Mobile Home Pier Calculator: How Many Support Piers You Need
Piers hold a mobile home up and keep it level. Here is what drives the count and why the answer is always a range.
What piers actually do
A manufactured home sits on steel I-beams that run its full length. Piers transfer the weight from those beams down to the ground, keep the home level, and prevent sagging or racking as the soil shifts.
Length and type drive the count
A single-wide has 2 main beams, a double-wide has 4 beams plus support along the marriage line where the halves meet, and a triple-wide has 6 beams with two seams. Longer homes need more piers along each beam because pier spacing along the beam is usually capped at 8 to 10 feet.
Single vs double vs triple wide
A 60 foot single-wide might need 12 to 16 piers, a 60 foot double-wide often needs 24 to 32, and a triple-wide can require 36 or more. The extra beams and the marriage line supports are what drive the jump.
Why it is a range
Soft or expansive soil requires closer pier spacing and larger pads. Local code and wind zone can push the count higher. The home's manufacturer specifications always overrule a general estimate.
Frequently asked questions
How often should a mobile home be re-leveled?
Most manufacturers recommend a re-level within the first year of set-up and then every 3 to 5 years, or any time you notice sticking doors, cracked drywall, or a soft spot in the floor.
Why does a double-wide need more piers than a single-wide?
A double-wide has four main steel I-beams instead of two, plus support along the marriage line where the two halves join. More beams and a wider footprint mean more support points.
Is the pier count from a calculator exact?
No. Any calculator gives a planning range. The final count depends on soil bearing capacity, local code, the home's manufacturer specs, and the setter's judgment on the site.
Try the calculator
Get a planning range in seconds with our Mobile Home Pier Calculator.