A mudroom addition costs $12,000 on average nationally, with most homeowners spending between $6,500 and $18,000, according to Angi (updated October 2026)1. HomeAdvisor – corporate sibling publishing matching figures, which alone do not establish independent corroboration – reports the same $12,000 average and $6,500 to $18,000 typical range (updated June 2026)2. Fixr publishes a higher national average of $14,500 within an average range of $12,000 to $18,000 (updated January 2025)3; the averages diverge across publishers, and no conclusion about which applies follows from the differences. Per square foot, Angi puts new additions at $100 to $300 and conversions of existing space at $50 to $1001; Fixr puts micro additions and interior conversions at $100 to $200 and larger additions at $100 to $3003 – separately published figures that diverge on conversions, with no conclusion about which applies.
Cost by size
Angi and HomeAdvisor publish an identical size table split by project type (2026, matching figures, corporate siblings)12. Angi's page shows a typographical error in the 81 sq ft addition cell; the figures below are as published by HomeAdvisor2:
| Size (sq ft) | Conversion, average cost (Angi/HomeAdvisor, 2026) | New addition, average cost (Angi/HomeAdvisor, 2026) |
|---|---|---|
| 36 | $1,800 – $3,600 | $3,600 – $10,800 |
| 49 | $2,500 – $4,900 | $4,900 – $14,700 |
| 64 | $3,200 – $6,400 | $6,400 – $19,200 |
| 81 | $4,100 – $8,100 | $8,100 – $24,300 |
| 100 | $5,000 – $10,000 | $10,000 – $30,000 |
| 120 | $6,000 – $12,000 | $12,000 – $36,000 |
Fixr publishes its own size table with labor included, not split by project type (2025)3:
| Size (sq ft) | Fixr cost, labor included (2025) |
|---|---|
| 36 (6' x 6') | $3,600 – $7,200 |
| 49 (7' x 7') | $5,000 – $15,000 |
| 60 (7¾' x 7¾') | $6,000 – $18,000 |
| 72 (8½' x 8½') | $7,000 – $21,000 |
| 100 (10' x 10') | $10,000 – $30,000 |
| 120 (10' x 12') | $12,000 – $36,000 |
Cost by location
Angi's figures by location in the home (2026)1:
| Location in home | Angi average cost range (2026) |
|---|---|
| Basement | $3,000 – $10,000 |
| Bump-out (new foundation) | $18,000 – $36,000 |
| Garage | $3,000 – $10,000 |
| Living room | $3,000 – $10,000 |
| Porch | $6,000 – $18,000 |
| Rear deck / patio | $6,000 – $18,000 |
Fixr's figures by location, labor included (2025)3:
| Location | Fixr cost, labor included (2025) |
|---|---|
| Front door | $3,600 – $7,200 |
| Closet | $3,600 – $7,200 |
| Garage | $3,600 – $10,000 |
| Kitchen | $3,600 – $10,000 |
| Living room | $3,600 – $10,000 |
| Outdoor | $3,600 – $30,000 |
| Back of house | $4,900 – $36,000 |
| Basement | $7,350 – $25,000 |
| Porch (conversion to four-season room) | $20,000 – $40,000 |
The porch and basement figures diverge substantially between the two publishers; each is labeled with its source, and no conclusion about which applies follows from the differences.
Component costs
Fixr's cost breakdown by project component, labor included (2025)3. Fixr states the construction line covers framing, exterior finishing, interior wall finish work, electrical work, and insulation, and excludes flooring, HVAC, storage, specialty wallcoverings, and plumbing:
| Component | Fixr cost, labor included (2025) |
|---|---|
| Construction | $25 – $60 per sq ft |
| Flooring | $2 – $214 per sq ft |
| Walls | $5 – $33 per sq ft |
| Countertops | $20 – $250 per sq ft |
| Additional storage | $20 – $3,800 per item |
| Bench | $80 – $2,000 per item |
| Plumbing | $150 – $4,000 per item |
| Custom lockers | $500 – $1,500 per linear ft |
Features and add-ons
Angi's figures (2026)1:
| Feature | Angi average cost (2026) |
|---|---|
| Mudroom lockers | $500 – $1,250 |
| Mudroom cubbies | $150 – $500 |
| Shelving units | $100 – $300 each |
| Built-in shelves | $300 – $600+ |
| Laundry connections | $500 – $750 |
| Folding station | $100 – $400 |
| Utility sink | $200 – $500 |
| Hose bib installation | $150 – $500 |
| Pet washing station | $1,000 – $2,000 |
| Painting | $250 – $750 ($2 – $6 per sq ft) |
| Post-construction cleanup | $100 – $1,000 |
| Permits | $125 – $1,000 (average $250) |
| New foundation pour (bump-out) | $1,000 – $5,000 |
| Exterior framing, siding, roofing (bump-out) | $3,000 – $8,000 |
Angi's finish-type figures, units as stated by the publisher (2026)1: accent wall painting at $1 to $40 per square foot, crown molding at $4 to $23 per linear foot, a Dutch door at $3,000, recessed lighting at $180 per fixture, and shiplap at $300 to $800.
Fixr's figures (2025)3:
| Feature | Fixr cost (2025) |
|---|---|
| Shoe rack | $20 – $200 installed |
| Coat rack | $20 – $1,400 installed |
| Pantry | $300 – $3,000 installed |
| Sink cabinet | $300 – $3,800 installed |
| Bench, prefab by type | $80 – $2,000 per item |
| Bench, custom | $165 – $500 per linear ft |
| Lockers, prefab by type | $150 – $2,500 per unit |
| Lockers, custom | $500 – $1,500 per linear ft |
| Faucet | $150 – $300 installed |
| Sink | $200 – $1,000 installed |
| Dog shower | $2,000 – $4,000 installed |
| Shower | $2,000 – $4,000 installed |
| Washer and dryer installation | $850 – $2,500 |
| Refrigerator (second unit) | $1,000 – $3,000 |
| Radiant floor heating | $10 – $25 per sq ft |
| Laundry room / mudroom combination | $6,400 – $19,200 |
HomeAdvisor's add-ons table lists a dog wash area at $1,000 to $2,000 while its text states $2,000 to $3,000 for the same feature, and the table duplicates those rows; both figures are excluded here for the internal conflict (2026)2.
Electrical and trade task costs
Angi puts an electrician at $50 to $130 per hour, with per-task figures of $200 to $300 per outlet, $150 to $6,000 per light fixture, $85 to $200 per light switch, and $150 to $350 per ceiling fan installation (2026)1. Angi's per-square-foot trade task figures for new construction work (2026)1:
| Trade task | Angi cost per sq ft (2026) |
|---|---|
| Framing | $7 – $16 |
| Roofing | $4 – $11 |
| Siding | $3 – $12 |
| Foundation | $5 – $12 |
| Drywall installation | $1.50 – $3 |
| Flooring | $3 – $25 |
HomeAdvisor publishes the same $3 to $25 per square foot flooring figure (matching figures, corporate siblings)2. Fixr publishes flooring by material, installed (2025)3:
| Flooring type | Fixr cost per sq ft, installed (2025) |
|---|---|
| Vinyl | $2 – $14 |
| Rubber | $4 – $12 |
| Concrete | $5 – $30 |
| Cork | $6 – $16 |
| Slate | $7 – $20 |
| Tile | $9 – $214 |
| Hardwood | $14 – $32 |
| Brick | $16 – $24 |
Fixr's wall finish figures, installed (2025)3: accent wall at $5 to $30 per square foot, board and batten at $9 to $23, shiplap at $9 to $23, and wall panels at $12 to $33. These diverge from Angi's finish-type figures above; each is labeled with its publisher, and no conclusion about which applies follows from the differences.
Labor
General contractors charge an additional 10% to 20% of the total project cost – $1,200 to $2,400 on a $12,000 mudroom addition (Angi, 2026)1. HomeAdvisor publishes matching contractor fee figures and adds that contractors may charge $50 to $150 per hour for smaller tasks (2026, matching figures, corporate siblings)2.
Addition vs. conversion
Angi puts building a new mudroom addition at $18,000 to $36,000 on average and converting an existing space at $3,000 to $10,000 (2026)1. Fixr's low-end project is $3,600 for a 36 sq ft conversion from existing space with ready-made shelves and new flooring, and its high-end project is $36,000 for a 120 sq ft addition with stone flooring, custom built-in cubbies and benches, an HVAC extension, insulation, a sink, washer/dryer, and countertops (2025)3.
Hiring a mudroom contractor
Angi recommends asking your pro to walk you through every element of the estimate – materials, labor, permits, electrical, plumbing, and finishing work – and discussing how long each phase will take and what might cause delays (2026)1. For flooring, fixtures, and other products, follow the exact product's manufacturer instructions.
Related guides
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See our guides to home addition cost, garage conversion cost, screened-in porch cost, and sunroom cost.