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IRC R310 · Window well · Foundation cut · Drain

Basement egress window cost calculator

A code-sized basement egress window, well and drain commonly costs $4,000 to $10,000 installed. Cutting a poured foundation costs more than opening a block wall. The window is not a bedroom until the opening, the well and the ladder meet the emergency-exit rules. This is a building-code cost tool, not a permit approval.

Reviewed 25 October 2026 · Written by Mantu Kumar

See the photo · See the cost diagram · Open the calculator

Written and maintained byMantu Kumar

Evidence review17 October 2026

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Key facts at a glance

• Installed range: about $4,000–$10,000 for one opening, well and basic interior finish.
• Poured concrete saw-cutting often adds $800–$2,500 versus a concrete-block wall.
• IRC R310 net clear opening is 5.7 sq ft (5.0 sq ft at grade), at least 24 in high and 20 in wide. Sill no higher than 44 in.
• Window well needs at least 36 in of projection and 9 sq ft of area when the sill is below grade. Deeper than 44 in needs a ladder or steps.
• A drain in the well, tied to daylight or a storm line, is what keeps the new opening from becoming a leak.

Cost bands from 2025–2026 egress installer ranges. Dimensions follow the widely used IRC R310 emergency-escape rules. Your city adopts its own edition.

2026 planning ranges

1. 1Saw-cut poured wall + header
2. 2Casement egress window unit
3. 3Window well · steel to composite
4. 4Ladder or steps when deep
5. 5Gravel & drain to the footing tile
6. 6Permit · about $200–$500
7. 7Interior trim + finish
8. 8Block or poured wall
9. 9Openings in this job

IRC R310 opening: Net clear ≥ 5.7 sq ft (5.0 at grade floor) Width ≥ 20 in · height ≥ 24 in Ladder if the well is > 44 in deep

Typical installed: $4,000–$10,000; poured walls cost more to cut than block walls.

• Net clear is the opening a person can pass, not the catalog size of the frame.
• Well must be large enough to stand in and climb from.
• Drain keeps the well from filling and pushing water at the new window.

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Diagram, part by part

Basement egress window: every numbered part explained

The basement egress window drawing above has 9 numbered parts, from Saw-cut poured wall + header to Number of openings. Each card below frames one of them, and after you run the calculator it shows what that part adds to your estimate.

1. 1 Saw-cut poured wall + header

   A concrete saw cuts the opening in the foundation wall, and a header or lintel carries the load above it. Block walls may need the cores filled with concrete around the new opening.

   What moves it: Wall type, wall thickness and opening size.

   On the quote: Ask how the opening will be supported and whether a structural detail is provided.

2. 2 Casement egress window unit

   Egress windows are usually casements because they open fully. Code calls for about 5.7 square feet of clear opening, at least 20 inches wide and 24 inches high, with the sill no more than 44 inches above the floor.

   What moves it: Window size, material and glass package.

   On the quote: Ask for the clear opening dimensions of the window model, not just its frame size.

3. 3 Window well

   steel to composite

   The window well holds back the soil outside the opening. Galvanized steel is cheapest; composite and stone-look wells cost more but look better and do not rust.

   What moves it: Well size, material and depth.

   On the quote: Ask whether a well cover is included and that it can be opened from inside.

4. 4 Ladder or steps when deep

   When the well is deeper than about 44 inches, a permanent ladder or steps are required so someone can actually climb out in an emergency.

   What moves it: Well depth.

   On the quote: Ask whether the ladder or steps are built into the well.

5. 5 Gravel & drain to the footing tile

   Gravel and a drain at the bottom of the well, tied to the footing drain or run to daylight where possible, keep the well from filling with water against the glass.

   What moves it: Distance to the footing drain or daylight.

   On the quote: Ask where the well drain will connect.

6. 6 Permit

   about $200–$500

   A new egress opening changes the structure and the fire safety of the room, so most towns require a permit and an inspection of the opening size and well.

   What moves it: Your town's fee schedule.

   On the quote: Ask who pulls the permit and when the inspection happens.

7. 7 Inside trim and wall finish

   Basic finish included

   Inside, the cut wall around the new window needs framing, insulation, drywall returns and trim. The calculator includes a basic finish; tile or wood returns in a finished basement cost more.

   What moves it: How finished the basement is and the trim style.

   On the quote: Ask exactly what interior finish is included around the window.

8. 8 Block or poured wall

   Poured walls cost more to cut

   Poured concrete walls are cut with a large wall saw; block walls are cut along the joints and the cores around the opening are filled. Poured walls usually cost more to open.

   What moves it: Wall type and thickness.

   On the quote: Tell the contractor your wall type before they quote.

9. 9 Number of openings

   Each opening priced in full

   Every basement bedroom needs its own egress opening. Each window adds its own cut, unit, well and drain, though setup costs are shared when several are done together.

   What moves it: How many bedrooms or living areas need egress.

   On the quote: Ask for a per-window price and a total for doing them together.

Emergency exit

The well is part of the exit, not landscaping

A finished egress opening is a window, a well, a way to climb out, and a place for water to leave. A small hopper window in a shallow well can look done and still fail the measurement an inspector takes.

Measure the opening the person uses, not the brochure. These close-ups are crops of the same AI-generated illustration.

01Clear opening

Net clear opening

Height, width and area after the sash is open. 5.7 square feet is the usual above-grade rule. Grade-floor openings can be 5.0.

02Well and ladder

Sill and well

Sill at most 44 inches above the floor. Well at least 36 inches out and 9 square feet when the well is required. A ladder if the well is deeper than 44 inches.

03Gravel and drain

Water

Gravel with no drain is a bucket. Ask where the well drain goes, and whether the interior trim and a permit are in the quote.

Before you sign a quote or file a claim, verify these three details

Foundation

Block or poured, and who patches the interior.

Well size

Projection, area, ladder and cover.

Drain

Daylight, storm connection, or a dry well — written down.

Replacing a window that is already an egress opening? Use the window calculator →

Egress window cost (2026)

One new basement exit. Interior painting of the whole basement is not included.

The size rules that make it an exit

IRC R310 is the section inspectors cite for a basement bedroom. The net clear opening — the hole you can actually pass through when the window is open — is 5.7 square feet in most locations and 5.0 square feet when the sill is at or below grade. The opening also has to be at least 24 inches high and 20 inches wide, and both minimums at once do not multiply to 5.7, so a window can meet each side and still fail the area.

The sill can be no more than 44 inches above the finished floor. If the window sits in a well, the well needs 36 inches of projection out from the wall and 9 square feet of floor area. If the well is deeper than 44 inches, a permanently attached ladder or steps is required. A cover has to be openable without tools.

Cities amend this. Check which code year your city has adopted before you order the window. The calculator prices the physical work. It does not issue the bedroom.

Worked example: one poured-wall opening

Insurance and a new exit

• Adding a bedroom exit is a home improvement. It is not a claim.
• A covered break of an existing egress window — impact, a fallen tree — is a window claim. Price the unit on the window calculator and the well only if the well was damaged.
• Tell the insurer if the new bedroom changes how the home is used or its rebuild cost. Coverage A is about the house, not the permit.
• Age and ACV apply when you are replacing a damaged unit, not when you are cutting the first opening.

Egress window cost by region

The calculator's default egress window job, repriced for each of its six regions. At the national average it runs $3,750 – $7,800; South / Lower Midwest is the lowest at $3,263 – $6,786, and West Coast metro is the highest at $4,875 – $10,140, a gap of about $2,483 at the midpoint.

What “Foundation” does to the price

Every other input stays at its default and only “Foundation” changes. The cheapest choice, Concrete block, comes to $3,750 – $7,800; the most expensive, Poured concrete, comes to $4,550 – $10,000.

What “Well drain” does to the price

Every other input stays at its default and only “Well drain” changes. The cheapest choice, No drain in this quote, comes to $3,350 – $6,300; the most expensive, Drain to daylight or a line, comes to $3,750 – $7,800.

How age changes the egress window claim payout

Using the default job, a $1,000 deductible and a 30-year expected life. At 10 years old, about $1,925 is held back as depreciation; a replacement cost policy releases it after the work is finished, while an actual cash value policy keeps it.

Quote checklist: 7 items to verify

Egress quotes need both the structural cut and the code details spelled out.

1. Opening and header. Size of the cut and how the wall above is supported.
2. Window model. Clear opening width, height and area, not just the frame size.
3. Sill height. No more than about 44 inches above the floor.
4. Window well. Material, size and a cover that opens from inside.
5. Ladder or steps. Required when the well is deep.
6. Drainage. Gravel and a drain tied to the footing drain or daylight.
7. Interior finish and permit. Trim, drywall returns, permit and inspection.

How long the job takes

Concrete cutting is loud and dusty; ask how the basement will be protected from slurry and dust.

Common mistakes that raise the cost

• Buying by frame size. Code is based on the clear opening, not the frame.
• High sills. A sill above about 44 inches does not meet egress rules.
• No ladder in a deep well. Deep wells need a permanent way to climb out.
• No well drain. Wells without drainage fill with water against the glass.
• Skipping the permit. Unpermitted bedrooms can cause problems at sale.

Ways to keep the cost down

Planning the opening carefully saves money.

• Choose a standard window size. Meets code without custom orders.
• Pick a simple well. Steel wells cost less.
• Do several openings together. Shared setup.
• Plan the drain early. Avoids later water problems.
• Finish the interior yourself. If comfortable.
• Check permit requirements early. Avoids delays.

Signs you need an egress window

Safety and code drive this decision.

• A basement bedroom. Requires egress.
• Finishing a basement. Living space needs a way out.
• Selling the home. Bedroom count needs egress.
• Small existing windows. Too small to escape.
• No second exit. Safety concern.

Sources and further reading

• NAIC — Actual cash value vs replacement cost coverage
• International Code Council — IRC overview
• ReplaceCost window calculator
• HomeGuide — Egress window installation cost

Frequently asked questions