Also in pictures
The same analysis as a compact picture series: one image per mistake, swipeable on your phone.
Open the picture seriesThe comparison illustration is a schematic, AI-generated image. About our images.
Foreword
Hello,
I'm Rusi Kolev, architect and founder of Kolev Architektenküchen. For many years I have been planning and building kitchens in the premium segment: in our own production, panel by panel, and with our own installation team.
What I have seen again and again over this time: the most expensive mistakes when buying a kitchen don't happen during installation. They happen in the very first conversations. Long before anyone has paid a single euro.
This short guide is not a sales brochure. It contains five concrete mistakes I see with almost every new client at the start, and which typically cost between €2,000 and €15,000, often without the buyer noticing.
If you read this guide in the next five minutes, you will negotiate differently. And you will ask the right questions in your initial consultation, not only of me, but of every other kitchen company you consider.
Best of luck with your project.
Rusi Kolev
Mistake 1 of 5
The biggest illusion in the kitchen industry. And the most expensive.
When a kitchen studio says "we build custom", it often means: industrial modules plus filler panels. The actual cabinet bodies, the load-bearing carcases of your kitchen, come from serial production in three or four standard widths. Wherever these modules don't quite fit your room, side fillers or cover panels are used. Between 5 and 25 centimetres per side, depending on how far the room deviates from the next module grid.
This sounds like a technical detail. In truth it means: a filler panel in the front material is visibly placed between the cabinets and your wall. The same on the worktop edge. The same above the wall units.
The result: a kitchen that looks as though it has been placed into a room out of a catalogue, not as if it had been built for that room.
After two weeks you no longer see the kitchen. You see the panels. Every morning.
Before founding Kolev Architektenküchen, I ordered kitchens from classic studios as an architect for my building clients. Every time it bothered me how many filler panels, cover strips and masking pieces were needed just to get standard modules to sit next to each other in the room. That was the very reason I started building kitchens myself.
Every Kolev kitchen is built to the millimetre for your room. No standard module. No filler strip. Air gap to the wall: 3 to 5 mm instead of 5 to 25 cm filler panels pretending the kitchen was custom-built. The carcases are made in our own Manufaktur, to the actual measurements of your walls, which we measure in 3D before production: 0 mm deviation from the plan, 3 mm front gaps.
The difference is visible at first glance, and even more at the tenth. When you stand next to your worktop in five years' time, you will either see a clean continuous line or a strip of filler. That decision is made today.
An industrial-with-panels solution looks cheaper at first glance. In truth you pay for unused storage and for an aesthetic compromise you will see daily for 20 years. How to recognise a genuine made-to-measure kitchen is set out in detail in our guide.
Ask every supplier:
Mistake 2 of 5
You don't know what your hob really costs.
The appliance price in a kitchen offer carries an often significant mark-up, whether for your BORA hob, your Miele oven or your Quooker: industry practice, legitimate and invisible to many buyers. Check the appliance price against a price comparison site such as idealo.de.
Every retail business calculates a margin, and that is fine. But appliance prices often disappear into a total sum in the offer, and a mark-up you cannot see is one you cannot compare.
We are a direct architect partner of BORA, Quooker, Elica and Küppersbusch and pass the terms on without our own mark-up. No hidden margin on the appliances: for BORA and Quooker, every offer shows the manufacturer's RRP next to our price.
Worked example from a real client kitchen (RRP according to the manufacturer, as of September 2026):
| Appliance | RRP | Your Kolev price |
|---|---|---|
| BORA X Pure (hob + downdraft) | €3,915 | €2,545 |
| Quooker Flex + CUBE | €2,595 | €1,687 |
| Difference to RRP for these two appliances | €2,278 |
A typical kitchen includes 4 to 6 branded appliances. Your advantage against the RRP adds up accordingly.
This difference is not the result of haggling. We source the appliances directly from the manufacturer and pass the terms on without our own mark-up, as part of your kitchen planning. We earn nothing on your appliances. Our business earns on the build.
Why is the market so opaque on this point? Because manufacturers don't publish their partner terms. The buyer sees a price in the offer, has no reference and accepts it as market-standard. A simple test: ask every supplier to show the RRP of every appliance and your price in two separate columns of the offer. A supplier who calculates fairly does so without discussion. How we list existing and new appliances separately in the offer is shown in the guide Fitting your own appliances.
Ask every supplier:
Mistake 3 of 5
The offer was €32,000. The final invoice was €37,400. No one defrauded you, and that is exactly the problem.
The difference didn't arise from a mistake. It arose from line items that weren't in the offer, or only as vague phrasing: "site preparation insufficient" (+€800), "special-size carcase" (+€1,200), "material no longer available, replacement more expensive" (+€600), "fitter hourly rate above flat assumption" (+€2,100), "extra effort delivering to upper floor" (+€700). Individually each line sounds plausible. Together they are €5,400 more than expected.
It is industry practice. That doesn't make it acceptable.
Final invoices that lie significantly above the offer have their own thread in German construction and trade forums. The range goes from 15-20 % overruns (barely tolerable under prevailing case law without a separate disclosure obligation) to individual cases of more than double the original estimate. Not necessarily unlawful. It is the consequence of an offer you signed without a fixed-price binding.
The order confirmation carries a clear amount. You sign. What gets added between your signature and the final invoice you do not know at that point. Three typical items that are vague or simply missing in the offer:
Each of these items is defensible on its own. Together they produce the typical final-invoice gap of €5,000 to €15,000.
My final invoice equals the offered sum. Full stop. The installation is listed as a fixed euro amount in the offer, not as "by effort". Genuine special cases of delivery logistics (crane operation, particular access routes) are listed in the offer as conditional line items with euro amounts in advance. You know the maximum before you sign.
Order confirmations from me are copies of the accepted offer, line by line, supplemented with the delivery address and bank details. Substantive changes, if there are any, only as an amendment in text form, never as silent edits in the running text. On top of that, a payment plan in which every instalment follows a step you approve yourself: 20 per cent after the order confirmation, 65 per cent after your planning approval and before production starts, the last 15 per cent only after acceptance. We do not offer a bank guarantee. How the payment plan works in detail is shown in the guide Kitchen deposit and payment plan.
Ask every supplier:
Mistake 4 of 5
"If you sign today, the home-show price still applies." That single second is the most expensive in the entire purchase process.
You sit in the studio, the kitchen has been planned, the consultant places the offer in front of you. Then comes the line: only until Sunday. Only because you are here today. Only because the home show is still running. That one line stands between your kitchen plan and three quiet weeks of comparing the market. It is the moment when many buyers pay more than necessary, because they have stopped comparing.
The mechanism behind it: "home-show price", "only until Friday" and "special conditions for current projects" are tools to push the close into the current week. Industrial kitchens are made to order: there is no scarcity. No Siemens oven goes out of production because you don't sign today. The pressure is psychological, not logistical.
A kitchen between €14,999 and €80,000 is a decision you will feel daily for 20 years. No show price is worth as much as three quiet weeks in which you compare, ask and verify. Hasty signatures under sales pressure have never helped anyone get a good kitchen.
On public review portals for kitchen studios, the recurring lines are striking: "Better not to sign at all." "The most expensive signature of my life." "Agreements made at the trade show are invalid afterwards: no right of withdrawal, only cancellation fees of 30 %." These are not isolated opinions. It is a recurring pattern at suppliers who work with sales pressure.
Get three offers before you sign. We are one of them. Not because the first offers are bad, but because only the third comparison shows where individual items realistically sit: appliance prices, installation flat rates, worktop costs. Without a comparison you cannot tell whether €32,000 for your configuration is market-appropriate, too high or low.
The third comparison is the most valuable. Whoever lets it pass through a hasty close pays the price for it in the final invoice or in the bad feeling at the last look at the signed document.
My offer is a fixed price, in writing, valid for three weeks, with no bonus structure and no special conditions for a same-day signature. The process explicitly assumes you will obtain further offers. We have no second price, which is why the first one is the best. Which questions to put to every offer is set out step by step in our kitchen buying guide.
Ask every supplier:
Mistake 5 of 5
Your daughter rams the front with her high chair. What does the repair cost, and how long does it take?
A damaged front is everyday life in a lived-in kitchen. Children, bicycle helmets, the corner blow of a heavily loaded shopping basket: most scratches and dents arise not through negligence but through normal use.
In an industrial kitchen, the repair runs like this: you contact the studio. The studio contacts the manufacturer. The manufacturer checks whether the decor is still in current production. If yes: lead time 6 to 14 weeks for a single front. If no (and decors are regularly discontinued, often after 5 to 8 years), then there is no longer a single replacement front. Then all fronts in a row must be replaced so the visual line stays consistent. A damage with a material value of €200 turns into a repair of €3,000 or more.
This is not an exception. Decors are discontinued by market logic, at every manufacturer. What matters is what your supplier still has in hand at that point: the workshop drawing of your kitchen, or just an order number from series production.
In German kitchen and renovation forums, similar reports appear regularly, usually with the same key sentence: "The fronts haven't been available from this supplier for a long time." Anyone wanting to replace a single front in an eight-year-old kitchen often faces exactly that line.
Every front is made from the stored construction data of your kitchen: cut on our panel supplier's CNC mill, built in our own Manufaktur. A single replacement front is remade from the archived workshop drawing in the same coating, the same dimension, the same profile, in 6 to 14 weeks, as long as the decor is available. If it has been discontinued, that affects every manufacturer, including us: what remains is a closed replacement of the row or a planned mix of materials.
I keep the construction data of your kitchen permanently as a BIM file: the complete three-dimensional model of your kitchen, with every dimension, every coating, every profile. That is the decisive difference: the size, profile and build-up of your fronts stay documented even after ten or fifteen years, and as long as the decor is available, I remake a front matching in size and colour. What a replacement front costs and when a swap pays off is covered in the guide Replacing kitchen fronts.
A selection of the brand-name appliances from BORA, Quooker, Elica and Küppersbusch is shown in the appliance catalogue. The prices there apply as part of a kitchen planning. What a real renovation of an existing Frankfurt home with three wall constraints looks like is documented in the Frankfurt Renovation reference project. More about me as an architect (AKH).
Ask every supplier:
Frequently asked questions
The five described in this guide: 1) "custom-built" is not always custom-built (industrial modules plus filler panels), 2) hidden margin on appliances (an often significant mark-up you cannot see in the offer), 3) the final-invoice trap (€5,000 to €15,000 above the offered sum), 4) sales pressure and the missing three-offer comparison, 5) front damage without BIM data storage (€200 of damage becomes a €3,000 repair). The PDF guide "The Twelve Costliest Mistakes" adds a further seven.
Architect's conditions is the name Kolev Architektenküchen uses for its trade-partner terms on brand-name appliances from BORA, Quooker, Elica and Küppersbusch, sourced directly from the manufacturer with no wholesaler in between. These terms are not reserved for architects. At Kolev Architektenküchen they are passed on to the buyer as part of the kitchen planning, without our own mark-up. For BORA and Quooker, the offer shows the manufacturer's RRP next to the Kolev price. Whether another supplier adds a mark-up to its own terms is only visible when the RRP and the price are shown separately in the offer. Check the appliance price against a price comparison site such as idealo.de. A selection of the appliances is shown in the appliance catalogue.
A fixed-price commitment confirms in writing that the final invoice equals the offered sum. Special cases (such as a crane or transport without a lift) are listed in advance as conditional line items with euro amounts in the offer, so the maximum is known before signing. Order confirmations are copies of the accepted offer, not deviating documents. Substantive changes only as an amendment in text form.
Once a front decor is discontinued, no front can be made in that decor any more, by any manufacturer, including us. What remains is a closed replacement of the whole row (from around €3,000, against around €200 material value for a single front) or a planned mix of materials. As long as the decor is available, we remake a single front from the permanently archived workshop drawing (BIM file), matching in size and colour, in 6 to 14 weeks. What this looks like in a real renovation is shown in the Frankfurt Renovation reference project. Further answers in the detailed FAQ section.
Put the questions to your suppliers. Get three offers. We are one of them. Compare in your own time.
Then use the questions as a checklist for every initial consultation, including ours.
The initial consultation is the next step: 60 minutes by video, directly with the architect, free of charge and without obligation. You ask the questions from this guide, I give you a realistic assessment: honestly, with no sales pressure.
"Everything could be fitted exactly. No filler panels needed."
Jacqueline W. · Frankfurt · Google review (translated)
"Mr Kolev takes the time to go into countless small details: materials, colours, spacing, heights, technical finesse, lighting."
Micha S. · Frankfurt · Google review (translated)
Your next step
Book your initial consultation.
60 minutes with the architect. Free of charge and without obligation.
Personal. Free of charge. No sales pressure.
Best of luck with your project, whether you build with me or with someone else in the end.
Rusi Kolev
Architect (AKH) · Real-Estate Economist (ebs)
Kolev Architektenküchen · kolev-kuechen.de