What gets inspected in a home and how often — Czech Republic

Version: 2026-06 Locale: en Owner: vp Updated: 2026-06-01

This overview summarizes what servicing, inspections, and revisions Czech law requires for a typical private detached home, and what we additionally recommend beyond the law for a safer insurance position. Homsy derives what it adds to your maintenance plan and which reminders it sends from this document. It describes Czech regulations — Homsy's maintenance rules are scoped to the Czech Republic only, regardless of which language you're reading the app in.

Homsy makes no legal guarantees. Specific obligations can vary by the type and use of the property. If in doubt, consult a professional or the relevant authority (Fire Rescue Service, municipal building authority, energy distributor, insurer).

Assumptions

This document describes a framework that applies to:

• a private detached home in the Czech Republic, used predominantly for residential purposes, not for business, accommodation services, or a housing association (SVJ);
• domestic appliances up to 50 kW (chimneys and flue-gas paths);
• solid-fuel boilers in the 10–300 kW range, which falls under the Air Protection Act.

Initial (commissioning) inspections for electrical wiring, gas, and solar (PV) apply almost universally — distributors require them on new connections or when the wiring is modified. For periodic inspections, the legal situation for a purely private detached home is less clear-cut than for chimneys or solid-fuel boilers. For these cases, we distinguish:

• what's required by law (mandatory, subject to fines),
• what's a safe minimum for insurance purposes (recommended, well-defensible in a claims process),
• what saves time and money (optional, manufacturer's guidance only).

This maps to the three strictness modes you can choose in Homsy: conservative, balanced, minimal.

Overview of obligations and recommendations

Detail by system

Chimney and flue-gas path

Legal basis: Act No. 133/1985 Coll., on Fire Protection; Decree No. 34/2016 Coll.

For typical domestic appliances up to 50 kW, frequency depends on fuel type and operating mode:

Revision of the flue-gas path isn't performed on a fixed yearly schedule. It's required in particular:

• before a new flue-gas path is commissioned,
• after structural changes to the chimney,
• when the fuel type changes,
• before connecting an appliance to a previously unused flue-gas path,
• when an appliance is replaced or newly installed,
• after a chimney fire,
• when cracks appear or are suspected.

Who may do it: the inspection is performed by a chimney sweep, who issues a report on cleaning and inspection of the flue-gas path. Only a holder of the professional qualification chimney sweep – flue-gas path revision technician may perform the revision. Only cleaning of appliances up to 50 kW may be done by the owner.

Penalties: neglect can carry a fine of up to CZK 10,000 for an individual, and up to CZK 25,000 if it results in a fire.

Solid-fuel boiler (10–300 kW)

Legal basis: Act No. 201/2012 Coll., on Air Protection; ČSN EN 303-5.

The operator of a solid-fuel combustion source with a rated thermal input of 10–300 kW inclusive, serving as the heat source for a hot-water central heating system, must arrange a technical-condition and operation check at least once every 3 years.

Since September 2024, old boilers of emission classes 1 and 2 may no longer be operated in households.

Who may do it: the check is performed by a professionally qualified person as defined by law, typically a technician trained by the manufacturer or a person authorized by the manufacturer. The Ministry of the Environment maintains a public list of these people.

What to keep: the proof of check — the owner must retain it and present it on request to the municipal authority with extended powers.

Penalties: a non-business individual risks a fine of up to CZK 20,000.

Recommendation beyond the law: an annual pre-season service (cleaning the heat exchanger, checking door seals, safety components, pumps, controls).

Gas boiler and gas equipment

Legal basis: Act No. 250/2021 Coll.; Government Regulation No. 191/2022 Coll.

This is the most common misunderstanding: Government Regulation 191/2022 generally requires an annual check and a three-year operational revision for reserved gas equipment, but § 19(2) explicitly states that this obligation does not apply to reserved gas equipment used by owners of detached homes.

In other words: the general annual check and three-year operational revision under Regulation 191/2022 are not an explicit statutory obligation for a typical detached home.

What is required in practice:

• On a new connection or construction of a new gas offtake installation, the distributor (e.g. GasNet) requires a revision report of the completed gas offtake installation before the meter is installed.
• A new revision is required after work on the gas piping, a boiler replacement, a change in installation conditions, or an unusual event.

Recommendation beyond the law: an annual gas boiler service. Required by manufacturers, service terms, and in practice by insurers as well.

Liquid-fuel boiler

For the boiler itself, we haven't found a periodic home interval spelled out as clearly in public Czech regulations as for solid-fuel boilers. Obligations regarding the flue-gas path still apply under Decree No. 34/2016 Coll.

Recommendation: an annual pre-season service, with service records kept properly.

Home electrical wiring

Legal basis: Act No. 250/2021 Coll. (§ 20); Government Regulation No. 190/2022 Coll.; ČSN 33 2000-6 ed. 2; ČSN 33 1500.

Act 250/2021, § 20 frames the obligations of operators of reserved technical equipment (VTZ) as explicitly applying to legal entities and business individuals. Annex 4 of Regulation 190/2022 doesn't contain a separate category for an ordinary detached home.

What's practically required:

• An initial revision on new installation or major renovation — required by distributors (ČEZ Distribuce, EG.D, PREdistribuce) when connecting a new offtake point, replacing the electricity meter, or changing the main circuit breaker rating.

Recommendation beyond the law: the MPO-EKIS advisory service states a five-year interval for periodic revision in a normal detached-home environment. This isn't an explicit statutory deadline, but it represents a strong technical and insurance standard. Sooner after:

• water ingress into the distribution board or wiring,
• fire,
• a direct lightning strike,
• a major electrical renovation,
• a recurring fault.

Who may do it: a revision technician for reserved electrical equipment (Act No. 250/2021 Coll., Regulation 194/2022 Coll.).

Solar PV

Legal basis: ČSN 33 2000-7-712; ČSN EN 62446-1 and ČSN EN 62446-2.

What's practically required:

• An initial PV revision report at commissioning and connection to the distribution grid. Distributors require it as part of the mandatory connection documentation.

Recommendation beyond the law (the Fire Rescue Service of the Czech Republic explicitly recommends regular maintenance and preventive checks, but without a specific interval):

• Annual service and monitoring check — visual/diagnostic inspection, output check, panel cleaning.
• Full electrical revision at latest after 5 years, or after 3 years for roof-mounted PV with battery storage or higher risk.

What to keep: the initial PV revision report, single-line diagram, protection-device protocols, service records, monitoring export, photos of component nameplates.

Solar thermal system

We haven't found a separate statutory periodic service interval for detached homes in public Czech sources. Materials from the State Environmental Fund / Ministry of the Environment describe solar thermal systems as a technology requiring minimal maintenance.

Recommendation beyond the law: an annual service check — pressure, expansion vessel, pump, controller, tightness, antifreeze fluid condition, anti-stagnation protection. Fluid replacement interval per the manufacturer's manual.

Lead time for contacting a supplier

Scheduling maintenance for a specific date in practice means contacting the supplier well in advance — trades in the Czech Republic are seasonally overloaded, and boiler technicians, chimney sweeps, or roofers are often booked out weeks ahead. That's why Homsy works with a lead time (lead_time_days) for every task: the dashboard shows a task lead time days before the actual due date, not just on the day the service is due.

Recommended lead times (defaults, overridable per task or per plan):

These values are recommendations, not a statutory norm. They're based on typical booking lead times for Czech trades and seasonal demand (heating technicians in autumn, chimney sweeps in summer, roofers in spring). If your supplier usually takes you "next week," feel free to shorten the lead time.

A machine-readable copy of this table lives in code as LEAD_TIME_DEFAULTS_DAYS (lib/sheets/schema.ts). When a value in the table above changes, update the constant too (and vice versa).

The rules themselves (when a boiler service is triggered, when a lightning-rod revision is due, etc.) live in machine-readable form in lib/knowledge/rules.cz.md — which stays Czech-only regardless of UI language, since the underlying regulations are Czech. This document remains the human-readable source of truth: when you change a rule here, keep it in sync with rules.cz.md.

Insurers and claims

Insurers usually don't automatically deny a claim just because a document is missing, but they examine closely whether neglected maintenance or a missed revision was causally linked to the damage.

• Allianz, under its current terms, requires the policyholder to keep the property in good technical condition, carry out the prescribed revisions, and fix known faults without delay. For fires, it commonly requires proof of a chimney revision or flue-gas path inspection records.
• ČPP (Česká podnikatelská pojišťovna), in its household terms, states an obligation to observe revision deadlines, etc. If a violation had a material effect on the cause or extent of the damage, the insurer is entitled to proportionally reduce the payout.

Practical rule for an "insurance-safe" regime:

• Chimneys — never skip the legally required inspection.
• Gas, oil, solar thermal, and PV systems — an annual service protocol.
• Detached-home electrical wiring — initial revision + documented periodic revision every 5 years.
• After a major change, fault, fire, lightning strike, or water ingress — an unscheduled revision/check.

Timeline

Sources and regulations

Acts and regulations

• Act No. 133/1985 Coll., on Fire Protection.
• Decree No. 34/2016 Coll., on cleaning, inspection, and revision of the flue-gas path.
• Act No. 201/2012 Coll., on Air Protection (§ 17 — obligations of the operator of a combustion stationary source).
• Act No. 250/2021 Coll., on the safety of work in connection with the operation of reserved technical equipment.
• Government Regulation No. 190/2022 Coll., on reserved technical electrical equipment.
• Government Regulation No. 191/2022 Coll., on reserved technical gas equipment.
• Government Regulation No. 194/2022 Coll., on professional competence for work on reserved technical equipment.

Technical standards (ČSN / ČSN EN)

• ČSN 73 4201 — Chimneys and flue ducts — design, construction, and connection of fuel-burning appliances.
• ČSN EN 303-5 — Central heating boilers for solid fuels.
• ČSN 33 1500 — Revision of electrical installations.
• ČSN 33 2000-6 ed. 2 — Low-voltage electrical installations — Part 6: Verification.
• ČSN 33 2000-7-712 — Low-voltage electrical installations — Solar photovoltaic (PV) power supply systems.
• ČSN EN 62446-1, 62446-2 — Photovoltaic (PV) systems — documentation, commissioning tests, testing, and maintenance.
• ČSN EN 62305 — Protection against lightning.

Practical information sources

• Fire Rescue Service of the Czech Republic (HZS ČR) — flue-gas path obligations, solar PV, and fire safety.
• Ministry of the Environment (MŽP) — list of professionally qualified persons for solid-fuel boiler checks, materials on the Air Protection Act.
• MPO-EKIS — energy advisory service, recommended revision intervals for detached homes.
• Electricity distributors — ČEZ Distribuce, EG.D, PREdistribuce: requirements for initial revisions on connecting an offtake point or generation source.
• GasNet — requirements for gas offtake equipment revisions.

How Homsy uses this document

Homsy derives the rules in your maintenance plan from this overview. Each rule has:

• Strictness — legal (required by law), recommended (insurance-safe), optional (manufacturer's guidance only).
• Authority — a reference to the specific regulation or standard (e.g. Decree No. 34/2016 Coll.).
• Czech title — what you'll see in the plan (e.g. Annual chimney inspection); Homsy's maintenance plan content itself stays in Czech, since the underlying rules and regulations are Czech-specific, regardless of the UI language you've selected.
• Why — a short explanation of why it's in the plan.

The internal rule format is described in the data-model project specification. Updates to this document should accompany updates to the rules file; both are versioned together with the application build.

This document is a reference. Specific obligations may change; always verify the current wording of the regulation before making an important decision.