Restoring an Old Home in Denver: Costs and Permits

Start with three things before you swing a hammer: a lead and asbestos check, a wiring and plumbing inspection, and a call to the City and County of Denver's permit office (or your county's, if the home sits outside Denver proper). Homes built before 1978 carry known, fixable risks. Homes built before 1950 carry knob-and-tube wiring and galvanized or cast-iron plumbing on top of that. None of this means walk away. It means sequence the work correctly so you don't pay twice.

How do I know if my Denver home has lead paint?

Any Denver home built before 1978 is assumed to have lead-based paint somewhere under later coats, by federal rule. Baker, Capitol Hill, Five Points, Berkeley, Sunnyside, and Uptown are full of homes from that era. A certified inspector runs an XRF test on painted surfaces, inside and out, for $300 to $600 depending on house size. If the test comes back positive, a lead-paint-certified contractor handles any work that disturbs the paint — sanding, scraping, or demolition — under EPA RRP rules. Skip the certified contractor and you risk fines and a harder time disclosing the work later.

What is knob-and-tube wiring, and does my house still have it?

Knob-and-tube is the ceramic-knob wiring system used in most American homes built before 1940. It has no ground wire, and the rubber insulation on the original wire is now decades past its rated life. An electrician can confirm it in an hour by opening the panel and pulling an outlet cover or two. Many insurers in Colorado will not write or renew a homeowner's policy on a house with active knob-and-tube wiring, which makes this the renovation item to handle first, not last.

Does my older Denver home have asbestos?

Asbestos shows up in old homes in vermiculite attic insulation, floor tile and mastic, pipe wrap, and some siding shingles. It's stable and not a hazard until it's cut, sanded, or torn out. Before you touch attic insulation or pull up old flooring, order a sample test ($150 to $400 through a certified lab). If it comes back positive, hire an abatement contractor rather than a general remodeler; Colorado requires abatement work to run through a certified crew.

How much does it cost to rewire an older home in Denver?

A full rewire on a 1,500 to 2,200 square foot house runs $8,000 to $18,000 on the Front Range, depending on how much drywall has to come down to run new lines and whether the panel needs an upgrade to 200-amp service. Get three bids; older-home rewires vary more in price than almost any other renovation line item because access differs so much house to house.

Can I renovate a home inside a Denver historic district?

Yes, and most of what happens inside the walls is unrestricted. Denver Landmark Preservation reviews exterior changes visible from the street — windows, siding, additions, porches — in designated historic districts such as parts of Baker, Capitol Hill, and Five Points. Interior renovation, rewiring, replumbing, and kitchen or bath remodels do not need Landmark review. The Denver ADU, Zoning, and Historic District Guide breaks down which streets carry district status and what triggers a design review versus a standard permit.

Do I need a permit to replace windows in an old Denver home?

Yes, for a like-for-like window replacement Denver requires a building permit, and if the home is in a historic district, the replacement windows have to match the original style, material, and pane pattern as seen from the street. Pull the permit before the contractor orders windows; Denver's inspection process moves faster when the paperwork is in order from the start.

How does Denver's expansive clay soil affect an old foundation?

Front Range soil is heavy in bentonite clay, which swells when it gets wet and shrinks when it dries. A hundred years of that cycle moves old stone and brick foundations unevenly, which is why so many older Denver homes show step cracking in the mortar joints or a floor that's out of level by an inch or two over a long run. Keep gutters clean and grade the yard so water drains away from the foundation; that single habit prevents more foundation damage than any repair does.

What permits does Denver require for a kitchen or bathroom remodel?

Any remodel that touches plumbing, electrical, gas lines, or load-bearing walls needs a permit from Denver's Community Planning and Development office, and each trade (electrical, plumbing, mechanical) pulls its own. A cosmetic remodel — new cabinets, counters, paint, flooring with no layout change — does not need one. Confirm with the city before work starts; an unpermitted remodel becomes a disclosure problem when you sell.

Do I have to disclose old wiring or plumbing when I sell?

Colorado's seller's property disclosure asks directly about the age and condition of the electrical and plumbing systems, and about known defects. If you know the house has knob-and-tube wiring or cast-iron plumbing with a history of clogs or leaks, disclose it. Buyers find it anyway during inspection, and an early, honest disclosure keeps the inspection objection period from turning into a renegotiation.

How does hail season affect an old roof?

Colorado's hail season runs spring through September, and Front Range roofs take the brunt of it most years. An older roof with brittle, aged shingles shows hail damage — bruising and granule loss — more visibly than a newer roof, which matters both for insurance claims and for a buyer's inspection. If your roof is original to a home built before the 1990s, get it inspected before you list, not after an offer comes in.

What's the inspection objection deadline, and how does it affect an older home?

Colorado's standard contract sets a specific inspection objection deadline, negotiated in the contract, by which the buyer has to raise any repair requests in writing. On an older home, expect the objection list to include wiring, plumbing, foundation, and roof items found during inspection. Having your own pre-listing inspection done ahead of time means fewer surprises land inside that window, and fewer renegotiations after you're already under contract.

Is restoring an old home cheaper than buying new construction on the Front Range?

It depends entirely on the scope of work and the neighborhood. A light cosmetic update on a structurally sound old home is almost always cheaper per square foot than new construction. A full gut — rewire, replumb, foundation work, and a kitchen and bath remodel — can run $150 to $250 per square foot, which puts it close to or above new construction prices in some Front Range submarkets. Price the scope before you commit to either path.

Can I still renovate freely if my house sits in a historic district but isn't a landmark itself?

Most homes in a Denver historic district are "contributing structures," not individual landmarks, and the review standard for them is lighter than for a designated landmark building. Interior work stays unrestricted either way. Exterior street-facing changes go through a staff-level or design-review process that's faster for a contributing structure than for a landmark. Check your address on Denver's zoning map before you budget for the review timeline.

What Xcel Energy rebates help pay for old-home upgrades?

Xcel Energy runs rebate programs for insulation, high-efficiency furnaces, attic air sealing, and heat pump water heaters that apply to older Front Range homes just as frequently as new ones, since old homes have the most room for efficiency gains. Rebate amounts and programs change year to year, so check Xcel's current offers before you buy equipment; a rewire or insulation project is a logical time to fold in an efficiency upgrade while the walls are already open.

Should I get an inspection before I list an old home for sale?

Yes. A pre-listing inspection on a home over 50 years old costs $400 to $700 and gives you a repair list before a buyer's inspector finds the same items during the objection period. Fix what's cheap to fix, disclose what you don't fix, and price the home with the remaining items already accounted for. That approach holds up better than pricing high and hoping the inspection goes clean.

What's the difference between restoring and remodeling an old home?

Restoring keeps the home's original character — trim, hardware, window proportions, floor plan — while fixing what's failed structurally and mechanically. Remodeling changes the floor plan and finishes to a more current style. Most Front Range sellers land somewhere in between: keep the woodwork and window openings, replace the wiring, plumbing, roof, and mechanical systems, and update kitchens and baths for current buyers. Preparing and Adding Value Before Selling covers which upgrades return the most at closing on an older home.

How much does foundation repair cost on a 100-year-old Denver home?

Minor crack repair and mortar tuckpointing runs $500 to $3,000. Helical pier or push pier underpinning for a settling foundation runs $10,000 to $25,000 or more depending on how many piers the engineer specifies. Get a structural engineer's report before you hire a repair contractor; the report tells you whether you're looking at cosmetic cracking from normal clay-soil movement or an active settlement problem that needs engineered correction.

Paying for the work

A cash-out refinance or a renovation loan such as an FHA 203(k) can fold the purchase price and the rewire, plumbing, and roof work into one loan, which is the only way to make a full restoration pencil out for most buyers. Mike Oswald at Rate (NMLS 261003, Equal Housing Lender) walks Front Range buyers through renovation loan options at no cost to ask — and you are free to use any lender. Start at the Colorado Home Financing Guide or get mortgage-ready first with Kenna Credit Care.

Where to go next

• Denver ADU, Zoning, and Historic District Guide
• Preparing and Adding Value Before Selling
• Pricing Your Colorado Home to Sell
• Older Homes vs. New Construction: The Maintenance Reality for Denver Right-Sizers
• Foundation Red Flags to Consider When Buying a Home in Denver
• Explore Denver

Talk to the Kenna Real Estate Group

The Kenna Real Estate Group works with Front Range buyers and sellers on older homes every week — from a Baker bungalow that needs a full rewire to a Berkeley Craftsman ready to list as-is. We can walk a property with you, point out what a lender and an inspector will flag, and connect you with lead-certified and structural contractors we trust. Call or text 303-955-4220. A live person answers. Not a robot, not a phone tree. Ready to see what's on the market? Search every home for sale in Colorado.