Three things decide whether to repair a roof or replace it: how old it is, how much of it is damaged, and whether the replacement shingles will match. Everything else is detail.
If the roof is under fifteen, the damage sits on one slope, and the colour is still made, repair it. If two of those three are against you, get replacement priced before you spend anything on a patch.
Age is the first question because it caps everything else
An asphalt shingle roof in the Chicago climate has a working life of roughly twenty to twenty-five years. Architectural shingles reach the upper end of that, three-tab the lower.
The number that matters is not the age itself but what is left. Spending two thousand dollars patching a roof with three years remaining is money you will spend again very soon. The same two thousand on a roof with twelve years left is straightforwardly worth it.
If you do not know the age, a few things narrow it down. Check whether the previous owner left paperwork. Look for a permit record with the village. Failing both, an inspector can usually estimate from granule loss, the state of the seals, and how brittle the shingles have become.
How much of the roof is affected
Storm damage is usually directional. The wind came from one side, so one or two elevations take it and the others are untouched. That is normal and it is a good sign for repair.
Damage spread across several slopes is a different situation. Once you are replacing shingles on three sides of a house, the labour of setting up, tearing off and disposing has been paid three times over, and the price gap between patching and doing the whole thing narrows sharply.
There is also a structural version of this question. If the roof deck underneath has soft spots, or has already carried two layers of shingles, patching the surface leaves the real problem in place.
The match problem
Shingle colours are discontinued regularly. Manufacturers change ranges, and a colour from twelve years ago may simply not exist now.
This matters more than people expect. A repaired patch in a near-match reads as a repaired patch from the street, and it stays visible for the rest of the roof’s life. When you sell, a buyer’s inspector will note it and a buyer will wonder what happened.
If the colour is gone, you are choosing between a visible patch and a whole roof. That is worth knowing before you start rather than after.
What it costs and what you get back
Here is the part most roofing companies are vague about.
The 2025 Cost vs. Value Report from Zonda Media puts a national average asphalt shingle roof replacement at $31,871, adding $21,501 to resale value. That is 68% recouped. In the Midwest the figure runs lower, roughly 60 to 65 per cent.
Read that plainly. A new roof does not pay for itself. On average you get back about two-thirds of what you spend, which means a roof is a cost you recover most of, not an investment that returns a profit.
So why do it before selling? Because a failing roof does not cost you 32 per cent, it costs you the sale. Buyers and their lenders treat a roof at the end of its life as a problem to be priced in, and the deduction they ask for is rarely as reasonable as the actual quote. A visible tarp or a stained ceiling turns into a negotiation you will lose.
The honest advice is this. If you are selling soon and the roof is sound, do not replace it for resale value alone. If the roof is failing, replace it or expect to discount for it.
Recoup also varies enormously by state. The same 2025 report shows a range from 86.5 per cent in Utah down to 21.6 per cent in Nebraska, so national averages are a guide and nothing more.
What actually happens during a replacement
Most homeowners have never had one done and reasonably want to know what a few days looks like.
A skip or dump trailer arrives, usually the day before or the morning of. Materials are delivered and stacked, often on the roof itself or in the driveway. You will be told where, so you can move cars.
Tear-off is the loud part. The old shingles come off down to the deck, and this is when any rotten decking is found and replaced. A quote should say the price per sheet for that in advance, because it is the one cost nobody can predict from the ground.
Then underlayment, ice and water barrier at the eaves and valleys, flashing, new shingles, and ridge caps. A magnet is run over the lawn and driveway for nails at the end, which matters more if you have children or bare feet in summer.
Most single-family replacements take one to three days. Weather adds days. A steep or complex roof adds days.
The permit and the village inspection sit around this. In most Chicagoland villages a full replacement needs a permit and a post-installation inspection, and the requirements differ from one village to the next. Your contractor should be handling that rather than leaving it with you.
When to have it done
Spring and autumn are the comfortable seasons and therefore the busy ones. Booking is longer and prices are firmer.
Winter installation is possible and it is done routinely here, with one caveat worth understanding. Asphalt shingles self-seal using warmth from the sun. In cold weather that can take weeks, and a roof installed in December may not fully bond until spring. Good crews hand-seal the exposed courses for exactly this reason. Ask whether yours will.
The wrong time to replace a roof is after it has started leaking into the house, because by then you are also paying for ceilings, insulation and sometimes flooring.
Questions worth asking before you sign
- What is the price per sheet if the decking needs replacing?
- Is the quote four-nail or six-nail?
- Does it include a proper starter strip at eaves and rakes?
- Manufacturer’s matched ridge cap or cut shingles?
- Who pulls the permit and books the inspection?
- What is the workmanship warranty, and separately, what is the manufacturer’s?
- Can I see your Illinois state licence number and proof of insurance?
Those seven make quotes comparable, which is otherwise hard when each is laid out differently.
Get an assessment before you decide
Proliance inspects roofs across the Chicago metro at no cost and provides a written report saying what is damaged, how much of the roof is affected, and whether repair or replacement makes sense. Our inspectors are HAAG certified. We are based in Westmont and have been trading for 21 years. Call 800-613-4373.
