What to look out for when planning a renovation in 2026

The most expensive renovation mistakes are made before the crew even arrives.

A renovation in 2026 is a different game from two or three years ago. Prices have gone up, finding a good crew is still something of a lottery, and on top of that there are new technologies and standards that cost you twice over if you ignore them at the planning stage.

The paradox is that the costliest slip-ups have nothing to do with a crooked tile. They happen earlier: in a badly calculated budget, a missing contract, a crew chosen at random and no documentation at all.

This piece is for anyone planning a renovation in 2026, from freshening up a flat to a full refit. Concrete numbers, no filler.

What a renovation costs in 2026

This is always the first question, and rightly so, because the budget shapes every other decision.

Based on data from our renovation calculator and current projects, a comprehensive renovation to a mid-range standard on the Warsaw market costs:

2,800 to 4,200 PLN per square metre.

Warsaw is the most expensive renovation market in the country and often sets the reference point for pricing in other large cities. For a 50 m² flat to a mid-range standard that works out at roughly 140,000 to 210,000 PLN. Rates in regional cities can be 10 to 25 per cent lower, though the availability of good crews there is often worse than in the capital.

Where the money actually goes

For anyone renovating for the first time the split usually comes as a surprise:

• •materials: 55 to 65 per cent of the budget,
• •labour: 35 to 45 per cent of the budget.

These proportions flip depending on the room. In a bathroom, labour often eats more than materials, because plumbing, waterproofing and precise tiling are slow, specialist work.

The most expensive zones in a flat

Two rooms consistently generate the highest cost per square metre:

• •kitchen (10 m²): roughly 32,000 to 45,000 PLN, because fitted furniture, appliances and installations all stack up here,
• •bathroom (6 m²): roughly 22,000 to 30,000 PLN for plumbing, tiles, fittings and waterproofing.

Small rooms, and yet they can swallow a third of the whole budget.

Budget for the number going up

The most common mistake we see is a budget calculated with no slack.

Real costs can exceed the original assumptions by well over ten per cent, and in extreme cases by a quarter or more. That is not pessimism, it is a pattern that repeats project after project.

We have watched it happen. In one flat, once the plaster came off, the entire electrical installation turned out to be aluminium and nowhere near current safety standards. Replacing it alone pushed the budget up by 18 per cent. Nobody had planned for it, and the bill still had to be paid.

Where overruns come from

The list is surprisingly repetitive:

• •hidden damp in the walls, invisible until the plaster comes off,
• •uneven floors that need an extra screed,
• •installations from a previous era that have to be replaced wholesale,
• •decisions changed mid-project,
• •late material deliveries.

The minimum contingency is 10 to 15 per cent. In a building from the 1960s or 1970s, keep closer to 20 per cent. A surplus is far more comfortable than a loan to finish the job.

Hidden costs nobody mentions at the start

A first estimate almost never includes:

• •rubble removal and a waste skip,
• •material transport, and there can be a dozen runs,
• •protecting the stairwell and communal areas,
• •the final clean,
• •renting somewhere to live while the work goes on.

That last one hurts the most. Every day of delay costs another 100 to 150 PLN in rent, so a two-week overrun quietly burns 1,500 to 2,000 PLN.

The contract: paper is everything

A huge share of renovations in Poland still runs on a verbal agreement, and that is one of the biggest risks you can take on. Without a written contract there is no leverage, no basis for a complaint and no proof that anything was ever agreed. In a dispute it comes down to one person's word against another's.

What a good renovation contract must contain

• •A detailed scope of work. Not vague phrases about renovating the bathroom, but metres, materials, models and colours. The more detail, the fewer misunderstandings.
• •A stage schedule. Strip-out, installations, finishing, with actual dates rather than approximate windows.
• •Payments tied to stages. A deposit of 10 to 20 per cent to start, instalments as stages complete, and 20 to 30 per cent held back until final handover. That retention is the only real guarantee the contractor will finish.
• •Penalty clauses. Between 0.1 and 0.2 per cent of the value for each day of delay. Without them, the schedule is a wish list.
• •Warranty terms. At least two years on the work carried out.

Red flags

If any of these come up in conversation with a contractor, it is worth looking elsewhere:

• •no schedule in the contract,
• •no penalty clauses,
• •a request for half the money or more up front,
• •no material specification,
• •a clause leaving materials to the contractor's discretion, which is practically an invitation to substitute them,
• •no stage handovers,
• •no requirement for photographic documentation.

Choosing a contractor: verify rather than trust

The renovation market has one chronic problem: an enormous asymmetry of knowledge. The contractor knows everything about renovation, and a first-time client knows almost nothing.

What to check before signing

• •Portfolio. Photos of completed projects, ideally with addresses you can verify.
• •References. Actual contacts for previous clients rather than anonymous reviews online.
• •Company registration. The public register shows whether the company exists and how long it has been trading.
• •Invoices. A professional bills properly.

We have come across cases where the invoice listed pipes from a well-known brand while a cheaper substitute went under the screed. Once it is covered, you cannot tell them apart. An invoice proves a purchase, not an installation, so without photographic documentation you cannot show that the materials you paid for ended up in your flat rather than on another site.

A simple professionalism test

Ask one question: what will you do if you find damp or crooked walls once the plaster comes off?

A professional will calmly describe the procedure: drying out, levelling, a supplementary estimate and telling the client the cost before any decision is made. An amateur changes the subject or says it will be fine.

Installations: the last place to economise

The figures can give you a headache:

• •electrics in a 50 m² flat: 9,000 to 14,000 PLN,
• •plumbing: 6,000 to 9,000 PLN.

A lot, until you compare it with the alternative. Replacing installations after the renovation, when freshly painted walls have to be chased, new tiles lifted and furniture moved out, costs 35,000 to 50,000 PLN plus the ruined finish. That is not a hypothetical, it is something we see regularly.

Think ahead, not just about today's budget

Even if you are not planning smart home, air conditioning, electric blinds, a car charger or heat recovery ventilation today, run the cables and pipes for them now. Adding a socket during a renovation costs 200 to 250 PLN. The same socket afterwards costs many times that, because a finished wall has to be chased open.

Seasonality: when to renovate

Spring and summer are the peak season. Crews have full calendars, prices are at their highest and terms are hardest to negotiate.

Autumn and winter work out better for availability and price, though you have to allow for plaster and screed drying more slowly, a slower pace of work and the risk of heating problems on site.

A realistic timescale for a 40 to 60 m² flat is 6 to 12 weeks, plus a buffer. Delays in renovation are not the exception, they are the norm.

Materials: who buys them

There are two models, and both have their traps.

When the contractor buys, it is more convenient but requires trust. Agree clear rules for settling material costs: the prices they are calculated at, what the margin covers and how deliveries are documented. A good contractor has no problem with a transparent material schedule.

When you buy, you keep full control over quality and price, but you take on the logistics: a dozen deliveries, storage and keeping to dates.

The most common problems in either model are inflated material prices, substitution with cheaper equivalents and late deliveries that stall the work. The rule of thumb is simple: document everything. Photos of packaging, labels, invoices.

Technology on a renovation

More and more clients now use:

• •smart home systems controlling lighting, heating and blinds,
• •site monitoring, meaning high-resolution cameras recording progress,
• •damp sensors in critical places,
• •reports generated by AI from photographs and sensor data,
• •time-lapse films documenting the whole course of the works.

Monitoring on its own raises the quality of the work through the observer effect. A crew that knows its work is being documented works more carefully. We see it in the data from our own projects.

Energy efficiency

If you are renovating anyway, it is worth considering:

• •wall insulation, which pays for itself in 5 to 8 years,
• •new windows, which improve both comfort and valuation,
• •heat recovery ventilation, cutting heating costs by 20 to 30 per cent,
• •additional acoustic and thermal insulation.

At current energy prices these outlays pay back faster than ever.

Documentation: a digital passport for your flat

This is the point most people skip and later regret. Document from day one:

• •the state before the works, with photos and measurements of every room,
• •installations photographed before they are covered: electrics in the walls, pipes in the floor, waterproofing,
• •materials, together with invoices and technical data sheets,
• •handovers, in the form of a report for each stage,
• •invoices, complete and in order.

We increasingly meet buyers who ask for photos of installations before they were covered, particularly at the premium end of the market. Missing documentation is a warning sign to them.

Good renovation records do three things: they raise the value of the flat, they speed up a future sale and they protect you in a dispute with the contractor.

Checklist before you start

Before you call the first crew, make sure you have:

• •an estimate with a contingency of at least 15 per cent, or 20 per cent in older buildings,
• •a written contract covering the full scope of work,
• •a schedule with real dates and penalty clauses,
• •a verified contractor: portfolio, references, registration,
• •agreed rules for buying materials,
• •a plan for future-proofing installations,
• •a documentation plan covering who photographs what and when,
• •a time buffer of at least two weeks beyond the planned date.

In summary

A renovation in 2026 is an investment project, not just an aesthetic one. It calls for financial planning, control over contractors, proper documentation and some thought about technology.

With the right preparation it does not have to be traumatic. It can be a process you genuinely control.

Want to estimate the cost of your own renovation? Use the renovation calculator, quickly and with no obligation.