How to separate electricity, gas and water for individual flats in a multi-unit building
Published 24 October 2026
Separating utilities in an apartment building means each flat gets its own supply point and meters for electricity and gas, plus a secondary or independent water meter, while common areas get separate measurement. This requires a technical design, often building alterations under Czech Building Law No. 283/2021, and coordination with utility distributors. A properly prepared separation increases unit saleability; exact costs will only be clear after auditing the specific building.
Summary
- Separate electricity and gas measurement requires its own supply point for each flat; water can be handled with secondary meters and cost-sharing.
- The scope of alterations and required permissions under Czech Building Law No. 283/2021 depends on how much the utility runs and building structure are affected.
- Common areas of the building (lighting, lift, boiler room) need their own measurement so one owner doesn't bear all costs.
- Flats with separate meters are easier to market and value; typical value increase from selling the whole building separately versus unit-by-unit is +20–40%, depending on the property's feasibility.
- An audit and plan will map the utility infrastructure and provide decision basis within 6 weeks.
Why separating utilities is essential for unit-by-unit sales
A flat buyer expects to have their own utility contract, their own consumption record and not to pay for neighbours' use. In many older apartment buildings, however, electricity, gas and water are run through a single main meter to the building owner, with tenants paying monthly allowances as part of rent or a shared bill. Once the building is divided into separate units, this model no longer works.
Under the Czech Civil Code No. 89/2012 (sections 1158 onwards), unit ownership arises from the owner's declaration and registration with the Czech Land Registry (katastr nemovitostí). Each unit is defined as a flat or non-residential space, including its connection to common areas. The technical layout of utilities should reflect this boundary, otherwise disputes arise over who maintains what and who pays for it.
Electricity: a separate supply point for each flat
The cleanest solution is a separate supply point with its own electricity meter and supply contract for each flat. Technically this usually means:
- assessing the condition of risers, circuit-breakers and distribution boards in the building,
- adding or relocating meter panels, ideally in a shared-access location,
- ensuring independent wiring and protection (fuses/breakers) for each flat,
- arranging separate supply for common areas (hallways, lift, pumps),
- having the electrical installation inspected and certified.
Requirements for new connections and supply point changes are set by the distribution network operator (distributor) under energy regulations and its own terms. The owner should submit a request well in advance, as the distributor assesses available capacity and may impose conditions.
Gas: the most demanding and heavily regulated element
With gas, it depends on how each flat is heated and how water is heated. Three typical scenarios apply:
- Central boiler room: heat and hot water are shared among flats using heat meters and water meters. Individual gas meters aren't necessary, but the boiler room must have its own management and metering.
- Floor-mounted heating or individual gas boilers in flats: each flat needs its own gas meter and corresponding pipework, often including new risers and flue arrangements.
- Conversion from central to individual supply: this is a significant technical change requiring a design plan and a qualified contractor.
Gas installations are subject to annual inspections and safety checks. Without a valid inspection certificate, the distributor typically won't activate a new gas supply point. An alternative to major refurbishment is to keep the shared heat source with sub-metering, if the building's condition and buyer expectations allow it.
Water and heating: secondary meters and cost allocation
For water, the most common solution is a sub-meter in each flat (separate cold and hot water) with cost-sharing among owners based on actual use. A separate supply point for each flat is only possible if the incoming mains and distribution allow it, and in apartment buildings this is often much more complex.
Practical steps:
- identify the riser route and whether each flat can be separately metered at one point,
- install certified water meters and (if applicable) heat meters,
- set cost-sharing rules in the house rules or bylaws in line with Czech law on flat ownership,
- address common usage (cleaning, gardens, shared spaces).
It's important that the rules are clear before the first flat is sold. Buyers then know what to expect, and you avoid later complaints.
Building law and legal steps
Alterations to utility runs and installations are changes to a completed building. Czech Building Law No. 283/2021 distinguishes by the nature and scope of work—some works need permission, some need only notification (ohlášení), and some can proceed without either. A simple meter replacement usually needs no permission, whereas new risers, openings through load-bearing walls, heating system changes or flue alterations may require a design and approval from the building authority. The specific regime must be assessed for your actual building, not against a template.
The legal process typically includes:
- confirming ownership and any charges on the property with the Czech Land Registry (katastr nemovitostí),
- checking whether alterations breach tenant rights and how changes affect leases,
- including the technical layout in the owner's declaration and its attachments under Czech Civil Code No. 89/2012,
- registration with the Land Registry; under the Czech Land Registry Act No. 256/2013, the registry must wait at least 20 days after notifying the owner, and registration typically takes about 22 days.
Ownership of a unit only transfers to the buyer upon registration, so it's best to finalise the technical layout before buyers sign purchase contracts.
Impact on flat value and marketability
Separated utilities are a clear signal to a buyer that they're buying a standalone, administratively clean unit. This makes bank lending easier, rental use simpler and future resale more straightforward. Shared utilities and vague cost allocation usually lead to price negotiation or rejection of the purchase.
Alteration costs must be weighed against the benefit. The typical value uplift from selling a building whole versus unit-by-unit is +20–40%, but this is only a guideline; the exact figure depends on your building's feasibility. You can check an initial estimate using the building potential calculator.
Time is also a factor. Distributor approvals, inspections and any building consent process all extend the timeline, so utility separation should be planned as a distinct phase, not as a last-minute task before selling.
What an audit reveals and next steps
Our paid Audit and Plan service assesses the technical condition of electrical, gas and water runs, current metering and cost-sharing practice, possible separation options and their outline complexity. Delivery is within 6 weeks and provides the basis for deciding whether and how far to proceed.
A conversion project passes through three gates (legal, permit, sales gate), with each phase confirmed before moving forward. Utility separation mainly sits at the permit gate, but affects legal preparation and sales strategy too. The full process is described on the How it works page; further answers are in Frequently asked questions.