Development Fees

​For building permit and inspection fees, please contact the Building Inspection division:
Building Inspections | 303-538-7250 | buildings@thorntonco.gov

For landscaping permit and fees, please read the Landscaping Permit Application form.

for water and sewer connection fees, please contact the Utility Billing office:
Utility Billing | 303-538-7370 | developmentfees@thorntonco.gov

Water Connection Fee Increase [PDF/572KB]

Development Fee Checklist

The following list of fees includes most fees that are associated with land development in the City of Thornton. The list is not a comprehensive list of all fees.

Fees include one initial and two subsequent staff reviews of the application and supporting documentation. Subject to the Director’s discretion, each additional review by staff shall be assessed additional review fees equal to twenty-five percent (25%) of the original application fee.

Planning & Zoning Fees

ItemAmount
Annexation$300
Amendments (PC)$290
Amendments (Administrative)$250
Appeals$90
Architectural review fee for residential units$100/lot
Cash-in-lieu payment for park, open space and trail acreage requirementsResidential: $1.50/square foot
Commercial: $3/square foot
Comprehensive Plan Amendment$350
Conceptual Site Plan$695
Development Permit (original approval)$580
Development Code Variance$115
Development Code Text Amendment$580
Inactivity Fee (applications that have not made a resubmittal within 180 days of the previous staff comment letter)100% of initial application fee
Metropolitan District Service Plan Application Fee$6,500 (potential additional fees)
Metropolitan District Material Modification of Service Plan Application Fee$4,000 (potential additional fees)
Minor Development Permit$100
Oil and Gas Permit$695.00 plus $15.00 per acre
Residential Development Allocation$75/lot
Specific Use Permit (also requires a Development Permit)$115
Subdivision Plat Application$230 plus $15/acre
Subdivision Plat Amendments$250
Temporary Use Permit$90
Vacation of ROW$250
Zoning Amendment$695
Zoning to Planned Development District$695 plus $15/acre
Zoning to Preservation/Revitalization District Plant$290
Zoning Verification Letter$45

Development Engineering Plan Review Fees

Subject to the Director's discretion, if the DA discussions extend longer than six months or more than twenty hours for original DA's and ten hours for DA amendments, additional charges may be required to complete the agreement. This will be assessed by an overall charge of $50/hour, in 30-minute increments, per city staff member involved.

Development Engineering Review Fees

ItemAmount
Developer's Agreement (DA)$1000 (potential additional fees)
Developer's Agreement (DA) Amendment$500 (potential additional fees)
Construction Documents after 3rd review (at Director’s discretion)$150/hour
Floodplain Development Permit$600
(Individual Single Family Lot: $150/lot)
Traffic Control Permit $50.00 plus the calculation per the traffic control permit application

Construction Permit Use Tax Calculations

Construction Permit Use Tax & Fees

ItemAmount
Construction Permit Fee1.5% of total contract cost ($30 minimum)
Sanitary Sewer Infrastructure TV Inspection Fee3% of sanitary sewer main cost
Franchise Permit Fee (If Applicable)$250
Materials Sales and Use Tax3.75% of 50% of total contract cost (not applied toward grading costs)

Performance Surety is required prior to the issuance of any construction permit in the City. Work within the existing City right-of-way requires a cash escrow or Letter of Credit.

City of Thornton construction permit use taxes are to be paid on the “Estimated Percentage Basis”, as prescribed by §26-391.(e)(1) of the Thornton Municipal Code.  A construction permit use tax deposit is required to be made based on a percentage of the total valuation of the construction contract.  The payment is due at the time a construction permit is issued, and is to be paid by the owner, lessee, or the general contractor. Subcontractors electing to do so may pay the permit use tax deposit separately at the time their permit is issued. The estimated taxable materials percentage is fifty percent (50%) of the total valuation of the construction contract. The following is an example of the permit use tax calculation:

Construction Permit Use Tax & Fees Example

ItemAmount
Total Valuation of Construction Contract$100,000.00
Estimated Taxable Percentage50%
Estimated Taxable Amount of Materials$50,000.00
City of Thornton Use Tax Rate3.75%
Construction Permit Use Tax Due: 
(At time construction permit is issued)
$1,875.00

Construction permit use tax is paid up front in lieu of City sales tax collected by vendors when materials are purchased. The construction permit must be presented to vendors when purchasing construction materials for the project to avoid paying the tax twice. The estimated permit use tax applies only to construction materials (property that becomes an inseparable part of a completed contract). Construction materials do not include equipment, tools or similar items.

Payment on the “Estimated Percentage Basis” does not typically satisfy taxes due on additions (change orders) to the original contract. Additional use taxes will be due when the value of actual taxable materials used on the project exceeds the 50% estimate. All taxes not paid on taxable materials or other taxable transactions for a construction project in Thornton are due in full thirty (30) days from the date of the Initial Acceptance. All related construction records are subject to audit after completion of a project to determine if additional tax is due – whether or not use tax was prepaid on a construction permit.

Application for refund may be made to the City within eighteen (18) months of the date of the Initial Acceptance when the total taxable materials are less than the fifty percent (50%) estimate.

City personnel are available to answer your questions by phone or in person at the Civic Center. Personal assistance is available 8:00 a.m. - 5:00 p.m. Monday through Friday. It is recommended that you call in advance to ensure a tax representative will be available for assistance. The phone number for the City Sales Tax Division is 303-538-7370.