Why is a full-scale walkthrough so important for slab-on-grade construction?

Slab-on-grade is the most permanence-heavy foundation type. All plumbing rough-in (drains, supply lines, vents) is poured into the concrete and cannot be moved without breaking the slab. Structural orientation, garage door positioning, and exterior drain locations all become final the moment concrete cures. A walkthrough catches design issues before any of these become permanent.

How much does plumbing rough-in cost on a slab home?

For new construction, plumbing rough-in costs $300-$600 per fixture, with bathroom rough-ins averaging $6,500 (range $3,000-$20,000) per Angi 2026 and Paragon Estimating 2025. A 17-fixture home rough-in on slab-on-grade runs $11,000-$13,000 per master plumber estimates. Total plumbing for a new home runs $4-$8 per sq ft, so a 2,000 sq ft home is $8,000-$16,000 in plumbing alone. Moving a single fixture more than 3 feet adds $500-$1,000 — but only if you catch it BEFORE the slab pour.

How long does the pre-slab walkthrough take?

Roll-out takes about 20 minutes. The walkthrough itself typically runs 1-2 hours depending on home size and number of stakeholders. We recommend doing the walkthrough before any excavation or trenching for plumbing — once dirt work starts, changes get expensive fast.

Can I walk a barndominium or pole barn floor plan before the slab pour?

Yes — barndominium and post-frame slab construction is one of our most common use cases. Walk the layout on the actual building pad to verify shop-to-living separation, post locations, garage door clearances, and slab plumbing rough-in before pouring. Especially valuable for barndominiums where post placement determines wall locations.

What file format do you accept?

PDF only. If your floor plan is in CAD (DWG, DXF), Revit (RVT), or SketchUp (SKP), please convert to PDF before sending — most CAD software exports PDF directly through File → Export or File → Save As. Vector PDFs preserve full vector quality at 1:1 scale.

How quickly can I get a print before my slab pour?

We confirm receipt of your PDF plans within hours during business days, with a digital proof at true 1:1 scale in roughly 48 hours. From proof approval, prints typically arrive in 7-10 business days via FedEx Ground (shipping calculated separately based on plan size and destination). For tight schedules, contact us at 937-901-3402 to discuss expedited timelines.

What happens if I find an issue during the walkthrough?

That's the point. Use the print to mark up changes with your designer and contractor. Move walls, adjust plumbing fixture locations, reposition the garage, rotate the house on the lot — whatever needs to happen. Changes at this stage cost paper and time. The same changes after slab pour cost $35,000 to $65,000 in change orders, and any sub-slab plumbing change requires breaking concrete.

How much does a pre-slab walkthrough cost?

$0.45 per square foot with a $100 minimum order — any size works. A 1,500 sq ft slab home prints for $675. A 2,500 sq ft home prints for $1,125. A 3,200 sq ft barndominium prints for $1,440. Any size works, with small orders simply pricing up to the $100 minimum. FedEx Ground shipping calculated separately.

Walk Your Slab Before You Pour It | Pre-Slab Floor Plans

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Big Floor Plans launched in 2020 to ship life-size floor plans directly to construction jobsites.

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