Why Do Bathroom Remodeling Quotes Vary So Much?

Bathroom remodeling quotes vary because contractors rarely price the same project. One proposal includes demolition, waterproofing, plumbing, electrical, permits, glass, tile, fixtures, and cleanup. Another prices labor and leaves tile, fixtures, permits, and anything found behind the walls to you. Both say "complete bathroom remodel" on the first page. On the North Shore, that difference alone can put $20,000 between two quotes for the same room.

At Delta Remodels we've priced bathrooms in Northfield and Lake Forest for 39 years, and we've seen plenty of competing proposals homeowners bring to a consultation. This guide explains where the gaps hide, in scope, allowances, materials, plumbing, exclusions, and change orders, and ends with the checklist we'd use to compare three quotes.

What Actually Changes a Bathroom Quote

A quote is only useful once you know which column each contractor was working from. Our bathroom remodeling service page lists what a full remodel includes with us, so you have a baseline to check other proposals against.

The Cheaper Quote Isn't Always Cheaper

Here's a made-up but typical pair of proposals for a hall bathroom in a 1960s Northfield ranch.

Contractor B looks $13,000 cheaper. Add $4,500 for tile, $3,800 for a vanity and quartz top, $1,500 over the fixture allowance, $2,400 for glass, $900 for permits, and $1,200 for painting, and the gap is about $1,300 before anyone has opened a wall. Neither pricing model is wrong. The problem is assuming both totals cover the same things.

Scope: "Bathroom Remodel" Is Not a Scope of Work

A proposal should let you answer, line by line, what's being removed, rebuilt, supplied, and finished. "Install new shower" can mean a drop-in acrylic base with a surround or a tiled curbless shower with a linear drain, niche, bench, and frameless glass. Those jobs are $8,000 to $20,000 apart on the North Shore.

The same applies to vanities. A stock vanity set against existing plumbing is a different job from a custom double vanity with a stone top, relocated supplies, wall-mounted faucets, and outlets inside the drawers. When one contractor assumed the first and another priced the second, their totals shouldn't match.

Our process settles this before we price anything. In Northfield and Lake Forest, layout, cabinetry, tile, flooring, fixtures, lighting, and finishes are coordinated as one specification, and you get a written fixed-price proposal only after those selections are approved. That's slower than a same-day estimate. It also means the number you sign is built from real products, not placeholders.

Allowances: Where Low Quotes Hide

An allowance is money reserved for an item you haven't chosen yet. "Tile allowance: $3,000" doesn't mean the tile you want costs $3,000. It means the contractor set aside $3,000 and you'll pay the difference.

Before you compare quotes, ask each contractor two things about every allowance:

• What does the dollar figure cover? Tile only, or tile plus trim, mosaics, thresholds, waste, delivery, and tax? Installation labor is almost never in the allowance, and a herringbone or mosaic layout costs more to set than straight field tile.
• Is it realistic for the finish level I want? A $1,500 vanity allowance against a $4,200 vanity you've already picked is a $2,700 gap before construction. The lower quote didn't save you money. It postponed the decision.

The same applies to plumbing fixtures, countertops, glass, lighting, and mirrors. If you're comparing an allowance-heavy quote to a fully specified one, add what you actually intend to spend to the allowance quote first.

Materials: Who Is Buying What

Homeowners often ask why a quote is still high when they're supplying the tile, vanity, and fixtures. The answer is that finish materials are the part you see. Construction materials are the part you don't.

"Customer supplies materials" needs clarification. Does that mean decorative finishes, or everything? Also ask who orders, receives, inspects, and stores owner-supplied items, and who pays when a tile lot arrives short or a vanity arrives damaged. When we supply materials, we own those problems. When you supply them, most contractors don't.

Plumbing: The Line That Moves the Most

Keeping the toilet, shower, and vanity where they are is cheaper than moving them. Relocating plumbing on the North Shore typically adds $10,000 to $25,000, because it means opening the floor, rerouting drains and vents, new valves, and a plumbing permit (Delta Remodels, Bathroom Remodel Cost on the North Shore, 2026). A quote that includes relocation shouldn't be compared to one that assumes every fixture stays put.

But "nothing is moving" doesn't mean no plumbing cost. A full remodel still disconnects every fixture, replaces the shower valve, resets the drain, connects a new vanity, and installs trim. And in a Lake Forest home built between 1890 and 1960, or a Northfield ranch from the 1950s, opening the wall often exposes cast iron drains, undersized venting, or a subfloor that's been wet for decades. We carry a 15 to 20 percent contingency on any home built before 1960 for exactly this reason, and hidden conditions in pre-war North Shore homes commonly add $5,000 to $15,000 once walls are open.

Ask each contractor to state what plumbing is replaced, what is relocated, what stays, and what happens if the drain line is cast iron.

Electrical, Ventilation, and Waterproofing

These three are easy to miss because they're finished over. Check each quote for:

• Electrical. New circuits for a heated floor or bidet seat, a hardwired LED mirror, recessed and shower lighting, GFCI outlets, and a dedicated 20-amp bathroom circuit. A heated-floor bathroom is a different electrical job from the same room with plain tile.
• Ventilation. Fan replacement in the same box, or new ducting to the exterior on a humidity sensor? Older North Shore homes often have a fan venting into the attic, which has to be corrected.
• Waterproofing. The quote should name the system (Schluter, Laticrete, Wedi, or equivalent), describe the pan construction, and state whether the walls are waterproofed or just covered with backer board. "Per code" tells you nothing. Waterproofing is the single item you'll never see and the one most likely to cause a $15,000 repair if it's done wrong.

Design and Permits: Included or Assumed?

Some quotes price construction from a finished plan. Some include the design. Some expect you to make every decision alone and source every product. All three are legitimate, and all three should be visible in your comparison. A construction-only price can reasonably be lower because you're doing more of the work.

Permits are the same. If a proposal says "permits by owner" or "permit fees not included," write that down. It's not buried in the total. Local requirements also differ:

• Northfield routes permits through the Community Development Department at 361 Happ Road (847-784-3551). Substantive remodels require a Floor Area Ratio Worksheet with the permit packet, a stricter layer than most neighboring villages.
• Lake Forest routes permits through the City's Community Development Department. Interior bathroom renovations generally clear without commission review, and the City encourages a permit even for a same-location tear-out and replacement.
• Wilmette requires a licensed architect or engineer stamp for projects over $25,000 or involving structural work.

We submit, coordinate, and close permits on every Northfield bathroom remodel and Lake Forest bathroom remodel. If a competing quote doesn't say who does, ask.

There's also a legal floor. Under the Illinois Home Repair and Remodeling Act, any home repair or remodeling job over $1,000 requires a written contract or work order stating the total cost and listing parts and materials "with reasonable particularity," plus the contractor's business name and address (815 ILCS 513/15). Contractors must also give you the state's "Home Repair: Know Your Consumer Rights" pamphlet before you sign. A single-line proposal for a $40,000 bathroom doesn't meet that standard.

Exclusions: Read These Before the Inclusions

The exclusions section explains a price gap faster than the total does.

A lower quote with nine exclusions may cost more in the end than a higher quote with two. That doesn't make the lower contractor dishonest. It means you compare the anticipated final cost, not the opening number.

Change Orders and Fixed Price vs. Estimate

A change order alters scope, price, or schedule after signing. Some are your choice: you add a heated floor or upgrade the tile. Some come from conditions nobody could see: a rotted joist under the tub. What a change order should never be is the first time you learn that obvious parts of the bathroom were never in the quote.

An estimate is an expected cost based on what's known at the time. A fixed-price proposal is a contract price for a defined scope. The key words are defined scope. A fixed price doesn't survive moving a wall or swapping porcelain for marble. It does mean the contractor has priced the work that's actually on paper.

Before signing, ask every contractor:

1. What triggers a change order?
2. Will I see a written price before the extra work starts?
3. Does a selection upgrade also change installation labor?
4. How are hidden conditions documented and priced?
5. Can a change order extend the schedule, and by how much?

Our answer to the second question is always yes. Nothing outside the signed scope starts without a written change order you've approved.

Why Northfield and Lake Forest Quotes Differ From Each Other

Even inside the North Shore, two similar-size bathrooms don't need the same work. Northfield's housing is mostly 1950s to 1980s Ranch and Colonial homes, and our Northfield bathroom projects run about $18,000 to $32,000 for a same-footprint refresh, $20,000 to $55,000 for a full remodel, and $60,000 to $120,000 or more for a primary suite. Lake Forest homes are often 1890s to 1960s Georgian, Colonial, and French Country estates with tub-heavy layouts and undersized showers, and projects there run $15,000 to $30,000 for a refresh, $30,000 to $55,000 for a full remodel, and $55,000 to $100,000 or more for a primary suite.

Room size matters less than what's in the room. A 70-square-foot bathroom holds more plumbing, electrical, waterproofing, cabinetry, and tile per square foot than any other room in the house. That's why our North Shore bathroom remodel cost guide prices by scope rather than square footage, and why our accessible bathroom cost guide treats a curbless shower as its own line item.

The Bathroom Quote Comparison Checklist

Make a column for each contractor and mark every row Included, Allowance, Owner supplied, Excluded, or Not stated. "Not stated" is the most important category. Ask before you sign rather than assume.

Demolition and structure

• Demolition scope (to studs, or surfaces only)
• Debris removal and dumpster
• Framing, blocking, or wall changes
• Subfloor inspection and repair

Shower and wet areas

• Pan construction and drain type
• Waterproofing system, named
• Niche, bench, curb or curbless
• Shower glass
• Tile allowance, pattern, and setting materials

Fixtures and cabinetry

• Vanity, countertop, sinks
• Toilet, faucets, shower trim
• Mirror or medicine cabinet, lighting
• Who orders, receives, and stores each item

Plumbing and electrical

• Rough plumbing replaced, relocated, or existing
• Valve replacement
• New circuits, GFCI, heated floor
• Exhaust fan and ducting

Paperwork and process

• Design services and renderings
• Permits and inspections, who pulls them
• Painting and final cleaning
• Warranty term and what it covers
• Payment schedule
• Change-order procedure
• Allowances and exclusions listed in full
• Start and completion dates

Once every proposal reflects roughly the same scope, compare the totals again. The gap usually makes sense.

Comparing quotes for a bathroom in Northfield or Lake Forest? Bring them to a Delta Remodels consultation. We'll walk through what each one includes and leaves out, at no charge, before you sign anything.

Sources

• Illinois General Assembly, Home Repair and Remodeling Act, 815 ILCS 513/15 (Written contract), retrieved 2026-09-19, https://www.ilga.gov/Legislation/ILCS/Articles?ActID=2359&ChapterID=67
• City of Lake Forest, Community Development, Building Permits, retrieved 2026-09-19, https://www.cityoflakeforest.com/departments/community_development/building_permits.php
• Village of Northfield, Applications, Forms and Guidelines, retrieved 2026-09-19, https://www.northfieldil.org/192/Applications-Forms-Guidelines
• Delta Remodels, "Bathroom Remodel Cost on the North Shore: What $25K to $100K Buys You in 2026," Katarzyna Pindral, May 4, 2026, retrieved 2026-09-19, https://www.deltaremodels.com/blog/bathroom-remodel-cost-north-shore-2026/
• Delta Remodels, "Bathroom Remodeling in Northfield, IL," retrieved 2026-09-19, https://www.deltaremodels.com/services/bathroom-remodeling/northfield/
• Delta Remodels, "Bathroom Remodeling in Lake Forest, IL," retrieved 2026-09-19, https://www.deltaremodels.com/services/bathroom-remodeling/lake-forest/
• Delta Remodels, "Accessible Bathroom Remodel Cost in North Shore (2026)," retrieved 2026-09-19, https://www.deltaremodels.com/blog/accessible-bathroom-remodel-cost-north-shore-2026/