Estimating and Programming a Rendered Facade Repaint
You are pricing a repaint of a rendered single-storey shopfront, 45 metres long and 4 metres high, plus a 3-metre return wall. The render has widespread hairline crazing and two areas of hollow, drummy render about 2 square metres each. The existing coating is a semi-gloss acrylic in sound condition except where it is blistering near a downpipe. Access requires a mobile scaffold tower along the frontage, and the shop trades six days a week, so work is limited to Sundays and after 6 pm. Your labour rate is 65 dollars per hour, and you estimate 0.35 hours per square metre for preparation and two coats on sound areas.
1. Calculate the approximate wall area and outline how you would adjust your estimate for the defects and access constraints.
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Front wall area is 45 m x 4 m = 180 square metres. The return wall is 3 m x 4 m = 12 square metres, so total area is about 192 square metres.
The base labour estimate at 0.35 hours per square metre is 192 x 0.35 = 67.2 hours. That figure assumes sound areas only. I would add allowances for the drummy render: two areas of about 2 square metres each need cutting out, re-rendering, and curing before painting, which adds material and drying time. The crazing needs filling or a bridging preparation across the affected zones. The blistering near the downpipe needs investigation, likely a moisture source, and repair before recoating, or it will recur.
Access by mobile tower along 45 metres adds erection, dismantling, and moving time. Sunday and after-hours work adds penalty rates and reduces productive hours. I would price these as separate line items and state assumptions and exclusions in the quote.
2. Explain the sequencing and quality risks you would manage given the restricted working windows.
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With work limited to Sundays and after 6 pm, drying and recoat windows become the main risk. I would schedule preparation and repairs first, allowing cure time for re-rendered patches before priming, then apply coats so recoat intervals fall within available windows. If evening application is followed by cool overnight conditions, I would check the product's minimum application temperature and recoat time before proceeding.
The trading shopfront means the public must be kept clear of the tower and wet coatings, so barricades and signage are needed each session. I would protect the shop's signage and glazing from overspray and drips.
Quality risks include visible lap marks from stopping mid-wall, so I would plan stop points at natural breaks. I would inspect each section before the next coat and record conditions and progress so defects are caught within the window rather than after.