Calculate a subsidy of up to CZK 400,000 or an interest-free loan of up to CZK 2,000,000 for renovating your house or flat. Instant result, free, as a PDF.
Build up your renovation measure by measure and see estimated costs, energy savings and the jump in energy class toward a renovation passport.
Find out whether a garden shed, pergola, pool or fence needs the building authority — complete with a technical sketch.
Find out whether your project needs no permit, a simplified procedure, or a standard one under the new Building Act (283/2021 Coll.).
Estimate a plot's buildable area from its size, zoning-plan coefficients and setbacks — with a live sketch.
An interactive guide that checks, based on your project parameters, whether you must appoint a site health & safety coordinator.
Calculate the dew point from temperature and humidity and assess the risk of condensation on the structure for the winter design state.
Minimum permitted distances of underground utilities for parallels and crossings per ČSN 73 6005. Pick two networks to see the clearance.
Calculate concrete volume, the number of reinforcement mesh sheets and overlaps for slabs, strips and floors, with indicative costs.
Calculate the extra cost of concreting below 5 °C — heating, admixtures, protection and extended curing.
Model the development of hydration heat in concrete and the cracking risk from the temperature gradient in mass structures.
Estimate when concrete reaches the strength needed for striking based on temperature, concrete class and structure type.
Estimate screed drying time before flooring and build a heating protocol for heated floors.
Design and check a permanent-formwork retaining wall — stability against overturning and sliding, with a live cross-section sketch.
Interactive design of a gabion retaining wall — dimensions, fill, structural check and budget in both basic and pro modes.
Build an indicative roof-cladding budget — covering, membranes, insulation and accessories by roof area and pitch.
Compare sprayed PUR foam and mineral wool by thermal resistance, thickness and cost for your structure.
Assess a green roof build-up, loading, rainfall retention and the suitability of the vegetation layers for your building.
Find out how much shower and basin water you can recycle, what tank you need and how much you save per year.
Size a rainwater retention tank from roof area, rainfall and the required discharge rate.
Design room acoustic treatment and see how absorptive surfaces shorten reverberation time to a target value.
Compose your timber-frame build-up and watch how the structure, thermal performance and indicative costs change.
An interactive guide that sorts your construction project into the right building category and shows the obligations that follow.
Evaluate local floor flatness deviations from wedge measurements under a 2m straightedge — the tool subtracts the spacer height and compares the worst deviation against your contractual tolerance.
Enter a measured deviation of verticality, flatness, straightness or position, add your limit, and instantly see whether it is within tolerance and by how much. Export the report as PDF.
From the excavation dimensions, calculate the bulked soil volume, its weight in tonnes, the number of tipper trips and the landfill disposal cost.
Calculate the scaffolding area from facade dimensions and the rental price, or compare whether buying the scaffolding pays off. For frame and tube scaffolding.
Tile, adhesive and grout consumption, a cut optimizer, laying procedure and a quality checklist — everything for tilers and pavers in one place.
Computes the ideal loop spacing of underfloor heating so the required output is delivered at the lowest possible water temperature. Watches surface temperature per ČSN EN 1264, loop length and pressure loss.
Enter the dimensions, drag the drain across the floor plan, and instantly know the screed height in the corners, the slope in mm per metre and the screed volume.
Estimate an indicative price for technical site supervision. The client tab estimates a fee from market practice; the supervisor tab generates a custom quote as a PDF.
Work out how long until room CO₂ exceeds the 1200 ppm hygiene limit per Decree 146/2024, how much fresh air you need and how often to ventilate.
From the plot perimeter, compute the number of posts and braces, the metres of mesh or number of panels, gravel boards and bagged concrete. It even checks sightlines at the driveway.
Calculate how many lumens and luminaires a room needs using the flux method, and which colour temperature, CRI and flicker to choose for healthy light day and night.
How many bags of concrete per m³, how much a cubic metre weighs, adhesive by trowel notch and rebar weight. A precise converter for construction units and material usage.
Calculate the design airflow for heat recovery in a family house using two methods per Decree 146/2024: per-person dose and extraction from wet rooms.
Work out at what temperature and humidity mould starts to grow in a room corner. An indicative condensation risk based on physics and Decree 146/2024.
Calculate the correct drain slope from physics, not a standard table. Find the self-cleaning minimum and the healthy slope range for your DN, material and pipe length.
Calculate how much paint and primer to buy. Enter the dimensions, substrate absorbency and coverage from the label, and get the number of packs plus a reserve.
Calculate a household's daily and yearly water demand and the indicative size of the water connection and meter. Anchored in Decree 428/2001 and flow physics.
Calculate a family house's climate resilience and get an A–G label. Three weighted pillars: heat and overheating, water and drought, energy self-sufficiency.
Per Decree 146/2024 a habitable room must have a clear height of at least 2.5 m (2.2 m in an attic) and an area of at least 8 m². Check it online.
Calculate whether a floating floor can carry an aquarium, bookcase or safe. Pressure on the insulation under the screed, long-term EPS load capacity and a recommended spreader board.
When a railing is required, how high it must be and what gaps the infill may have. An interactive section anchored to Decree 146/2024 and ČSN 74 3305.