tiles are laid is 800-2,500 PLN and a week of delay. — There is no way to finance the overrun. The real number surfaces in week 6-8, once the loan is drawn and the savings are committed.
In 2026 this hurts more than it used to. Labour rates are up 12-18% year on year and the wait for a good crew runs 4-10 weeks. You can no longer simply buy a slot or a crew mid-season.
Solution
What an estimate prepared in advance actually gives you
1. A negotiating benchmark. Once you know the market range for your scope is 78,000-92,000 PLN, a 115,000 PLN quote stops being the market price and becomes a conversation. Without your own number, your only argument is that it feels too expensive.
2. The right sequence of work. The biggest renovation costs come not from material prices but from doing things in the wrong order. Electrics and plumbing must be finished before the screed. Underfloor heating before the floor finish. Ventilation before the suspended ceiling. Building an estimate forces you to think that sequence through before anybody starts opening walls.
3. Deliberate scope trimming. When you can see the cost of each element before you start, you can decide to do the bathroom and kitchen this year and leave the living room for next year. Make that same call mid-works and you pay for two crew mobilisations instead of one.
4. Realistic financing. A bank assesses your borrowing against the number you give it. An estimate built 2-3 months before the start lets you apply for the right amount once, instead of asking for an increase halfway through.
What a late decision costs — 2026 market examples
| Change | Cost at planning stage | Cost mid-works |
|---|---|---|
| Moving an electrical point | 0 PLN | 400-900 PLN + delay |
| Dropping underfloor heating | 0 PLN | 3,000-8,000 PLN (breaking up screed) |
| Changing tile format | 0 PLN | 60-140 PLN/m² labour surcharge |
| Adding a partition wall | 0 PLN | 1,800-4,000 PLN + services rework |
| Changing the kitchen layout | 0 PLN | 2,500-9,000 PLN (plumbing, electrics) |
When to start planning
The optimal window is 2-4 months before the planned start. That leaves enough time to build the budget, sanity-check it against 2-3 contractors, book a crew for a specific date and order long-lead materials (large-format slabs, joinery, imported fittings).
Three levels of estimate accuracy
Level 1 — indicative (15 minutes). A rate per m² multiplied by area and a city coefficient. Enough to judge whether the renovation fits your means at all.
Level 2 — room by room (1 hour). Every room costed separately, accounting for finish standard and the condition of the services. This is the level at which a conversation with a contractor becomes substantive.
Level 3 — itemised (a quantity surveyor's job). A breakdown into specific line items with measured quantities. Needed above roughly 150,000 PLN, for a renovation loan, or in a dispute with a contractor.
For the large majority of flats, level 2 is entirely sufficient — provided it exists before the first conversation with a crew, not after it.
Checklist
- Build the estimate 2-4 months before the planned start date
- Measure every room separately — the area on the deed is not enough
- Fix the finish standard for each room before costing it
- Check the condition of the electrics and plumbing — that is 15-25% of the budget
- Plan the sequence: services, screeds, plaster, finishes
- Add a 15-20% reserve for what appears once old layers come off
- Have your own number BEFORE the first contractor conversation
- Book the crew 6-10 weeks ahead (2026 season)
