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May 12, 2026
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Project Hub
Floor Prep Estimating
Floor preparation often involves several materials that do different jobs: membranes for moisture control, underlay for comfort or noise, and compounds or screeds for levelling. Use this project hub to start with the prep layer that actually matches the job.
Floor prep4 calculatorsGuides and quote prep included
How to use it
Planning before buying
Use this project hub for a planning check, then confirm the final order or quote against live product data and site conditions.
Why trust it
See how the site is maintained
Read the calculator methodology and editorial policy for the standards behind these pages.
Choose the floor prep layer before you calculate
Floor preparation often involves several materials that do different jobs: membranes for moisture control, underlay for comfort or noise, and compounds or screeds for levelling. Use this project hub to start with the prep layer that actually matches the job.
Screed Calculator
Estimate screed volume and rough cost for floor levelling jobs.
Self-Levelling Compound Calculator
Estimate self-levelling compound bags and rough cost from floor area and product coverage.
Underlay Calculator
Estimate underlay packs or rolls and rough cost for flooring installs.
DPM Calculator
Estimate damp-proof membrane rolls and rough cost for floor areas.
What changes floor prep quantities most
Substrate condition, finished depth, overlap rules, and the difference between nominal product coverage and real site yield are the usual drivers.
Where people under-order
Levelling products and membranes are often estimated from room size alone without allowing for overlap, irregular areas, or extra depth in low spots.
Before you order
Check the intended layer thickness, substrate condition, overlap requirements, and whether primer, tape, edge strip, or moisture control products need to be bought as well.
Common floor prep questions
Use these pages when you want a fast estimate for the layer you need before comparing product options or installation methods.
Screed Calculator by Volume
Work out how much Screed you need from length, width, depth, and a realistic waste allowance.
Screed Quantity Guide
Use the job dimensions to build a sensible order quantity for Screed.
Self-Levelling Compound Calculator by Area
Work out how much Self-Levelling Compound you need from the measured area and a realistic waste allowance.
Self-Levelling Compound Buying Guide
Work out a sensible buying quantity for Self-Levelling Compound before you order.
Underlay Calculator by Area
Work out how much Underlay you need from the measured area and a realistic waste allowance.
Underlay Buying Guide
Work out a sensible buying quantity for Underlay before you order.
DPM Calculator by Area
Work out how much DPM you need from the measured area and a realistic waste allowance.
DPM Buying Guide
Work out a sensible buying quantity for DPM before you order.
Use this project hub to brief suppliers or installers
Work through the core calculator first, then use the linked guides and quote checklist to request cleaner, more comparable prices.
- Confirm what the quote should include: materials only, labour only, or both.
- State access, finish level, timing, and any unknowns clearly.
- Ask each supplier or installer to price the same scope and exclusions.
You can also open the wider Floor Prep Estimating project hub if the quote depends on more than one material.