# Deck & Patio Cost Calculator — Materials, Labour & Permits

> Free deck cost calculator: estimate decking, framing, footings, railing, stairs, labour and permits with low / expected / high ranges. Compare a deck vs a patio over the same footprint. Metric and imperial, all client-side.

Turn deck dimensions and options into a transparent material take-off plus labour, footing, permit and contingency allowances — with a low / expected / high range and an optional patio comparison.

- **HTML page:** https://siteometry.com/en/tools/deck
- **Category:** [Framing & Carpentry](https://siteometry.com/en/tools/category/framing-carpentry)
- **Figures live on the page:** tables, diagrams and worked figures the text refers to ("the table below") are drawn by the page and are not reproduced here. Each section below links to its anchor on the page.
- **Runs in the browser:** Siteometry calculators need no account and send no input anywhere — every number below is computed on the visitor's own device.

## How to estimate a deck

1. **Choose units & currency** — Pick metric or imperial and your currency; every field follows.
2. **Set scope & material** — Choose new, resurface or replace, the attachment, and the decking material tier.
3. **Add deck sections** — Enter each rectangle's length, width and copies; add sections for L-shaped decks.
4. **Set foundation & height** — Pick the foundation type and deck height, plus railed sides and stair runs.
5. **Tune costs & labour** — Open Costs & labour to edit material prices, labour mode, permit and allowances.
6. **Read the range** — Use the expected total and its low–high range to size a budget and check quotes.

_On the page: https://siteometry.com/en/tools/deck#howto_

## Deck & patio cost overview

A deck budget is more than square footage. The cost is driven by size, height, attachment, material tier, railing, stairs, footings, demolition and how hard the site is to work. This calculator turns those choices into a transparent material take-off plus labour, permit, waste and contingency allowances.

Because prices vary heavily by region, every unit cost is editable, and the result is shown as a low / expected / high range rather than a single false-precise number. Everything runs in your browser — nothing you type is uploaded.

_On the page: https://siteometry.com/en/tools/deck#deck-guide-intro_

## How much does a deck cost?

As a rough planning anchor, a contractor-built deck commonly lands somewhere between a budget pressure-treated build and a premium composite or PVC build with railing and stairs. Material tier and labour are usually the two biggest levers, followed by height, railing length and foundation type.

Rather than quote one number, set your own material, labour and permit rates and read the expected figure with its range. Treat the output as a planning estimate to size a budget and sanity-check quotes — not as a fixed price.

_On the page: https://siteometry.com/en/tools/deck#how-much-deck-cost_

## How this calculator works

The tool keeps two engines separate: a quantity engine that calculates how much material your deck needs, and a cost engine that prices it using rates you control. That separation is what keeps the estimate trustworthy when prices change.

Add one or more rectangular sections for L-shaped or multi-level decks. Pick the scope, attachment, material, foundation and height, then tune any rate. The results rail updates live with the cost range, breakdown and take-off.

_On the page: https://siteometry.com/en/tools/deck#how-calculator-works_

## Material take-off formulas

Quantities come from your dimensions and a few standard spacings. Framing, beam, post and footing counts are deliberately simple planning assumptions — not an engineered span design.

_On the page: https://siteometry.com/en/tools/deck#quantities-explained_

## The cost model & ranges

Each quantity is multiplied by an editable unit price to build cost buckets: material, labour, demolition and permit. Contingency, overhead and tax are then layered on as percentages.

The range comes from per-bucket uncertainty: material prices are reasonably knowable, while labour and permits swing more by region and access. Low sums the optimistic ends, high the pessimistic ends, and expected sits in between.

_On the page: https://siteometry.com/en/tools/deck#cost-model_

## Deck vs patio

Over the same footprint, a patio uses a completely different model: excavation, a compacted gravel base, a sand bed, a paver or poured surface and edge restraint — no framing, footings, railing or stairs. The comparison mode prices both and shows which drivers explain the gap.

Cost is only part of the decision. A raised deck suits sloped or uneven ground and gives you storage underneath; a patio is lower-maintenance and often cheaper on flat, accessible sites. The maintenance notes summarise the trade-off.

_On the page: https://siteometry.com/en/tools/deck#deck-vs-patio_

## Worked examples

Two worked take-offs that show how the quantities fall out of your dimensions. Your prices will differ — these illustrate the method.

_On the page: https://siteometry.com/en/tools/deck#examples_

## Common mistakes

The most common budgeting errors are forgetting railing and stairs (often a large share of cost), ignoring demolition and disposal on a replacement, leaving out a permit allowance, and trusting a single number instead of a range.

Site access and height are also routinely underestimated — both push labour up well beyond the per-area base rate.

_On the page: https://siteometry.com/en/tools/deck#mistakes_

## Frequently asked questions

Common questions about estimating the cost of a deck or a patio.

### How much does it cost to build a deck?

It depends mostly on size, material tier, height, railing and labour. Enter your dimensions and rates and read the expected total with its low–high range; the tool builds it from a material take-off plus labour, footing, permit and contingency allowances.

### What is the cost per square foot of a deck?

The results rail shows cost per area (per ft² or per m²) for the whole project. It is the grand total divided by deck area, so it already includes labour, railing, stairs, footings, permit and contingency — not just decking boards.

### How many footings does a deck need?

The tool estimates one footing per support post, from your beam and post spacing. It is a planning figure: the actual number depends on beam sizing, joist span and local code, so treat it as a starting point for a structural design.

### Does attached vs freestanding change the cost?

Yes. An attached deck carries one edge on a ledger bolted to the house, so it needs one fewer beam line and fewer posts and footings. A freestanding deck supports every edge on its own posts.

### Do I need a permit for a deck?

Often, especially for attached or raised decks and larger footprints — but the rules are local. The calculator flags when a permit is more likely and lets you budget an allowance; it does not state any specific municipality's requirements.

### Is composite more expensive than wood?

Composite and PVC cost more upfront than pressure-treated wood but need far less maintenance. Switch the material tier to see the upfront difference, and read the maintenance notes in the comparison panel for the long-term trade-off.

### Is a deck or a patio cheaper?

On flat, accessible ground a patio is often cheaper because it skips framing, footings, railing and stairs. On sloped or uneven sites a deck can win. Turn on the comparison to price both over the same footprint.

### How accurate is the estimate?

It is a planning estimate, not a quote. Deck costs vary with region, access, soil, code and contractor workload, which is why the tool shows a range and lets you edit every rate. Use it to size a budget and check quotes.

### Does it work in metric and imperial?

Both. Switch units at the top and every dimension, quantity and rate converts. Areas show in m² or ft², lengths in m or ft, and footing concrete in m³ or ft³.

### Is the calculator private?

Yes. Every calculation runs in your browser. Nothing you enter is uploaded, and your project is saved only in your own browser's local storage.

_On the page: https://siteometry.com/en/tools/deck#faq_

## Related calculators

- [Deck Railing & Baluster Spacing Calculator](https://siteometry.com/en/tools/deck-railing-calculator)
- [Deck Joist & Beam Span Calculator](https://siteometry.com/en/tools/deck-joist-beam-span-calculator)
- [Fence Calculator — Posts, Rails, Pickets & Concrete](https://siteometry.com/en/tools/fence-calculator)
- [Board Foot Calculator — Lumber, Volume & Cost](https://siteometry.com/en/tools/board-foot-calculator)