Sometimes, over one layer. The City's Express reroofing permit covers a recover over 1 existing layer, and adding a layer over 2 or more existing layers needs drawings from an Illinois architect or structural engineer. We cannot confirm whether the Code sets a hard cap on layers, so check with the Department of Buildings. Whether you should recover instead of tear off is a separate question about what is under the old shingles.
Can you roof over old shingles in Chicago? Yes, in some cases. A roof recover, where new roofing goes over one existing layer, is something the City's Express reroofing page names directly. But "allowed" and "a good idea" are two different questions, and both matter before you sign.
What does the City say about a second layer?
The City's Express Permit page for reroofing lists, as eligible work, a roof recover over 1 existing layer. If you want to add a layer over 2 or more existing layers, it requires drawings by an Illinois architect or structural engineer (City of Chicago). The same page sets the other terms: work done by a licensed Illinois roofing contractor, materials and methods that meet the Building Code, and no unpermitted rooftop feature such as a roof deck.
Here is what we can and cannot say. The City's page describes how the permit works for one layer versus two or more. We have not been able to confirm from the Code text whether Chicago sets an absolute maximum number of layers, so we do not state one (City of Chicago). If you have two layers already, or are not sure how many you have, ask the Department of Buildings what applies before you plan a third.
Does a permit apply to a pitched shingle roof?
Read the City's pages carefully, because they come at it from two directions. One lists pitched roofs of at least 2:12 as no-permit for repair, recover or replacement, and low-slope roofs as needing a permit (City of Chicago). Another describes the Express reroofing permit, which covers a recover over one layer (City of Chicago).
We would not assume either one without checking. Confirm with the Department of Buildings whether your specific job needs a permit. Our guide to the Chicago roof permit covers what we know on permits for roofing work.
Should you recover or tear off?
A recover is the less disruptive job. It skips the tear-off, which means less debris and a shorter job. That is its real advantage. Its real limits come from what it hides and what it adds:
- You cannot see the deck. Tearing off exposes the wood underneath. A recover leaves any rot, soft spots or old leaks covered. If the old roof was leaking, you are roofing over the evidence.
- It adds weight. A second layer is more load on the roof structure. We do not give weight figures here, and the City's drawings requirement for additional layers over two or more shows the point where it wants an engineer involved.
- The old problems stay. Curled or cupped shingles, bumps and ridges telegraph through the new layer.
- Flashings still need attention. Chimney, wall and vent flashing generally has to be dealt with either way.
On older bungalows and two-flats, the roofs that look like good candidates for a recover often have a second problem: a deck that was never fully dry after years of small leaks at a chimney or valley. A tear-off lets the roofer see and fix that. A recover buries it.
If the existing shingles lie flat and there are no leaks or soft spots, a recover is worth asking about. If you are not sure what the deck looks like, a tear-off is usually the safer path. Compare the options in shingle roof replacement on a Chicago bungalow.
What to ask your roofer
- How many layers are on the roof now, and how do you know?
- Is this a recover or a tear-off, and why?
- What will you do if you find damaged decking?
- Who pulls the permit, and will it be listed as a reroof?
- Is your Illinois roofing license current?
Illinois law requires a licensed roofing contractor for roofing work for hire (Illinois law). If you want the layer, insulation and permit rules for flat and low-slope roofs, see what Chicago requires when you re-roof.
Our roofing crew will count the layers, look at the deck and tell you straight whether a recover is worth it. The Chicago roofing guide covers the rest.
Common questions
The City's Express page covers a recover over one existing layer and requires architect or engineer drawings to add over two or more. We cannot confirm whether the Code sets a hard cap, so ask the Department of Buildings.
A tear-off lets the roofer inspect the deck and fix hidden damage. A recover is less disruptive but leaves rot, soft spots and old problems covered and adds weight. If the deck's condition is unknown, tearing off is generally the safer path.
The City's pages are not in perfect agreement. One lists pitched roofs as no-permit for recover, another describes an Express reroofing permit for a recover over one layer. Confirm with the Department of Buildings for your roof.
Sources
- City of Chicago: Express Permit Program: Reroofing
- City of Chicago: Guide to Building Permits: What Types of Work Do Not Require a Building Permit?
- Illinois General Assembly: Roofing Industry Licensing Act, 225 ILCS 335/9
Facts last checked: October 7, 2026.
This article explains general rules and common situations in Chicago. It is not legal advice, and City rules change. For a specific property, check with the Chicago Department of Buildings or a licensed professional.