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.
The more elaborate your deck design and the choice of materials will increase the cost of the deck, so keep those factors in mind. The cost of a professionally built pressured-treated wood deck starts at about $15 per square foot, including materials.The cost for an elaborately built deck using costly hardwoods or composite materials can run about $35 per square foot.ell your provider how much the new deck cost to build so that insurance coverage can be added to your policy. If the replacement value for your home is $200,000 and the deck cost $3,000, the policy will be increased to reflect the replacement cost of the new deck.