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Installing AC in a Prague Apartment Building

Most residential buildings in Prague, especially the prefab blocks (paneláky) and pre-war apartment houses you will find all over the city, are owned collectively by an SVJ - the Czech abbreviation for a homeowners association made up of everyone who owns a flat in the building. If you want to mount an outdoor AC unit on the shared facade, that facade is not just yours to use. Getting it right with the SVJ from the start makes the whole project go a lot more smoothly.

Why you need approval at all

An outdoor unit fixed to the building's facade is an intervention in a shared part of the property, which is why the vast majority of Prague apartment buildings require sign-off from the SVJ or building manager before installation. Sorting this out in advance saves time and friction later - you avoid a situation where the unit is already mounted and a neighbor or the SVJ board objects to where it sits. Based on dozens of installations in Prague buildings, it pays to raise this early and specifically, ideally before you even book a survey of the space.

Who actually gives the approval

In buildings split into individually owned flats, approval is usually granted by the SVJ board or a hired building manager, sometimes after a vote among owners. In a building owned outright by a single landlord rather than divided into owned units, it is usually enough to get sign-off directly from the landlord. Timing varies a lot from building to building - some boards can confirm within days, others only meet a handful of times a year - so it is worth submitting your request well ahead of the date you actually want installed. If you are not sure who to approach in your building, we can point you in the right direction based on your situation once you get in touch.

What to include in the request

A request to the SVJ typically needs the exact placement of the outdoor unit (which facade, at what height), its approximate dimensions, a note on expected noise, and a rough installation date. Attaching a photo or a simple sketch with the placement marked helps a lot - it lets the board and neighbors picture how the installation will actually look from outside. The more concrete and clear the request, the faster approval tends to come through. We are happy to help put together the supporting material once we have surveyed the space.

Where to place the outdoor unit

The best spot is one that does not point directly at a neighbor's windows, a shared terrace, or a courtyard where people spend time. It is worth keeping a reasonable distance from windows on the floors above and below, and choosing an orientation so that airflow - and any noise - is directed away from occupied space. In prefab blocks and older buildings we generally manage to place the unit without any visible change to the facade, which also tends to make approval easier to get.

Noise - the basics

Outdoor unit noise depends mainly on placement, distance from windows, and whether the unit sits on anti-vibration mounts that stop vibration transferring into the building structure. Good units also have a quiet night mode that runs the fan at a lower speed, which is worth using for any installation near a neighbor's bedroom window. When comparing units, ask for the manufacturer's declared noise level in decibels, particularly for night-time operation.

Condensate drainage

While cooling, a unit continuously produces condensate that needs to be routed away so it does not drip onto a pavement, the balcony below, or the facade itself. It is usually carried by a small hose into a vertical waste pipe, a rainwater drain, or a gutter. We plan the condensate route at the same time as the placement of both units, so the line stays short and out of sight and does not cause problems for anyone below or at ground level.

How TopKomfort helps with the SVJ process

We have completed installations in hundreds of Prague apartment buildings and know how to communicate with SVJ boards and neighbors so the installation goes ahead without unnecessary friction. We help prepare the supporting material for the request, propose a placement that respects both the facade and the neighbors, and our certified technicians handle noise and condensate properly on the day. For what the installation itself involves once approval is in hand, see our step-by-step guide to how AC installation works .