How Much Does It Cost to Tear Down a Building
Cost to demolish a house
House demolition costs $4 to $10 per square foot or up to $25 per square foot with asbestos or lead. The average cost to knock down or bulldoze a 1,500 square foot house is $6,000 to $15,000. The average cost to tear down and rebuild a house is $125,000 to $450,000.
House size (square feet) | Average cost |
---|---|
800 | $3,200 – $8,000 |
1,000 | $4,000 – $10,000 |
1,200 | $4,800 – $12,000 |
1,500 | $6,000 – $15,000 |
2,000 | $8,000 – $20,000 |
2,500 | $10,000 – $25,000 |
3,000 | $12,000 – $30,000 |
3,500 | $14,000 – $35,000 |
*Includes disposal, clean-up, and basic site grading.
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Table of contents
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- Cost to demolish a house
- Cost calculator
- Average costs
- House demolition cost per square foot
- Mobile home
- Cost to tear down and rebuild a house
- New utility lines
- Partial demolition prices
- Garage
- Porch or deck
- Shed or barn
- Swimming pool
- Concrete patio
- Chimney
- Foundation
- Roof
- Driveway
- Interior walls
- Extensions or additions
- Commercial demolition costs
- Cost factors to tear down a house
- Permits and inspections
- Utility lines
- Asbestos, lead, or rodents
- Septic tank
- Site clean-up and grading
- Demolition vs. deconstruction costs
- Frequently asked questions
- How to find and hire a demolition contractor
- Demolition companies near me
Average house demolition cost
The following table shows the average cost to demolish a house from 1,500 to 2,500 square feet.
National average cost | $14,000 |
Minimum cost | $3,000 |
Maximum cost | $35,000 |
Average range | $6,000 to $25,000 |
*Based on 32 project costs reported by HomeGuide members.
House demolition cost per square foot
House demolition costs $4 to $10 per square foot on average, depending on the size and location. Demolishing a house while leaving the foundation in place costs $3 to $7 per square foot.
Demolition type | Average cost per square foot |
---|---|
House | $2 – $5 |
Foundation | $1 – $3 |
Disposal | $1 – $2 |
Total | $4 – $10 |
*Includes clean-up and basic site grading.
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Mobile home demolition cost
Mobile home demolition and disposal costs $2 to $4 per square foot or $2,000 to $5,000 on average. Mobile home removal costs $1,000 to $2,000 for transport to a landfill if the unit is still movable. Mobile home demo costs depend on the size, material, and location.
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Cost to tear down and rebuild a house
Tearing down and rebuilding a house costs $125,000 to $450,000 on average or $104 to $165 per square foot. Hire a local architect before demolition to save time and money by determining if any house parts are reusable, such as the foundation.
House square feet | Demolition cost | Rebuild cost | Total cost |
---|---|---|---|
800 | $3,200 – $8,000 | $80,000 – $124,000 | $83,200 – $132,000 |
1,000 | $4,000 – $10,000 | $100,000 – $155,000 | $104,000 – $165,000 |
1,200 | $4,800 – $12,000 | $120,000 – $186,000 | $124,800 – $198,000 |
1,500 | $6,000 – $15,000 | $150,000 – $232,500 | $156,000 – $247,500 |
2,000 | $8,000 – $20,000 | $200,000 – $310,000 | $208,000 – $330,000 |
2,500 | $10,000 – $25,000 | $250,000 – $387,500 | $260,000 – $412,500 |
3,000 | $12,000 – $30,000 | $300,000 – $465,000 | $312,000 – $495,000 |
3,500 | $14,000 – $35,000 | $350,000 – $542,500 | $364,000 – $577,500 |
*Fees include building permits, architect costs, & installing new utility lines.
Local zoning laws govern the size, type, and location of new home rebuilds. Urban and suburban areas typically restrict rebuilds to the footprint or floorplan size of the original home.
Utility lines cost when rebuilding a house
Replacing or installing all-new utility lines in their existing location makes up $8,000 to $30,000 of the total rebuilding cost. Costs include permits and inspections for water, sewer, gas, and electric lines.
- Total utility costs are $13,000 to $45,000 to remove all old lines and install new lines in new locations when building a larger home. Excavating lines prevents building on top of abandoned lines and is required by some municipalities.
- Total utility costs are $1,200 to $3,000 when reconnecting the new rebuild to existing utility lines near the old foundation, including permit and inspection fees. This method uses the home's original floorplan.
- Removing electrical lines and installing a temporary power supply for builders costs $2,000 to $3,200.
Builders don't always include fees for reconnecting or installing utilities in their initial estimates.
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Partial demolition prices
Partial home demolitions are often necessary during home remodeling projects. A partial demolition that preserves a small section of the home is more expensive and requires careful planning. Demolition expenses are typically eligible for a tax write-off.
Demolition type | Average cost |
---|---|
Detached garage | $1,000 – $5,000 |
Inground swimming pool | $4,000 – $16,000 |
Above ground swimming pool | $300 – $2,500 |
Hot tub | $150 – $350 |
Porch / Deck | $675 – $2,250 |
Patio | $1,500 – $2,800 |
Complete chimney | $3,000 – $6,000 |
Partial chimney | $500 – $2,500 |
Shed | $400 – $1,500 |
Barn | $2,000 – $7,000 |
Roof (replacing) | $5,000 – $11,000 |
Driveway | $600 – $1,800 |
Concrete-slab foundation | $2,000 – $6,000 |
Non-load bearing wall | $500 – $2,000 |
Load-bearing wall | $4,000 – $10,000 |
Extension / Addition | $800 – $2,400 |
*Additional fees apply for demolition permits, if required.
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Garage demolition cost
Garage demolition costs $3 to $10 per square foot or $1,000 to $5,000 on average, depending on the size and material. Tearing down a detached brick garage costs $1,500 to $5,000, while a wooden garage costs $1,000 to $3,500 to demolish.
Material | Average cost (1-car) | Average cost (2-car) |
---|---|---|
Wood | $1,000 – $2,500 | $1,500 – $3,500 |
Brick | $1,500 – $4,000 | $2,000 – $5,000 |
*Concrete foundation removal costs an additional $1 to $3 per square foot.
Porch or deck tear down cost
A porch demolition costs $675 to $2,250 on average, depending on the complexity and accessibility. Deck demolition and removal costs $3 to $10 per square foot. Multi-story decks, porches with heavy metal railings, or deep-set posts increase labor costs.
Size (feet) | Average cost |
---|---|
12'x12' | $425 – $1,450 |
15'x15' | $675 – $2,250 |
12'x24' | $850 – $2,900 |
*Includes debris disposal.
Alternatively, small deck repairs cost $100 to $500, and extensive deck repairs cost $500 to $2,500.
Cost to bulldoze a shed or barn
- Removing an old shed costs $4 to $10 per square foot, including disposal.
- Demolishing a 150- to 500-square-foot shed costs $400 to $1,500 on average, depending on the material and foundation type.
- Bulldozing a large wooden barn costs $2,000 to $7,000 or more. Selling reclaimed barn wood can recoup part of the demolition costs.
Swimming pool demolition cost
Swimming pool removal costs $4,000 to $16,000 for an inground pool and $300 to $2,500 for an above-ground pool. Hot tub removal costs $150 to $350.
Concrete patio demolition cost
Concrete patio demolition costs $1,500 to $2,800 on average or $5 to $10 per square foot, including disposal. Demolishing a stone-paver patio costs $1 to $5 per square foot, depending on whether the base is sand or cement. Demolition labor increases with hard-to-reach areas.
Chimney demolition cost
A complete fireplace and chimney removal costs $3,000 to $6,000, depending on the size and location. Partial chimney demolition costs $500 to $2,500 for tearing out everything above or below the roofline.
- Additional roof repair costs may apply for damages incurred during removal.
- Alternatively, repairing a chimney costs $200 to $1,200 on average, while a chimney rebuild costs $1,000 to $3,500 (above the roof).
Foundation demolition cost
Demolishing a concrete slab foundation costs $2,000 to $6,000 on average or $1 to $3 per square foot, depending on the depth. Removing a concrete basement costs $3 to $5 per square foot since it requires major excavation. Building a new foundation costs $5,000 to $19,500 on average.
Foundation type | Average cost per square foot |
---|---|
Concrete slab | $1 – $3 |
Basement | $3 – $5 |
Roof demolition cost
Demolishing and replacing a roof costs $5,000 to $11,000 on average. Roof demolition and reconstruction costs $350 to $1,000 per 100 square feet, depending on the material. Complex layouts, steeper inclines, and hard-to-access roofs increase labor costs.
Driveway demolition cost
Driveway demolition costs $600 to $1,800 on average or $1 to $3 per square foot, including debris removal. Total costs depend on the material, size, thickness, pavement condition, and local disposal fees.
Demo interior walls
- Interior demolition costs $100 to $300 per wall or $0.50 to $1.50 per square foot, not including disposal, refinishing, or call-out fees.
- Removing a wall costs $500 to $2,000 when it's non-load bearing or $4,000 to $10,000 for a load-bearing wall, including disposal and refinishing.
- Multi-story homes, rerouting utility lines, and structural engineer fees to redesign a home's floorplan increase the total cost.
Cost to knock down extensions or additions
Demolishing a house extension costs $800 to $2,400 on average or $2 to $6 per square foot. These prices don't include fees to refinish the home's exterior. Total costs depend on the home addition's size, materials, and level of integration with the rest of the house.
Square feet | Average cost |
---|---|
200 | $400 – $1,200 |
400 | $800 – $2,400 |
600 | $1,200 – $3,600 |
*Foundation removal adds $1 to $3 per square foot.
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Commercial demolition costs
Commercial demolition costs $4 to $7 per square foot, depending on the project size, building materials, and location. Commercial building demolition companies use heavy machinery, decreasing the cost for larger projects. Asbestos and foundation removal increase the overall cost.
Building type | Average total cost |
---|---|
Shop (1,000 SF) | $4,000 – $7,000 |
Restaurant (2,000 SF) | $8,000 – $14,000 |
Office (8,000 SF) | $32,000 – $56,000 |
Warehouse (12,000 SF) | $48,000 – $84,000 |
*Includes debris disposal.
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Cost factors to tear down a house
The most variable cost factors to demolish a house include:
- Size – Total square footage and number of stories
- Location – Higher labor and permit fees in cities than rural areas
- Accessibility – Proximity to other structures, land geography, and layout
- Demolition method – Partial, complete teardown, mechanical, or deconstruction
- House material – Expensive brick demolition vs. cheaper wood demolition
- Foundation type – Crawlspace, slab, or basement foundation
- Foundation removal vs. reusing – Excavating and filling fees for removing
- Environmental – Asbestos, rodents, and lead removal charges
- Permits and inspections – Most cities require permits and pre- and post-demolition inspections.
- Historical preservation – Higher permit fees for demolishing landmarks
- Preparing utilities – Cutting or removing utility lines
- Site preparation requirements – Temporary fences and nets for safety regulations
- Clean-up and dump fees – Increase for big cities and long distances to the dumpsite
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Demolition permit
A standard house demolition permit costs $100 to $450+, while permits to demolish historic landmarks costs $300 to $10,000. Cities won't issue permits until after utilities are cut and the house is free of hazardous materials.
Permits to tear down and rebuild on the same foundation are cheaper than rebuilding on a new, larger foundation.
Pre-demolition inspections
Most home demolitions require 2 to 5 inspections that cost $100 to $700 each, depending on local code requirements. Older homes also need asbestos and lead-paint checks before a demolition project. Cutting utilities requires inspections in some cities.
Inspection type | Average cost |
---|---|
Building inspection cost | $100 – $500 |
Asbestos | $300 – $900 |
Lead-paint (with x-ray testing) | $160 – $700 |
Rodents | $100 – $300 |
Utility line termination inspections | $100 – $150 each |
Full-service demolition companies manage inspections and utilities, while others require the property owner to handle the work.
Utility preparation before demolition
Demolition requires cutting or removing utility lines. Inspections and permits for capping pipes cost $100 to $150 each when required.
- Homeowners should make utility termination requests at least 2 to 4 weeks before demolition.
- When rebuilding, don't request removal of all electrical lines because temporary power is needed for construction.
- Ask utilities if temporary water supply is mandatory for dust control regulations during demolition.
- Work requiring opening up the sidewalk or street is much more expensive.
Cutting utilities
Before demolition, cutting utilities costs $600 to $3,800 when planning to rebuild on the existing foundation. These prices also apply for reconnecting the utility lines when rebuilding. Utility companies require reconnecting lines within 2 to 5 years.
Utility type | Average cost |
---|---|
Gas | $0 – $300 |
Electric | $0 – $300 |
Water line (cut & cap above ground) | $250 – $450 |
Water line (cut & cap underground) | $450 – $1,400 |
Sewer (cut & cap) | $350 – $1,500 |
Well (cap & seal) | $50 – $500 |
*All fees include typical permit and inspection costs.
Removing utility lines
Cutting and removing all utilities before demolition costs $5,000 to $14,500 when there are no rebuilding plans within 2 to 5 years. These fees also apply when rebuilding a home with a larger floorplan that requires new utility lines.
Utility type | Average cost to remove |
---|---|
Gas | $650 – $2,450 per line |
Electric (above ground) | $0 – $870 per line |
Electric (underground) | $450 – $1,200 per line |
Water | $2,000 – $5,000 per line |
Sewer | $2,000 – $5,000 per line |
Well (Seal & abandon) | $500 – $4,000 |
*All fees include inspection and permit costs.
Cost of tearing down a house with asbestos, lead, or rodents
Demolishing a house with asbestos costs $8,000 to $45,000, depending on the home's size and the affected area. Asbestos removal costs $2 to $15 per square foot, depending on the type of material removed. Lead removal costs $8 to $15 per square foot.
Removal service | Average total cost | Cost factors |
---|---|---|
Asbestos | $2,000 – $30,000 |
|
Lead | $10,000 – $30,000 |
|
Rodents | $200 – $600 |
|
Homes built before or during the 1970s often have asbestos or lead. Removing asbestos is a safety hazard and requires professional abatement at least two weeks before demolition.
Septic tank filling or removal
Filling an empty septic tank with dirt costs $1,200 to $1,800 on average. Completely removing a septic tank costs $3,000 to $5,000, depending on its size and condition.
Old underground septic tanks collapse and create dangerous sinkholes unless filled with gravel or dirt. Some states also require removing leach field lines.
Demolition disposal and clean-up cost
Demolition clean-up costs $1,500 to $3,000 on average, or $1 to $2 per square foot, depending on the distance to the dumpsite and local dump fees. Including debris removal is standard, but some contractors charge separately or hire a disposal service.
- Dumpster rentals cost $300 to $700 per week, including delivery, pickup, and 1 to 6 tons of free waste disposal.
Site grading
Post-demolition site grading costs $500 to $3,000 on average, depending on the site size, soil, and accessibility. Tractor backfilling costs $3 to $6 per cubic yard for filling in a removed foundation or basement. Before rebuilding, the ground needs leveling and compacting.
Work type | Average cost |
---|---|
Grading | $0.50 – $5.00 per square foot |
Backfill | $3 – $6 per cubic yard |
*Grading costs increase for inclined areas, depths greater than 4" to 6," or clay soils.
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Demolition vs. deconstruction costs
Deconstructing a house costs $10,000 to $35,000, but tax deductions from donating salvageable materials offset part or all of the fees. Mechanical demolition costs $6,000 to $25,000 on average with heavy equipment but offers no tax benefits from recycling old materials.
- Deconstruction is carefully dismantling the building by hand to salvage reusable materials.
- Demolition is mechanically tearing down an entire house and hauling everything to a landfill or recycling center.
Type | Cost per square foot | Details |
---|---|---|
Demolition | $4 – $10 |
|
Deconstruction | $8 – $16 |
|
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Salvageable materials to donate to Habitat for Humanity or a deconstruction firm include:
- Appliances
- Doors and windows
- Cabinets
- Light fixtures
- Dimensional lumber
- Wood flooring
- Marble, bricks, and stones
- Sinks, toilets, and bathtubs
- Copper piping and wiring
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Frequently asked questions
What is the process to demolish a house?
Steps to demolish a house:
- Letters of demolition approval (mortgage lenders, historic preservation board, environmental and health departments)
- Demolition permit application
- Inspections & land surveys
- Hazardous materials removal (asbestos, lead paint, rodents)
- Cutting utilities
- Demolition permit collection
- House demolishing
- Foundation removal
- Debris disposal
- Backfill & site grading
Is it cheaper to remodel or tear down and rebuild?
Tearing down and rebuilding a house costs $125,000 to $400,000, while a whole-house remodel costs $20,000 to $100,000 on average and is faster. A tear-down-and-rebuild is a better long-term solution, updates all the materials, and increases energy efficiency.
Method | Average cost per square foot |
---|---|
Tear down and rebuild | $104 – $165 |
Whole-house remodel | $15 – $60 |
Kitchen and bath remodel | $100 – $250 |
Demolition is a better choice when:
- The foundation has structural problems.
- Ceilings are too low, sagging, or have large cracks.
- Severe mold or pest damages caused structural issues.
- Homes older than 50 to 70 years have multiple wiring and plumbing issues.
Can I demolish a house myself?
Tearing down a house yourself is not a DIY project. In many states, only licensed and bonded contractors can do demolition work like asbestos or lead removal, cutting utility lines, hauling debris, or using excavators.
Most contractors base their estimates on square footage; therefore, doing basic demolishing like removing appliances, tearing down drywall, or dismantling decks won't save much money.
Can you demolish a house with a mortgage on it?
The right to tear down mortgaged homes belongs to the lender. Some cities won't allow demolishing historical homes.
Banks may allow you to demolish a mortgaged home if:
- The land's value or planned rebuild is significantly higher than the home's value.
- The homeowner's high income qualifies for a refinanced construction loan.
- Owners originally bought the property with a "single-close" construction loan that becomes a mortgage loan upon building completion.
- The borrower didn't default on past mortgages.
- Homeowners have a credit score of 680 or higher.
- Buyers make a down payment of 20% to 30% for rebuilding.
How long does it take to demolish a house?
After getting permits and inspections, demolishing a house takes 2 to 5 days on average for leveling, cleaning, and hauling away debris. Difficult site accessibility, asbestos removal, and large concrete foundations require more time. Deconstruction adds 1 to 3 weeks.
Demolition steps | Average time frame |
---|---|
Inspections | 1 – 2 weeks |
Asbestos abatement | 1 – 2 weeks |
Rodent removal | 2 – 4 weeks |
Permit application | 2 – 8 weeks* |
Utility work | 1 – 4 weeks |
Demolition | 1 – 2 days |
Deconstruction | 1 – 3 weeks |
Foundation removal | 1 – 2 days |
Debris disposal | 1 – 2 days |
Site grading & backfilling foundation | 1 – 5 days |
Total time | 2.5 – 6.0 months |
*Major cities take 2 to 9+ months to process demolition permits for historical properties.
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How to find and hire a demolition contractor
- Collect at least three bids from different demolition professionals.
- Check customer reviews on HomeGuide and the Better Business Bureau (BBB).
- Select experienced companies with a demolition contractor license or a specialty C-21 certification in California.
- Select insured companies using modern power tools for greater demolition safety.
- Review the company's safety record on the Occupational Safety and Health Administration's website.
- Check the home's property survey to verify boundary lines before getting quotes.
- For partial demolitions, hire a contractor with experience in the specific type of remodeling needed.
- Get copies of the contract, detailed estimate, and warranty before work starts.
- Negotiate a fee schedule for partial payments at project milestones.
- Collect a lien waiver from contractors in exchange for issuing progress payments.
Questions to ask
- How many homes have you demolished in this area?
- Can you give several credit references, like suppliers or subcontractors you've worked with?
- Can I see your company's business license, insurance, and bond guarantees?
- Does your cost estimate include all labor, heavy equipment, permit, and inspection fees?
- Will you pull all the permits for this project?
- Will you cap the water and sewer lines?
- What other common incidental fees aren't in this quote?
- What are the construction waste disposal laws in my area, and how will you comply with those codes?
- How do you calculate the rebates from recycling salvage materials in this demolition?
- Do you allow non-profit deconstruction groups onsite to donate my building materials for a tax deduction?
- If you find asbestos, lead paint, or other hazardous materials, does your team have the certifications to dispose of them safely?
- Does your whole crew wear safety gear?
- What precautions do you take to contain dust and prevent damage to neighboring properties?
- How long will this demolition take, and what's the daily work schedule?
- What do you do when facing unexpected project delays?
- What type of warranty do you offer on your work?
- How should I contact the foreman or project manager?
- Do you have a daily clean-up protocol?
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- Paxton, Albert S. "2020 National Repair and Remodeling Estimator." (2020). PDF file.
- Hicks, Ray F. "2020 National Home Improvement Estimator." (2020). PDF file.
- Pray, Richard. "2020 National Construction Estimator." (2020). PDF file.
- Russell, Jonathan. "2020 National Painting Cost Estimator." 2020. PDF file.
- Thomson, James A. "2020 National Painting Cost Estimator." 2020. PDF file.
- Actual Project Costs Reported By 3,130 HomeGuide Members. (2021).
- Gollnick, Cory. Colorado Excavating. Personal communication. (2021).
- George, Bill. Demolition and Grading LLC. Personal communication. (2021).
- Barry, Eric. Colorado Demolition. Personal communication. (2021).
- Swope, Michael. Swope Exavation & Construction, LLC. Personal communication. (2021).
- McGehe, Jakob. Maverick Demolition. Personal communication. (2021).
- Holloway, Mike. Assertive Demolition. Personal communication. (2021).
- House demolition. (n.d.).
https://www.hometowndemolitioncontractors.com/demolition-cost/building-demolition/house-demolition - What can I expect to pay for a total house deconstruction? (2021).
https://www.coloradodemolition.com/deconstruction-pricing - Concrete foundation removal. (n.d.).
https://www.hometowndemolitioncontractors.com/demolition-cost/concrete-and-asphalt-removal/concrete-foundation-removal - Residential demolition permit. (2021).
https://www.houstonpermittingcenter.org/hpwcode1142 - Demolition cost per square foot - Phoenix. (2018).
https://www.joesbobcatdemolition.com/blog/home-demo-cost - Demolition cost. (n.d.).
https://demolitionconnection.com/demolition-cost/ - How to estimate the cost of a commercial demolition project. (2020).
https://pawdemo.com/how-to-estimate-the-cost-of-a-commercial-demolition-project/ - Cost to remove a concrete slab. (2021).
https://www.homewyse.com/services/cost_to_remove_concrete_slab.html - Shed removal service in Portland metro area. (2020).
https://www.ernieswagon.com/shed-removal/ - How much does shed removal cost? (2019).
https://firedawgsjunkremoval.com/how-much-does-shed-removal-cost/ - What does house demolition cost. (2019).
https://www.joesbobcatdemolition.com/blog/what-does-house-demolition-cost - Pre-demolition checklist. (2019).
https://www.greencircledemolition.com/learning-center/predemolition-checklist - How much does a demolition project cost? (rates & factors). (2019).
https://www.greencircledemolition.com/learning-center/demolition-cost - How to determine building demolition costs. (2019).
https://smallbusiness.chron.com/determine-building-demolition-costs-15447.html - The best way to demolish and remove a mobile home. (2021).
https://a-plus-enterprises.com/blog/how-to-demolish-a-mobile-home/ - Cost of demolition - house - barn - garage. (n.d.).
https://georgiahorsearenas.com/demolition-contractor - How much does it cost to demolish a house? (2019).
https://www.thestreet.com/personal-finance/real-estate/how-much-does-it-cost-to-demolish-a-house-15141992 - How much does it cost to knock down a wall? (2021).
https://homeguide.com/costs/cost-to-remove-a-wall - Memphis Light, Gas, and Water Division -- Memphis, TN. "Electric, gas, and water schedule of charges." (2017). PDF file.
https://www.mlgw.com/images/content/files/pdf/ScheduleofCharges.pdf - How much does it cost to remove a fireplace or chimney? (2020).
https://homeguide.com/costs/chimney-fireplace-removal-cost - How much does a building permit cost? (2021).
https://homeguide.com/costs/building-permit-cost - How much does it cost to build a house? (2021).
https://homeguide.com/costs/cost-to-build-a-house
How Much Does It Cost to Tear Down a Building
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