Engineering office for HVAC & building services · Urdorf ZH
Building Services Engineering.
Thought Through to the Last Detail.
Professional building services engineering for refurbishments, conversions and new developments — personally managed and 100 % in-house.
- 100 % in-house
- Personal project leadership
- Refurbishment, conversion & new build
- Response within 72 h
Free initial consultation · Sample quotation: available soon
BIM · HVAC coordination
Digital coordination for fewer interface conflicts and smoother project delivery.
- 0+
- years of professional experience
- 0+
- projects completed in earlier professional roles
- 0+ m²
- commercial & industrial floor area
- 0 %
- in-house design
Core disciplines
Four disciplines. One office.
Heating, ventilation, cooling and sanitary systems are designed together and coordinated in the same model. That prevents interface losses exactly where they are most costly: in existing buildings and on site.
Heating
Heat generation, distribution and emission — sized to actual demand, not rules of thumb.
Ventilation
Comfort and process ventilation, from airflow calculation to ductwork routing in existing buildings.
Cooling / air conditioning
Radiant cooling ceilings, convective chilled beams or fan coils — compared on investment, operation and acoustics.
Sanitary
Drinking water, drainage and riser zones — routed hygienically, space-efficiently and easy to service.
Focus areas
Renovation, conversion and new build — from residential to industrial buildings.
Building services renovation
Renewing heating, ventilation and sanitary systems during ongoing operation — staged, coordinated, with a clear view of building fabric and use.
Heating system replacement
Heat pump, district heating, wood, gas or hybrid — compared without technology bias, correctly sized and documented for funding eligibility.
Commercial & industrial
Office, commercial and production spaces with process heat, air conditioning and demanding ventilation and sanitary systems.
Why Rohner
Clear responsibility.
Five principles that shape every project — from the first assessment to commissioning.
- 01
Personal project leadership
You speak directly with the engineer working on your project — no hand-offs, no lost information.
- 02
100 % in-house
Design, coordination and tendering are handled entirely within our own office. No outsourcing, one point of responsibility.
- 03
Economically planned
Investment, operation, maintenance and energy are considered together — decisions are made over the full lifecycle.
- 04
Model-based
Consistent work in Trimble Nova: coherent data, coordinated design stages, traceable quantities.
- 05
Transparent
Fees, assumptions and cost derivations are documented. No reserve items, no hidden costs.
How we work
Five clearly defined phases.
- 01
Analysis & requirements
Initial conversation, on-site survey, clarifying use and objectives. Free of charge and non-binding.
- 02
Concept & variants
System comparison with a rough cost estimate based on experience values.
- 03
Design & engineering
Construction and execution planning, sizing and discipline coordination — model-based.
- 04
Tendering & procurement support
Model-based bills of quantities, quotation review and award recommendation.
- 05
Execution & commissioning
Site supervision within the agreed scope, acceptance, commissioning and documentation.
Cost transparency
The lowest price is rarely the most economical system.
We evaluate systems over their entire lifecycle. Only the sum of investment, operation, maintenance, energy and service life shows which solution is economical — and makes the value of good engineering measurable.
Request a rough cost estimate- Investment
- System size and technology choice determine construction cost — not a catalogue price for a single unit.
- Operation
- Temperature levels, control strategy and hydraulics determine energy consumption.
- Maintenance
- Accessibility and component choice determine the maintenance effort over decades.
- Service life
- Replacement cycles and staging are planned in advance instead of causing surprises later.
Founder
Direct Contact. Short Communication Lines. Personal Responsibility.
Patrik Rohner has worked in building services engineering since 2014 and leads Rohner Engineering as an engineering office with short decision paths. Enquiries, sizing and coordination stay in the same hands — you always know who is working on your project.
Project types from earlier professional experience
- Single-family homes
- Renovation, heating system replacement and new build with tight space constraints.
- Multi-family buildings
- Staged renewal in occupied buildings, riser zones and hot water concepts.
- Commercial & industrial buildings
- TABS, displacement and mixed ventilation, chilled and heated ceilings, process systems.
These projects were carried out by Patrik Rohner in previous employment. They represent individual professional experience, not company references of Rohner Engineering GmbH.
About usWho we plan for
Clients, operators and design partners.
Private clients
Owners renovating, converting or building new — advised independently, without ties to any manufacturer.
Housing cooperatives & administrators
Focus on long-term affordable housing and low operating costs over the full lifecycle.
Commercial & industrial operators
Operators of office, commercial and production spaces with demanding building services.
Architecture & design partners
Clearly defined interfaces, coordinated design stages, a direct line to the responsible engineer.
FAQ
Frequently asked questions.
Your question isn't here? Get in touch — we will respond to your project enquiry within 72 hours.
Discuss your projectAs early as possible — ideally during the preliminary study or the initial project phase. This is when system choice, space requirements, riser zones and temperature levels are decided, shaping investment and operating costs for decades to come.
Needs assessment, concept and variant studies, design and engineering, construction and execution planning, discipline coordination, cost estimation, tendering, quotation review, and site supervision through to commissioning — individual phases or the full engineering scope, depending on the mandate.
Yes, and we do so with an open, technology-neutral approach. Heat pump, district heating, wood, gas or hybrid systems are compared based on heat demand, distribution system, space constraints and lifecycle cost. We don't recommend any technology by default and are manufacturer-independent.
Floor plans and sections (PDF, DWG or DXF) are helpful, along with the building's construction year, use, existing system descriptions and recent consumption data. For an initial assessment, a short project description is often enough.
We will respond to your project enquiry within 72 hours — with an initial assessment of scope and approach. The first conversation, an on-site survey and preparing an offer are free of charge and non-binding.
Projects
Perhaps Our Next Project Starts Here.
Rohner Engineering is a newly established company built on solid building services expertise and a commitment to personal, precise and reliable project delivery. We look forward to showcasing selected projects here in the future.
Start a Project TogetherDiscuss your project.
Tell us about your plans — free of charge, non-binding, and with a response to your project enquiry within 72 hours.
- 100 % in-house engineering
- A single personal contact
- Response within 72 hours
- Your documents treated confidentially
Direct contact
Prefer to write a short message?
Quick enquiry
For detailed enquiries with file uploads, use the project enquiry form.