Paying for a construction project is a bit like kayaking down a river. If you set off without a compass, every little wave becomes stressful. With a well-structured Swiss construction payment plan , you stay in control, even when the project is unpredictable.
The idea isn’t to “block” the project. On the contrary, a good plan protects everyone: the tradesperson finances their purchases and labor, and the client doesn’t pay too early. The result: less tension, fewer arguments, and a smoother project completion.
In this article, we will lay out a simple method: useful advance payments, verifiable milestones, retention (or alternative), and clauses ready to adapt, including for capital gains and acceptance.
What a payment plan should secure (and what it should avoid)
A payment plan is not a “price list”. It is a mechanism of trust. It must align three things: scope (what is included), time (when it is done), and money (how much is paid).
The classic pitfall is paying “according to the schedule” instead of “according to actual progress.” If payments are triggered because it’s the 15th of the month, even though the electricity work hasn’t progressed, you’re essentially financing the delay. Conversely, if you withhold too much without justification, the company will compensate with safety margins or slow down to preserve its cash flow.
A healthy plan addresses concrete questions:
- Is the deposit used for purchases (orders, materials) or is it an advance without consideration?
- Does each deadline correspond to an observable milestone (work installed, tested, accepted)?
- What happens if an unexpected issue is discovered (load-bearing wall, asbestos, utility lines)?
- How do we handle the end: reservations, defects, alterations, guarantees?
In general terms, the question of the due date for deposits and the price often arises in practice. The Vaud Federation of Entrepreneurs provides a good summary of the principles and points to consider, which should be read to understand the contractual logic: due date for the price and deposits .
One last useful tip: separate what pertains to the contract (rules of the game) from what pertains to site monitoring (evidence). Without evidence, even a good contract becomes difficult to enforce.
Advance payments and milestones: pay for actual progress, not for hope
A reasonable deposit can be healthy. It allows you to place orders, reserve staff, and get started quickly. The problem begins when the deposit becomes an automatic habit, or when it far exceeds what the company initially commits.
A good guideline: the more complex the project (custom-made, multi-trade coordination, tight deadlines), the clearer the milestones need to be. And the simpler the project, the less complex the schedule can be.
The most common confusion stems from the vocabulary: “down payment,” “installment payment,” “progress invoice.” In real life, it’s easy to mix them up. Yet, the distinction is important, especially in case of a dispute. The explanation of the difference between installment payments and down payments (and why it changes the fate of the amounts paid) is detailed here: installment payments and down payments .
Before proposing a grid, describe “photo-compatible” milestones: if you can show it in a dated photo, it’s often a good milestone. For example: “tiles laid and grouted”, “electrical panel wired and tested”, “shower waterproofing validated by testing”.
Here is an example (which can be adapted) of a payment plan for an interior renovation. The logic is simple: you pay more when you see more.
| Step (verifiable milestone) | Example of % | What you check before payment |
|---|---|---|
| Start-up deposit (orders, team bookings) | 10 % | Planning, liability insurance, main order list |
| Demolition and removal complete | 10 % | Clean area, consistent measurements, before/after photos |
| Existing technical systems (plumbing, electricity, ventilation) | 20 % | Validated paths, basic tests, provisional “as-built” plans |
| Closures (partitions, screeds, waterproofing) | 20 % | Critical points checked (shower, thresholds, slopes) |
| Finishing touches (tiling, painting, woodwork) | 30 % | Visual quality, reservations listed if necessary |
| Balance due upon receipt (less any applicable deductions) | 10 % | Signed receipt, documents handed over |
The key point: if a milestone isn’t reached, we don’t “punish” it, we postpone the payment. It’s a thermostat, not a hammer.
Retention of guarantee, bank guarantee, escrow: which safety net should you choose?
The end of the construction project is where most of the risks are concentrated: touch-ups, minor defects, correction delays, and sometimes disagreements about quality. This is precisely where restraint (or an alternative) comes in handy.
A retention of guarantee involves withholding a small portion of the price (often an agreed percentage) for a defined period, then releasing it after any defects have been corrected. It is a simple process, but it must be properly regulated : amount, duration, conditions for release, and procedure in case of disagreement.
Some companies prefer to avoid withholding funds, especially when they have many purchases to finance. In this case, a bank guarantee or an escrow account can be used. When choosing, primarily compare speed, cost, and ease of execution.
This table helps to decide based on your project profile.
| Mechanism | Benefits | Disadvantages | When it’s relevant |
|---|---|---|---|
| Retention of guarantee | Simple, no bank fees, effective for alterations | Impact on company cash flow, possible discussions on release | Renovations, multiple lots, delicate finishes |
| Bank guarantee | Protects the project owner without tying up the company’s cash flow | Bank fees, negotiable terms, paperwork | Major projects, companies that refuse restraint |
| Consignment (third party) | “Neutral” money reduces tension in case of disagreement | More complex implementation, details to be determined | Construction projects with a high risk of litigation, co-ownerships, large budgets |
Another point that often comes up is payment deadlines and what happens when an invoice arrives, or when it remains unpaid.
Important note: a hold is not a “discount fund”. It is used to address listed defects, not to renegotiate the price afterwards.
Finally, remember this simple rule: the security mechanism must be proportionate. The more complex the reception area (custom-made, watertight, technical), the more a well-defined security system will prevent conflicts.
Clauses ready to be adapted for a clear contract (down payments, withholding tax, capital gains, acceptance)
A construction contract is like a recipe. If you leave the quantities to the chef’s discretion, you’ll never get the same dish. The clauses below are templates to be customized according to your project, your trades involved, and your risk tolerance. They are intentionally kept simple to be easily read and understood.
Advance payment and milestone clause (progress payments)
Text to be adapted: “The price is paid in installments according to verifiable milestones. Each invoice indicates the milestone reached, with dated photos and, if necessary, measurements. The client pays within X days of receiving a compliant invoice. In the event of a milestone not reached, payment is deferred until completion.”
Retention of guarantee clause (or alternative)
Text to be adapted: “A retention of X% is deducted from each invoice, capped at CHF X. It is released at the end of the agreed period, subject to correction of the defects recorded in the acceptance report. Alternatively, an equivalent bank guarantee may be provided.”
Addition clause and additional work (amendments)
Text to be adapted: “Any work not included in the initial quote is subject to a written amendment before execution, describing the content, price, VAT, and impact on deadlines. Without written agreement, the work is considered not ordered, except in documented emergencies for building safety.”
Late penalty clause (construction deadline)
Text to be adapted: “If the delay is attributable to the company, a penalty of CHF X per calendar day applies, capped at X% of the contract, after a grace period of X days. Delays due to late decisions by the client, documented unforeseen technical issues, or force majeure events extend the deadline.”
Late payment clause (invoices)
Text to be adapted: “In the event of an undisputed late payment, late payment interest will apply according to the Code of Obligations, from the due date. The company may suspend work after written formal notice and a period of X days.”
Acceptance clause and reservations
Text to be adapted: “The acceptance takes place on site, with a signed report. Defects and reservations are listed, with correction deadlines. The balance is due upon acceptance, less any withholding and amounts disputed with justification.”
If you are working on a project similar to an off-plan purchase (or a very structured renovation with payments in stages), you can also draw inspiration from the payment security strategies described here: off-plan purchase guide in French-speaking Switzerland .
Amendments, evidence, VAT: the simple method to avoid endless disputes
Disputes rarely arise from blatant fraud. They usually stem from gray areas: a decision made on the spot, a verbal “yes,” a missing photo, or a detail interpreted differently three weeks later. The solution is a simple but systematic routine.
Start with a basic principle: every change must be documented, either in writing or, these days, with a clear digital record, for archiving purposes . Even a short, one-page addendum is better than a vague exchange on WhatsApp. And if you prefer using WhatsApp, keep it for coordination purposes, then formalize the agreement with an addendum.
Here is an easy-to-reuse amendment template. It creates a clear record without turning the construction site into an office.
| Field | Expected content | Useful attachment |
|---|---|---|
| Date and reference | Amendment No. …, lot concerned | Initial quote |
| Description | What changes, where, and what are the limits? | Annotated photo (simple) |
| Price | Amount excluding VAT, VAT, amount including VAT | Priced offer |
| Deadline | Impact on schedule (days) | Updated schedule |
| Validation | Signature or written agreement, validation on a dedicated platform where applicable | Confirmation email |
Next, document everything like a pro, without spending all your evenings on it: dated photos once a week, a short meeting summary (who decides what, and by when), and measurements when a task depends on actual quantities. For sensitive areas, a photo before closing (utilities in a partition wall, waterproofing before tiling) avoids a lot of arguments.
Regarding invoicing, request that each invoice specify: the period covered, the milestone, the calculation basis, and the VAT (applicable rate, included or not). In Switzerland, ambiguity regarding “excluding/including VAT” quickly leads to misunderstandings. To prepare the overall budget, including reserves and financing methods, this page provides practical guidance: financing renovations and conversions .
Finally, keep a simple phrase in your contract: “No document, no payment.” It’s not aggressive; it just creates a healthy habit.
Important note (no jargon)
This article provides practical guidance, but it is not legal advice . For a significant project (large budget, co-ownership, tight schedule, technical risks), have the contract and guarantees reviewed by a professional (legal advisor, lawyer, or construction specialist).
Conclusion
A solid Swiss construction payment plan tracks actual progress, ensures project completion security, and manages changes. With clear milestones, a retention clause (or alternative), and well-documented amendments, you replace improvisation with simple rules. The best protection is often the most basic: write it down, date it, and check it on-site. So, does your next project already have its milestones, or is it still being handled “by feel”?
For a structured and clear renovation, visit our Collet Homes work process .
