How to Measure a Portable Spa (Step-by-Step Guide)
These instructions are for standard portable spas (above-ground hot tubs). If you have a built-in or in-ground spa, please contact us before ordering.
Not sure what type of spa you have?
Call (949) 496-2883 and we’ll help you measure it correctly.
How to Measure a Portable Spa Cover (Radius or Cut Corners)
Standard Square
Rounded Corners
Cut Corners
If your spa is a built-in plaster spa (Gunite), please call for instructions: (949) 496-2883
- Standard Square: Corners come to a 90° point. Length and width only.
- Rounded Corners: Corners are rounded. See radius measuring instructions.
- Cut Corners: Corners are cut off. Note: sizes may vary.
We recommend drawing your spa (including the fold) and measuring all sides before placing your order.
Step 1: Choose Your Cover Fold Direction
When ordering, you’ll be prompted to choose your spa shape and enter your dimensions. Before that, you may need to select how your cover will fold.
This step may not apply to every spa, but it can be based on personal preference or required if you have a cover lifter.
Step 2: Measure Length and Width
Measure the outer edge of the fiberglass from side to side. Do not measure the water.
If your spa has cut corners or rounded (radius) corners, you’ll measure those in the next step.
Step 3: Measure Corner Type and Size
Cut corners can be measured with a ruler. Rounded (radius) corners are best measured using a carpenter’s square.
If you’re unsure, call us at (949) 496-2883 and we’ll help you get it right.
Rounded (radius) corners are best measured using a carpenter’s square, as shown above.
Measure from where the curve begins to where it meets the straight edge.
If you’re unsure, call us at (949) 496-2883 and we’ll help you get it right.
Depending on your spa shape, you may need to measure all sides, including cut or rounded corners, as well as each section in between (see diagram above).
Step 4: Measure Skirt Length
Measure from the top of the spa to the bottom of the spa lip, as shown above.
This measurement determines how far the cover skirt hangs down around your spa.
Spas installed in-ground or in a deck may not require a skirt.
Step 5 — Safety Tie-Downs
Lockable safety tie-downs help secure your cover and are ASTM compliant for child safety.
Options: none, 2 (one per side), or 4 (two per side).
Four (4) tie-downs are required for ASTM-compliant child safety covers.
Step 6: Vapor Barrier (VPB3000)
All of our covers include the VPB3000 Vapor Proof Barrier, a heavy-duty plastic liner that is vacuum sealed around the foam core.
This barrier helps prevent moisture from entering the foam, extending the life and performance of your spa cover.
A double wrap is recommended for spas equipped with ozone systems or in high-moisture environments.
Step 7: Choose Your Foam Thickness
Foam thickness affects the strength, insulation, and overall lifespan of your spa cover.
Thicker foam provides better durability and energy efficiency, especially for larger spas or colder climates.
If you’re unsure which option is best, call (949) 496-2883 and we’ll help you choose the right cover.
In-Home Measuring Services Orange County & LA County
Located in Orange County or Los Angeles County? We offer in-home measuring services to ensure a perfect fit for your new spa cover.
We’ll measure your spa, confirm all specifications, and answer any questions before you place your order.
Call (949) 496-2883 to schedule an appointment.