Vinyl Siding Coverage

When estimating vinyl siding quantities, add up square footage, and add 10% for waste. As with wood siding estimates, do not deduct the area of windows and doors. This will provide an allowance for waste. If the window and door areas are over 50 sq. ft. (such as garage doors or sliding glass doors), deduct 75% of the total openings. For dormers and gable-end walls, add 1 ft. in height to the original measurements to allow for waste.


Estimating Siding Accessories

Add up lin. feet of outside and inside corners needed, and add 10% for waste. Include other trim accessories, as shown in the figure below.

Figure: Estimating Siding Accessories
  Amt. Required per 1,000 sq. ft. of Siding
Starter Strip 100 lin. ft.
J-Trim 1 200 lin. ft.
Utility trim 2 30 lin. ft.
H-Trim 3, 12 in. 60 pieces
H-Trim 4, 9 3/8 in. 80 pieces
Vinyl, metal, and hardboard siding require trim accessories, such as those listed in this table. Check with the siding manufacturer for its suggested siding trim package.


  1. Typically available in 12-ft. lengths

  2. Typically available in 12-ft. lengths

  3. Available to cover butt joints between hardboard panels (see Hardboard Siding Checklist).

  4. Available to cover butt joints between hardboard panels (see Hardboard Siding Checklist).

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