Precast concrete window sills typically cost $20-$75 per linear foot for the sill itself, or about $45-$125 per linear foot installed. Total price depends on sill dimensions, finish, order quantity, access, removal of old material, and local labor rates.
Assumptions: Standard residential openings, ordinary access, and U.S. contractor pricing; custom profiles and small jobs may cost more per foot.
| Item | Low | Average | High | Notes |
|---|---|---|---|---|
| Precast sill material | $20/LF | $40/LF | $75/LF | Standard to custom profiles and finishes |
| Installed sill | $45/LF | $80/LF | $125/LF | Includes typical setting labor |
| One 3-foot window | $135 | $240 | $375 | Installed; minimum charges may apply |
| Five 3-foot windows | $675 | $1,200 | $1,875 | Installed, before major removal or repairs |
| Old sill removal | $8/LF | $20/LF | $40/LF | Separate charge when demolition is required |
What a precast sill costs by linear foot
For a standard residential sill, material commonly runs $20-$45 per linear foot. Installed pricing is often $45-$90 per linear foot when the opening is accessible, the sill is a regular profile, and no structural repair is needed. Higher-end or complicated projects can reach $90-$125 per linear foot.
A typical 3-foot window sill costs about $135-$270 installed, while a custom or difficult replacement can approach $375. A contractor may also set a minimum service charge, so replacing one short sill can cost more per foot than ordering several sills at once.
These ranges assume a cast concrete unit with a sloped top and a modest drip edge, installed in a standard masonry or framed opening. They do not automatically include new flashing, major wall repairs, painting, interior trim, or extensive demolition. For a quote, the relevant measurement is usually the sill’s total length, not the window’s glass area.
How materials, setting labor, and removal shape the quote
A contractor’s estimate may combine the sill, fabrication, delivery, installation, and disposal in one line. Asking for separate amounts makes it easier to compare bids and identify whether a low price excludes necessary work. The component ranges below are approximate and may not add up exactly to the installed total because minimum charges and overhead are distributed differently.
| Quote component | Typical price | What it covers | When it rises |
|---|---|---|---|
| Precast material | $20-$75/LF | Standard or custom concrete profile | Thicker, wider, colored, or special-order units |
| Fabrication and finish | $5-$25/LF | Molds, edge shape, texture, and production | Small runs or nonstandard dimensions |
| Setting labor | $20-$50/LF | Mortar bed, alignment, and sealing | Heavy units, upper floors, or tight access |
| Removal and disposal | $8-$40/LF | Breaking out and hauling the old sill | Reinforced concrete or careful removal needs |
| Delivery and equipment | $75-$350/job | Local delivery or handling equipment | Long distances, heavy loads, or restricted access |
| Permits and overhead | $0-$300/job | Applicable permit and contractor costs | Local rules or broader exterior repairs |
Labor can be estimated as . Masonry or concrete crews often charge $60-$110 per hour per worker, although many quote a fixed rate per opening. A two-person crew may complete straightforward replacement work faster than a solo worker, but access and curing requirements affect the schedule.
Width, thickness, and profile changes the concrete sill price
Dimensions are a major material-price driver. A sill that is 4-6 inches deep with a standard bullnose or chamfered edge generally costs less than a 7-10-inch-deep unit with a custom profile. A thicker sill may also require extra handling, stronger support, or a deeper installation bed.
Length affects both material and fabrication. A common 2-4-foot residential unit is usually easier to source than a sill longer than 6 feet. Long pieces can require special molds, careful transport, or a joint plan to avoid cracking. Color additives, exposed aggregate, polished faces, and matching an existing historic profile can add roughly 15%-50% over a basic gray unit.
Confirm the finished dimensions and slope before ordering; a mismatch can turn a low material quote into rework or replacement expense. The sill should project past the exterior wall and direct water away from the opening. The needed projection varies with the wall assembly and details, so the installer should verify it on site rather than relying on a generic dimension.
Quantity also matters. A fabricator may charge a setup or mold fee for a single custom piece, while a batch of several matching sills spreads that expense across the order. For example, a custom mold fee of $150-$500 can be noticeable on one opening but relatively modest across ten windows.
How long installation takes and what labor includes
Replacing one accessible sill often takes 2-5 labor hours, excluding unusual curing or wall-repair work. A small project of four to six standard openings may take one workday, while a larger home or a job involving heavy demolition can take several days. Crews may need additional time if the exterior must remain protected while mortar or sealant sets.
Installation labor typically includes preparing the opening, applying a setting bed, placing and leveling the sill, and sealing joints. Rates may be quoted at $20-$50 per linear foot or as a per-opening fee, often around $100-$300 for straightforward setting work. A small-job minimum of $250-$600 is common for mobilization, even when the measured footage is low.
Upper-story windows, narrow side yards, scaffolding needs, and access through occupied rooms can increase labor. If a sill weighs more than workers can safely position by hand, lifting equipment or extra crew members may add $150-$700. A quote should state whether it includes protection for adjacent masonry, cleanup, and final joint sealant.
Three residential quotes for different sill scopes
These examples illustrate how dimensions and job conditions affect a total. They are not fixed national rates; local labor, material availability, and contractor minimums can move an estimate substantially.
| Project | Scope and labor | Approximate total | Price basis |
|---|---|---|---|
| One standard opening | 3 LF, basic gray sill, 3 labor hours, no removal | $250-$450 | $45-$90/LF plus small-job minimum |
| Five window replacements | 15 LF, remove old units, 15-22 labor hours | $1,000-$2,000 | $55-$105/LF plus disposal and setup |
| Custom wide sills | 24 LF, 8-inch depth, special finish, upper-floor handling | $2,200-$4,000 | $90-$165/LF including added handling |
In the first example, the per-foot equivalent looks high because mobilization and setup are spread over only one opening. In the second, repeated dimensions allow more efficient installation. The custom example includes a higher unit rate for special fabrication and access rather than simply applying a standard sill price.
Compare quotes on the same footage, profile, removal scope, and finish—not only on the final total. Ask whether the number covers delivery, disposal, sealing, and repair of the surrounding masonry; omitted work can make one bid appear cheaper than another.
Regional labor rates and delivery shift installed prices
Prices in major coastal cities and high-cost metro areas are often 15%-35% above the national middle range. Dense urban sites may also require parking, street access, elevator coordination, or scaffolding. In lower-cost rural and Midwestern markets, straightforward labor can be 5%-20% below the middle range, although a distant precast supplier can erase that difference.
Delivery is especially important because concrete is heavy and custom products may ship from a regional plant. A local order may incur $75-$200 for delivery, while a remote or small-load delivery can reach $200-$500. Some suppliers apply minimum order quantities or charge extra for a dedicated trip when the order contains only one or two pieces.
Season and scheduling affect labor more than the concrete itself. In cold regions, freezing weather can complicate mortar installation and extend the schedule; crews may use cold-weather protection or defer the work. During busy exterior construction periods, contractor availability can also increase the quote by roughly 5%-15%, particularly for rush scheduling.
Removal, flashing, and wall repairs that add expense
Removing an existing concrete sill usually adds $8-$40 per linear foot, depending on thickness, reinforcement, and how much surrounding masonry must be protected. A brittle or poorly bonded sill may come out quickly, while a reinforced unit set into the wall can take several hours per opening. Debris hauling may be included or charged separately at $100-$400 per project.
Water damage around the opening can be a more substantial cost than the sill itself. Replacing damaged sheathing, brick, or framing may add $200-$1,500 per window; extensive masonry reconstruction can exceed that range. Flashing and water-management work commonly adds $50-$250 per opening when the installation requires new membranes, metal flashing, or more involved sealing.
Permits are not always required for a like-for-like sill replacement, but local rules can change if the work affects an opening, historic facade, or structural masonry. Permit and inspection fees may be $0-$300 for a small job, with additional costs for required plan review or code upgrades. The contractor should identify whether the estimate assumes a simple repair or includes code-related changes.
When repair or standard gray concrete saves money
If the existing sill is stable and damage is limited to a small crack or failed joint, resealing or patching may cost $100-$400 per opening. That can be economical when there is no water intrusion or significant deterioration. Replacement is more appropriate when the sill is loose, broken through, badly spalled, or no longer sheds water; a patch should not hide a continuing drainage problem.
Standard gray concrete with a stock profile is usually the lowest-cost choice. A custom color or decorative edge can increase the sill price without improving water control. Matching existing details may be worthwhile on a visible historic facade, but for less prominent windows, a simple shape and consistent finish can keep fabrication costs down.
Ordering multiple windows together reduces separate delivery and setup charges. Grouping replacement work with other planned masonry repairs can also avoid paying mobilization twice. Before approving a package price, check that the included sill dimensions are correct and that the contractor has not priced unnecessary demolition or upgrades.
Cost control comes from keeping the scope clear, using repeatable dimensions, and avoiding custom finishes unless appearance requires them. Obtain at least three written estimates when the project is substantial, and compare material grade, labor, removal, delivery, sealing, and warranty terms line by line. Ask each bidder to note assumptions and any conditions that could trigger added charges.
For an initial budget, multiply total sill length by about $45-$90 per linear foot for a standard installation, then add removal, access, repairs, or custom fabrication where needed. A one-window job may fall below that calculation once a contractor’s minimum charge is applied, while a multi-window order generally tracks the per-foot range more closely.