Why the process matters in a renovation
Unlike a new build, much of a renovation is hidden: old pipes, unknown load-bearing structures, hazardous substances in building components. Without a clear sequence, change orders, delays and misunderstandings between client, planners and tradespeople arise quickly. A structured process ensures that important decisions are made at the right time and surprises come to light early.
The most expensive changes are those decided only on the building site.
The ten steps at a glance
- Clarify goals and budget: what should the renovation achieve, what is essential, what is desirable, and what cost framework including contingency is realistic?
- Choose partners: decide whether to work with an architect, a general contractor or individual tradespeople, and ask for references.
- Survey the existing building: a site visit assesses condition, structure, building services and connections.
- Compare options: set two or three solutions against each other by cost, benefit, design and construction time.
- Check for hazardous substances: in older buildings, have suspicious components examined before work starts.
- Obtain and compare quotes: define the scope clearly so that offers are comparable.
- Obtain the permit: submit a building application or notification to the municipality and allow for deadlines.
- Strip-out: remove components no longer needed professionally and dispose of waste correctly.
- Execution and site management: continuously coordinate and document work, schedules, quality and costs.
- Acceptance and handover: joint inspection, defects list, documentation and warranty papers.
The first steps offer the greatest leverage. A thorough survey of the existing building and an honest comparison of options cost little relative to the construction budget but prevent expensive design changes during execution. Cutting corners here is usually paid for later through change orders. Record every important decision in writing so that everyone involved works from the same basis.
Plan costs and contingency realistically
In a renovation, cost estimates are inherently less certain than in a new build. Many professionals therefore recommend a contingency of around ten to fifteen percent of the construction cost, and more for older buildings. Check whether quotes contain fixed or indicative prices and which services are explicitly excluded.
Builders' lien
Tradespeople and subcontractors can have a lien registered on your property if they are not paid, even if you have already paid the general contractor. Agree payments according to construction progress and ask for confirmation that subcontractors have been paid, or require suitable security.
Permits, hazardous substances and neighbours
Whether a renovation requires a permit is governed by the canton and municipality. Work affecting the facade, load-bearing structure, use or floor plan usually needs a permit; purely interior work often does not. Clarify this early with the building authority, as a procedure with objections can take months.
- Asbestos was used in Swiss buildings until 1990. In older buildings, a hazardous-substance survey by specialists before strip-out work is sensible and in many places a condition for the permit.
- In condominium ownership, work on common parts requires the consent of the owners' community according to its regulations.
- Inform neighbours and, for let properties, tenants early about duration and noise.
One partner or separate contracts
| Model | Advantages | Disadvantages |
|---|---|---|
| General contractor | One contact, cost and schedule responsibility from a single source | Less insight into individual prices, coordination mark-up |
| Architect with separate contracts | Independent representation of your interests, price transparency | More interfaces, additional fee |
| Direct contracts with tradespeople | Cheap and quick for small renovations | Coordination and risk lie with you |
Which model fits depends on the size and complexity of the project and on how much time and expertise you can contribute yourself.
Acceptance and warranty
Acceptance is legally important: from this point, notice and limitation periods begin to run. Inspect the work together with the site manager, record all defects in the protocol and agree deadlines for remedying them. Many Swiss construction contracts are based on SIA standard 118, which provides for a two-year notice period; for defects in immovable works, the Code of Obligations generally sets a limitation period of five years. Which rules apply in a given case depends on the contract; if in doubt, legal advice is worthwhile.