Repair Budget Allocator by %
Split a foundation or basement repair budget across the parts of the job — foundation, waterproofing, drainage, labor and a catch-all — using percentages you control.
Calculator
On a $20,000.00 budget, waterproofing gets $5,000.00 and foundation $7,000.00 at your split. These percentages are labeled typical planning splits — move them to fit your project.
A below-grade repair is rarely one line item. A single job can mix a bit of foundation work, waterproofing, drainage correction and the labor to tie it all together. Before you have firm quotes, it helps to allocate a rough total across those buckets so you know which part of the project deserves the most attention — and so no category quietly gets forgotten.
This allocator multiplies your total by the percentage you assign to each category. The starting splits are labeled typical planning bands, not a rule: every home and every problem is different, so move the shares until they match what your contractors and engineer actually recommend.
Why bother before you have numbers? Because the split tells you where to spend your attention. If drainage is a fifth of the budget but the root cause of a wet basement, it deserves more scrutiny than its dollar share suggests. And if labor swallows a third of the total, that is a signal to ask contractors exactly what that labor covers. A rough allocation turns a single scary number into a plan you can question one piece at a time.
Formula
Each category simply takes its share of the total:
category $ = total × category %
The five shares should add up to 100% (1.00 as a fraction). If they don’t, the tool flags it so you can rebalance — nothing is capped or clipped, the math just follows the fractions you enter.
Worked example
Say you set aside $20,000 and want to weight the job toward waterproofing at a 40% share:
- Waterproofing:
$20,000 × 0.40 = $8,000 - Foundation:
$20,000 × 0.35 = $7,000 - Drainage:
$20,000 × 0.10 = $2,000 - Labor:
$20,000 × 0.10 = $2,000 - Other:
$20,000 × 0.05 = $1,000
The shares total 100%, so the five categories add back to the full $20,000. Change any share and the others don’t move on their own — adjust them yourself until they sum to 100%.
How to use the splits
Use the allocator early, while numbers are still soft. Once you collect itemized written quotes, replace the planning shares with the real line items — a good quote already breaks the job into foundation, waterproofing, drainage and labor, which is exactly the structure here.
Typical splits vary a lot by job. A wet-basement fix skews toward waterproofing and drainage; a settling foundation skews toward piering and engineering. Treat the defaults as a labeled starting point, confirm the real scope with a licensed structural or geotechnical engineer, and remember this is a planning estimate, not a bid. When you have a subtotal you trust, run it through the contingency planner to add a buffer.
One habit worth keeping: let the allocation and the quotes talk to each other. If a contractor’s bid puts 50% of the job into waterproofing when your plan expected 25%, that gap is a question, not a mistake — maybe the water problem is bigger than you thought, or maybe the scope drifted. Revisiting the split each time a new quote lands keeps the whole budget honest, and it stops a single expensive line item from hiding inside a round total.
Reference table
Typical planning splits (labeled defaults — adjust to your job):
| Category | Typical share |
|---|---|
| Foundation repair / piering | 35% |
| Waterproofing | 25% |
| Drainage & sump | 15% |
| Labor | 15% |
| Other / contingency | 10% |