Vanometry

U-Haul truck interior dimensions

The 15, 20 and 26 ft U-Haul trucks have a raised shelf over the cab, which U-Haul calls the Mom’s Attic. The total inside length includes that shelf. The flat floor below it is shorter. The 10 ft truck has no shelf. Used U-Haul trucks are a common starting point for box truck conversions.

Total length runs to the front of the Mom’s Attic. The flat floor length is listed separately for each truck.

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92″86″
15 ft U-Haul in section, looking forward. Bare interior, drawn to scale.

All sizes at a glance

U-Haul truck interior dimensions, bare interior and payload
MODELLENGTHWIDTHHEIGHTBETWEEN WHEEL WELLSPAYLOAD
10 ft U-Haul119″ (302 cm)75″ (191 cm)73″ (185 cm)Flat floor2,850 lb
15 ft U-Haul174″ (442 cm)92″ (234 cm)86″ (218 cm)Flat floor6,385 lb
20 ft U-Haul233″ (592 cm)92″ (234 cm)85″ (216 cm)Flat floor5,700 lb
26 ft U-Haul314″ (798 cm)97″ (246 cm)99″ (251 cm)Flat floor12,859 lb

Bare interior from manufacturer and body-builder specs, before insulation or paneling. Payload figures are ratings where published and estimates where not. Real vehicles vary by an inch or two, so measure yours before you cut materials.

Size by size

10 ft U-Haul

The 10 ft U-Haul is 119 in (302 cm) long, 75 in (191 cm) wide and 73 in (185 cm) tall inside (9 ft 11 in of floor). With about 1 in of insulation and paneling on each surface, the inside is about 118 × 73 × 71 in. Payload is about 2,850 lb.

BARE INTERIOR L × W × H
119 × 75 × 73″ (302 × 191 × 185 cm)
INSULATED AND PANELED, ABOUT
118 × 73 × 71″
FLOOR LENGTH
9 ft 11 in

U-Haul’s 10 ft truck, the smallest one they rent. The box is 9′11″ long inside, and there is no Mom’s Attic.

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15 ft U-Haul

The 15 ft U-Haul is 174 in (442 cm) long inside including the Mom’s Attic, with 143 in (11 ft 11 in) of flat floor. It is 92 in (234 cm) wide and 86 in (218 cm) tall. The attic shelf is 31 in deep and 56 in above the floor. With about 1 in of insulation and paneling on each surface, the inside is about 173 × 90 × 84 in. Payload is about 6,385 lb.

BARE INTERIOR L × W × H
174 × 92 × 86″ (442 × 234 × 218 cm)
INSULATED AND PANELED, ABOUT
173 × 90 × 84″
FLOOR LENGTH
11 ft 11 in flat, 14 ft 6 in with the attic

U-Haul calls this the 15 ft truck. Box-truck folks would call it a 12 or 14 footer. The flat floor is 143″. The raised shelf up front is the Mom’s Attic over the cab.

Open the 15 ft U-Haul in the planner →

20 ft U-Haul

The 20 ft U-Haul is 233 in (592 cm) long inside including the Mom’s Attic, with 203 in (16 ft 11 in) of flat floor. It is 92 in (234 cm) wide and 85 in (216 cm) tall. The attic shelf is 30 in deep and 54 in above the floor. With about 1 in of insulation and paneling on each surface, the inside is about 232 × 90 × 83 in. Payload is about 5,700 lb.

BARE INTERIOR L × W × H
233 × 92 × 85″ (592 × 234 × 216 cm)
INSULATED AND PANELED, ABOUT
232 × 90 × 83″
FLOOR LENGTH
16 ft 11 in flat, 19 ft 5 in with the attic

U-Haul’s 20 ft truck. The flat floor is 203″. The raised shelf up front is the Mom’s Attic over the cab.

Open the 20 ft U-Haul in the planner →

26 ft U-Haul

The 26 ft U-Haul is 314 in (798 cm) long inside including the Mom’s Attic, with 283 in (23 ft 7 in) of flat floor. It is 97 in (246 cm) wide and 99 in (251 cm) tall. The attic shelf is 31 in deep and 60 in above the floor. With about 1 in of insulation and paneling on each surface, the inside is about 313 × 95 × 97 in. Payload is about 12,859 lb.

BARE INTERIOR L × W × H
314 × 97 × 99″ (798 × 246 × 251 cm)
INSULATED AND PANELED, ABOUT
313 × 95 × 97″
FLOOR LENGTH
23 ft 7 in flat, 26 ft 2 in with the attic

U-Haul’s 26 ft truck, the largest one they rent. The flat floor is 283″. The raised shelf up front is the Mom’s Attic over the cab.

Open the 26 ft U-Haul in the planner →

Common questions

Why is the 15 ft U-Haul shorter than 15 feet inside?+

The 15 ft size includes the Mom’s Attic over the cab. Inside, the truck is 174 inches long at the attic level, with 143 inches of flat floor, just under 12 feet. A box truck seller would call it a 12 or 14 footer.

Can you build on the Mom’s Attic?+

Yes. Builders use it for storage or a sleeping platform. In the planner you can place items on the shelf at its published height.

How much space do insulation and paneling take?+

The finished figures on this page allow about 1 inch per surface: each side wall, the ceiling, the floor, and the front wall. The rear is the door. A cold-climate build with thicker insulation takes more. In the planner you can choose the build-out level, or enter your own measurements.

CHOOSING YOUR VEHICLE

Why choose a box truck conversion? Space, layout, and tradeoffs

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Updated 2026-10-14.