Sealing your deck protects it from weather damage, extending its lifespan. Here’s a breakdown of what to expect:
1. Total Cost
- Average Cost: $964
- Typical Range: $554–$1,376
- Low-End: $250
- High-End: $2,500
2. Cost Per Square Foot
- Professional Labor + Materials: $0.75–$4 per sq. ft.
- DIY Materials Only: $0.25–$1 per sq. ft.
| Deck Size (Sq. Ft) | Deck Dimensions | Average Cost (With Labor) |
|-------------------------|---------------------|--------------------------------|
| 80 | 10x8 | $190 |
| 144 | 12x12 | $342 |
| 272 | 17x16 | $646 |
| 320 | 30x10 | $760 |
3. Cost Factors
Sealant Type
- Oil-Based: $0.15–$0.20 per sq. ft.
- Better weather resistance but slower drying.
- Water-Based: $0.20–$0.25 per sq. ft.
- Easier to apply and eco-friendly.
- Stain/Sealant Hybrid: $30–$60 per gallon
- Adds color while protecting the deck.
Labor
- Cost: $0.50–$3 per sq. ft. or $40/hour
- Complex Decks (stairs, multiple levels): Up to $7 per sq. ft.
Prep Work
- Power Washing: $280 (or DIY for $50–$500)
- Sanding/Stripping Old Sealant: $2 per sq. ft.
4. Cost to DIY
- DIY Total: $25–$400
- Sealant: $20–$60 per gallon
- Tools:
- Power washer (rented): $50/day
- Brushes, rollers, or sprayers: $20–$60
Savings: Save 50–75% by DIYing but risk uneven application or damage.
5. Add-On Costs
- Deck Staining: $550–$1,250
- Deck Repairs: $800–$3,200
- Power Washing: $185–$385
- New Deck Installation: $4,125–$11,650
6. Ways to Save Money
Do the Prep Yourself
- Clean or power wash the deck to save up to $400.
Apply Thin Coats
- Use thin layers of sealant to avoid waste and peeling.
DIY for Simple Decks
- Apply sealant yourself for smaller or less complex decks.
7. Deck Waterproofing Tips
- Wait 30 days before sealing a newly built deck.
- Reapply sealer every 1–3 years.
- Seal on a non-windy day with temperatures between 50–90°F.
- Avoid applying on a damp or frosty surface for an even coat.
By maintaining your deck regularly, you protect your investment and enjoy a beautiful outdoor space for years to come.
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