The contractor bids your project for a specific price and that is how much it will cost...in theory. For small, simple projects, you can probably count on this contract to work for you and for your contractor.However, for larger and more complex projects, the final cost is likely to be higher.he contractor bids your project for a specific price and that is how much it will cost...in theory. For small, simple projects, you can probably count on this contract to work for you and for your contractor. However, for larger and more complex projects, the final cost is likely to be higher.
Decks are less expensive than most other home additions. And because decks are so popular, they also make homes more marketable and valuable. Here's a look at what they cost. For basic designs using the least expensive lumber, you can expect to pay from about $6 to $8 per square foot of deck area.Even if you choose top-of-the-line redwood lumber or want a hot tub, material costs are still reasonable, anywhere from $20 to $35 per square foot.ere's a look at what they cost. For basic designs using the least expensive lumber, you can expect to pay from about $6 to $8 per square foot of deck area. Even if you choose top-of-the-line redwood lumber or want a hot tub, material costs are still reasonable, anywhere from $20 to $35 per square foot.
Composite decking price will be around $4,000 as well for a 400 square foot deck. Also remember that you may have to include design accessories such as railings and stairs. Include deck railing prices in your estimates before beginning to build. How much does it cost to build a deck also depends on the size.hile it may be the easiest addition to any house, many homeowners over look the cost of a deck. Before starting your DIY deck building project, make sure to look into the price of the construction. The cost to build a deck will depend on the size, the materials used, and the overall design of the deck and fence.