How Long Does It Take to Install a Window Well?

Quick Answer

A basic window well installation — attaching a prefabricated well to an existing basement window — takes 4–8 hours for an experienced DIYer or contractor. If the project includes cutting a new egress window opening in the foundation wall, the total time extends to 2–3 days, as concrete cutting and framing add significant labor.

Time Breakdown by Project Type

Project Scope	Estimated Time
Window well only (existing window)	4–8 hours
Window well + new egress window	2–3 days
Window well with drainage system	6–10 hours
Window well cover installation only	30–60 minutes

Installation Steps and Timing

1. Excavation (1.5–3 hours)

The largest time investment is digging. You need to excavate an area roughly 8–12 inches wider than the window well on all sides and deep enough for the bottom of the well to sit at least 6 inches below the window sill. For a standard egress-sized well, this means removing approximately 1.5–3 cubic yards of soil.

Hand digging with a shovel takes 2–3 hours. Renting a mini excavator reduces this to 30–60 minutes but requires access to the area and adds equipment cost.

2. Drainage Preparation (45 minutes–1.5 hours)

Proper drainage is essential to prevent water from pooling in the well and leaking into the basement:

• Dig an additional 12–18 inches below the bottom of the well
• Place a layer of landscape fabric
• Install a 4-inch perforated drain pipe connected to the footing drain (if accessible)
• Fill with 12–18 inches of clean gravel (3/4-inch stone)

Skipping the drainage step saves time but creates a serious risk of basement water intrusion during heavy rain.

3. Securing the Window Well (30–45 minutes)

Position the prefabricated well (galvanized steel, composite, or masonry) against the foundation wall, centered on the window. Attach it using concrete anchors or masonry screws spaced 12–16 inches apart. Most wells have pre-drilled mounting holes.

Apply waterproof sealant (such as hydraulic cement or polyurethane caulk) between the well and the foundation wall to prevent water from seeping behind it.

4. Backfilling (45 minutes–1 hour)

Backfill around the outside of the well with the excavated soil, compacting it in 6-inch lifts to prevent settling. Grade the soil away from the foundation to direct surface water away from the well.

5. Finishing Touches (15–30 minutes)

• Install a window well cover (polycarbonate dome or flat grate) to keep out debris, rain, and snow
• Add a window well ladder or steps if required by egress code
• Restore landscaping around the area

Egress Code Requirements

If the window well serves an egress window (required for every basement bedroom), it must meet specific building code requirements. The International Residential Code (IRC) requires:

• Minimum 9 square feet of floor area in the well
• Minimum 36 inches of projection from the foundation wall
• A permanently attached ladder or steps if the well depth exceeds 44 inches

Failing a building inspection adds days to the project timeline, so verify local code requirements before starting.

DIY vs. Professional Installation

Factor	DIY	Professional
Time for well only	6–8 hours	4–6 hours
Time with egress window	Not recommended	2–3 days
Cost (well only)	$150–$400 materials	$500–$1,500 installed
Cost with egress window	N/A	$2,500–$5,000+

DIY installation is practical for adding a well to an existing window. Cutting a new egress opening in a concrete or block foundation requires specialized tools (concrete saw, jackhammer) and structural knowledge, making professional installation strongly recommended.

Factors That Affect Installation Time

• Soil type: Rocky or clay-heavy soil takes significantly longer to excavate
• Access: Tight spaces between the house and fence or neighboring structures slow digging
• Foundation type: Poured concrete is harder to drill into than block
• Drainage complexity: Tying into existing footing drains adds time
• Permit process: Some municipalities require inspections that add days to the timeline