From factory loft to old town: shaping spaces that fit Winterthur
In short
An interior designer Winterthur plans the layout, light, built-in joinery and the sequence of trades – from a former workshop in the Sulzerareal to a Belle Époque flat in the old town. Fees run from 15–22 % of construction cost for a renovation to 12–18 % for new build, or 120–300 CHF per hour. In the core zones and for inventoried buildings the municipal heritage office has a say, which is why Winterthur projects benefit from involving a professional early.
Winterthur has two faces. On the Sulzerareal, former factory and locomotive halls turn into bright lofts with raw concrete slabs and industrial glazing; a few minutes' walk away, the old town and the Belle Époque quarters line up flats with moulded ceilings, box windows and creaking parquet. Switzerland's sixth-largest city with some 120'000 residents and less than 20 kilometres from Zurich, Winterthur draws families and commuters after a little more space for their money. Renovating here means juggling scales and materials that could hardly be more opposed – and it calls for someone able to translate both worlds into a liveable layout.
What this professional actually does
Between decoration and load-bearing structure lies a discipline of its own. The interior architecture professional plans not only colours and furniture but the space itself: layouts, daylight, non-structural walls, kitchens, bathrooms, built-ins and the sequence of trades. They think backwards from finished daily life to the bare shell – and coordinate what usually gets lost between the client, the joiner and the electrician. The difference shows in the result: a well-planned layout does not make a home more expensive, but noticeably larger, brighter and easier to live in – and that is what drives the value of the property over time.
- Works on the surface: furniture, textiles, colour
- Does not change the existing room structure
- No work on walls, services or layout
- Useful when the layout already works
- Designs the space: layout, light, built-ins, materials
- Moves non-structural walls, rebuilds kitchen and bath
- Writes tenders, coordinates trades and schedules
- Guides from first idea to handover
- Owns structure, envelope and building permit
- Needed for extensions, added storeys, structural work
- Signs for the building's structure toward the outside
- Works with the interior designer on larger projects
Why an interior designer Winterthur reads the city differently from Zurich
The Sulzerareal shapes Winterthur's renovation market like few places in Switzerland. The Sulzer brothers founded their works here in 1834, later joined by the Swiss Locomotive and Machine Works (SLM); production continued until 1989. Today the Lokstadt district is rising on the site, the first area in Winterthur to earn the 2000-Watt-Areal label. Cranes and halls give way to lofts – high volumes, exposed structure and an acoustic that demands its own answers.
A few hundred metres further on, another city begins: the large old town and the Belle Époque quarters, whose well-kept workers' housing estates earned Winterthur the Wakker Prize in 1989. Here it is about ceiling heights, historic floors, box windows and layouts drawn for the life of 1900. An interior designer Winterthur must be able to read both building types – the wide industrial space and the compartmented bourgeois flat – and know what can be changed in each.
The phases of a project
A renovation follows a fixed order. Knowing it means understanding what the fee pays for and at which points decisions are made that are expensive to change later.
Measuring the existing fabric, a conversation about use, budget and timeline. For older buildings, checking substance, damp and any suspicion of hazardous materials.
First layout options, material direction, lighting idea. This is where you decide which walls fall and how the space will work.
Execution drawings for joinery, kitchen, bath and electrics. Clarify permits and, in core zones or for inventoried objects, involve the heritage office.
Describe the works, gather offers, compare and award. The basis for a reliable cost estimate and a budget that holds.
Site supervision, coordination of trades, control of quality and deadlines through to final handover and snag clearance.
What does the support cost?
The fee depends on the effort and the type of project. Typical figures are 15–22 % of construction cost for a renovation, 12–18 % for new build or fit-out, or an hourly rate of 120–300 CHF for advice and partial mandates. The SIA fee scale gives reference points but has not been binding since 2020 – fees are agreed freely.
Fee by project type
On top of the fee comes the construction sum itself. Plan a reserve of 10–20 %: in renovation, overruns often reach 15–25 %, because what sits behind old walls rarely matches the plan. A transparent cost estimate drawn up after the award protects against nasty surprises far better than an early lump sum.
Thinking of converting a flat in the Sulzerareal or the old town? Tell us about your property – we will tell you honestly which professional you need. Compare architects in your canton
When bringing one in pays off
Not every project needs full support. Anyone repainting walls or swapping a sofa manages without a professional. But some situations make it worthwhile almost every time – because a mistake in the layout or in the order of trades costs more than the fee and can rarely be corrected afterwards.
- Changing the layout: moving or opening walls, reassigning rooms
- Fitting out a loft in the Sulzerareal, high volumes and open structure
- Rebuilding kitchen and bathroom completely, services included
- An older building with heritage value, in a core zone or the inventory
- Several trades that must be coordinated over time
- Letting or sale, where the space has to convince
Heritage, core zone and older buildings in Winterthur
For conversions in the core zones and on inventoried objects of communal significance, the municipal heritage office of Winterthur is responsible; for supra-communal monuments, the cantonal Zurich heritage office. An inventory listing does not amount to protection but establishes a presumption of protection – old-town façades may also fall under a protection ordinance. This does not mean nothing can change, only that interventions are agreed early with the relevant office. For any building predating 1991, a hazardous-materials survey for asbestos precedes the work, because asbestos-bearing materials were then built into adhesives, floors and boards. Clarifying this early avoids losing months and keeps the budget from slipping.
Typical duration per phase
In Winterthur we never design just a space, but its origin: a factory hall carries clarity and raw material, a Belle Époque flat demands respect for proportion and detail.
How to find the right person
Look for relevant training and references on comparable buildings. Professionals are organised in the VSI-ASAI association; training is offered at schools such as HES-SO, ECAL and HEAD. Ask for a clear scope-of-services agreement, visit projects completed in Winterthur, and check that the person truly knows your building type – loft or old fabric. A good first meeting settles budget, process and availability before any contract.
Your Winterthur project in good hands
From the factory hall in the Sulzerareal to the Belle Époque flat in the old town: tell us about your space, and let us plan the next step together.
Describe my projectFAQ
Typical figures are 15–22 % of construction cost for a renovation, 12–18 % for new build, or an hourly rate of 120–300 CHF. The SIA fee scale serves as a reference but has not been binding since 2020.
A decorator works on the surface, with furniture and colour. Interior design plans the space itself: layout, light, built-ins and the order of trades. The architect owns the structure, the envelope and the building permit.
It depends on the work. Non-structural internal changes are often permit-free, but in a core zone and for an inventoried object the heritage office must be involved. Clarify this early with the professional and the city.
Concept and preliminary design take 4–8 weeks, tender and award 3–6 weeks. The conversion itself runs 12–24 weeks for a flat and 16–30 weeks for a loft fit-out.
For buildings predating 1991, an asbestos survey precedes the work. Also plan a reserve of 10–20 %, as renovations often exceed budget by 15–25 %.