As-built documentation of the Homepark Zličín retail park, Prague

Homepark Zličín is not a single hall. We produced the as-built documentation as two packages, one for building A and one for the connected buildings B and C, and the ground floor plan of B and C alone is laid out across 51 A4 sheets. For Bon Tech Advisory s.r.o. we surveyed the site on 14 May 2026 with a mobile and a static laser scanner. Alongside the drawings and the BIM model we delivered a survey report on column verticality and roof truss deflection.

The retail park on Skandinávská street in Prague 13 is treated in the documentation as two parts, building A and the connected buildings B and C. A sizeable archive of original drawings has survived, including the work of the original architect of building A and an earlier office fit-out inside building B. An archive tells you how a site was designed, not what it looks like now, and Bon Tech Advisory s.r.o. needed the current condition on record. The brief went beyond a standard as-built survey. It also covered the geometry of selected load-bearing elements and the thickness of the roof deck, which is intended as input for a structural assessment of the roof under the added load of photovoltaic panels.

The site was surveyed on 14 May 2026 using two techniques at once. Sales floors and back of house areas were walked with a mobile SLAM scanner, which captures the layout quickly and as a whole. Where millimetres mattered, a FARO Focus Premium static laser scanner was set up on a tripod. The individual scans were registered in FARO SCENE using a combination of targets and cloud to cloud matching into a single coloured point cloud, and vertical and longitudinal sections were then cut through the elements of interest. The thickness of the trapezoidal roof sheeting was measured with an ultrasonic gauge by an external specialist working to our order.

The client received two drawing packages at 1:100, floor plans of both storeys above ground and a section, separately for building A and for buildings B and C, in PDF and in DWG. The Revit model of the existing condition and two IFC exports came with them. The survey report is a deliverable in its own right. Column verticality was assessed against ČSN EN 13670, where a clear column height of 7.150 m gives a limit of 15 mm. Most of the measured columns came in under 5 mm. One column in one of the retail units was measured at 25 mm, which is 10 mm over the limit. Roof truss deflections over a theoretical span of 12 m ranged from 18 to 38 mm against a 48 mm limit under ČSN EN 1992-1-1, so all of them passed. The ultrasonic measurement returned sheet thicknesses between 0.77 and 1.05 mm, with a recommendation to work with a single value of 0.75 mm for an assessment of the whole site.

Project challenges

A retail park cannot be surveyed as one building. Each unit is a separate tenancy with its own back of house space and its own access, yet the floor plans still have to line up into one coherent whole. The second issue is choosing the right instrument. A mobile scanner covers large floor areas fast, but it is not accurate enough to judge a column against a 15 mm tolerance, which is why a tripod mounted static scanner is added. The third point is the limit of what an as-built survey can say. No probes or other invasive checks were made, so concealed structures and build-ups are not recorded in full. Measured geometry on its own also says nothing about load capacity. When a single column exceeds the tolerance by 10 mm, the right next step is a separate structural assessment rather than guesswork over a drawing.

Project outputs

• Floor plans of both storeys above ground and a section of building A at 1:100, in PDF and DWG
• Floor plans of both storeys above ground and a section of buildings B and C at 1:100, in PDF and DWG
• Revit BIM model of the existing condition
• Two IFC exports of the model
• Registered coloured point cloud from mobile and static scanning
• Survey report on the verticality of the reinforced concrete columns and the deflection of the roof trusses
• Three drawing annexes to the report, with schemes of the measured areas and sections through the point cloud
• Report on the thickness of the trapezoidal roof sheeting, procured from an external specialist
• Earlier partial deliverable covering the roof plane, in DWG
• Photographic record from site