Deck Building Cost Calculator – Estimate Prices of Trex Composite, PVC and Pressure Treated Wood Decks

Do you want to know How Much It Costs to Build A Deck? Prices range from $20 / sq.ft. for Pressure Treated (PT) wood deck to over $40 / sq.ft. for an AZEK PVC decks, with Composite decking being somewhere in the middle. But these numbers don't tell the real story.

This deck building calculator will help you estimate prices for a deck, based on your specifications - size, type of railing, material type, etc. Prices are also adjusted for your geographic location.

Calculate Deck Construction Costs Now:

Deck Size Sq. Ft.
Number of Railing Posts (6 ft spacing)
Project Type
Decking Material
Build Stairs
Railing Type
US Region:


Low End
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Mid Range
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High End
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To get an accurate estimate, it's important that you enter all details properly. First, enter the size of your project. You can later adjust this.

Wooden Deck Railing PostsDeck Size:

Second, enter the number of railing posts. This is an important factor can change your estimate by a few hundred dollars. In the default settings, we include a deck size of 360 s.f. and 10 posts.

Railing Posts:

If your deck is attached to the house wall, and is sized at 12' x 30' (360 s.f.), you will have 3 posts on each 12' run, and additional 4 posts on the long side (corner posts were included on short sides). This gives you a total of 10 posts. If your deck geometry is different, you may have more or fewer posts.

It is ideal to keep post span at 6 feet between posts, which is a standard length of railing sections. However, you can space them more frequently - for example at 4 or 5 feet apart. However, this will result in waste of materials. You should not exceed 6 ft. spacing between railing posts, as that can make using your deck unsafe.

Choosing Project Type

If you are looking to build a deck, chances are that you will need to construct all supporting structures from scratch. Therefore, most people should choose "Build New Deck + Footings"

This means that in your estimate you are also including pouring new concrete footings that will support your deck.

If you already have a deck and need to "renew" it with Pressure Treated or Composite material, but want to leave old framing in place (maybe do few small repairs as well) select "Replace Boards and Railings Only".

If you already have a deck, but it's in bad shape, and the frame is rotted - you should remove both the old deck and frame, and build new one. However, you can reuse old footings. In this case select "New Deck + Rebuild Frame"

Composite Deck with Patio Furniture

Choosing Decking Material

We provide 5 material options, that are widely used in US and Canada - Pressure Treated Wood, Trex (or similar grade) Composite, AZEC PVC (or similar), Cedar / Redwood and "Store Brand" Composite Decking. Each of these materials has their pros and cons, which are beyond the scope of this calculator. We will have separate guides to explain the benefits of each.

What's important here is the cost of each material, as well as future maintenance. See the table below that shows costs of each material, as well as total building prices:

NOTE - Material cost is for DECKING BOARDS only, and does not include frame, footings, railings, fasteners, etc.

Decking Material Material Cost / sq. ft. Installed Cost / sq. ft.
Pressure Treated (PT) Wood $2.3 - $2.7 per sq.ft $19 - $25 per sq.ft
TREX Composite or Similar $4.9 - $6.3 per sq.ft $32 - $38 per sq.ft
AZEC PVC or Similar $7.8 - $8.5 per sq.ft $39 - $43 per sq.ft
Redwood / Cedar $4.5 - $7.5 per sq.ft $33 - $45 per sq.ft
Noname (1st Gen) Composite Decking $3.8 - $4.5 per sq.ft $31 - $36 per sq.ft

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