Want to sell or simply improve your home? Forbes magazines lists the renovations that will get you the most bang for your buck, and which are better left undone. First up, the 10 best projects.

Vinyl Window Replacement -- This costs $11,066 on average with an average resale value of $7,920. The cost recouped is 72%.

Attic Bedroom Addition -- The average cost is $51,428. The average resale value is $37,142, putting the cost recouped at 72%.

Wood Window Replacement -- On average, replacing wood windows costs $12,027 with an average resale value of $8,707. The cost recouped is 72%.

Vinyl Siding Replacement -- The average cost is between $11,357 and $13,973. The average resale value is between $8,223 and $10,119. The cost recouped is 72%.

Wood Deck Addition -- On average, this costs $10,973. The average resale value is $7,986. The cost recouped is 73%.

Minor Kitchen Remodeling -- On average, this costs $21,695 with an average resale value of $15,790. The cost recouped is 73%.

Fiber-Cement Siding Replacement -- The average cost is $13,382. The average resale value is $10,707, putting the cost recouped at 80%.

Mid-Range Garage Door Replacement -- The average cost is $1,291, with an average resale value of $1,083. Cost recouped is 84%.

Entry Door Replacement (Steel) -- On average, this costs $1,218 with an average resale value of $1,243, putting the cost recouped at 102%.

Here are the 10 worst renovations for your dollar, according to Forbes magazine.

Mid-Range Bathroom Remodel -- The average cost is $16,634 with an average rescale value of $10,668. The cost recouped is 64%.

Master Suite Addition -- The average cost is $108,090 and the average resale value is $68,146, putting the cost recouped at 63%.

Family Room Addition -- The average job cost is $85,740. The average resale value is $53,624, putting the cost recouped at 62%.

Entry Door Replacement (Fiberglass) -- The average cost is $3,576 with the average resale value at $2,147. The cost recouped is 60%.

Garage Addition -- The average midscale job cost is $60,608 with an average resale value of $35,876. The cost recouped is 59%.

Bathroom Addition -- The average job cost is $40,710 and the average resale value is $21,695, putting the cost recouped at 53%.

Sun Room Addition -- The average cost is $75,224 with an average resale value of $36,540. The cost recouped is 49%.

Backup Power Generator -- The average cost is $14,718 with an average resale value of $7,136. The cost recouped is 49%.

Home Office Remodeling -- The average cost is $28,888 with the average resale value of $13,235. The cost recouped is 46%.