Illinois · Construction-defect rights
Here is what you have, and here is how to keep it.
Illinois gives you four years from when you knew or should have known of the defect, and no more than ten years from the builder's act or omission (735 ILCS 5/13-214). Unusually, Illinois courts let a later buyer bring an implied warranty claim even though they never contracted with the builder.
What you have
The deadline does not protect a builder who concealed the problem.
In Illinois, a claim of fraud, concealment or serious misconduct is not cut off by the ordinary construction deadline (735 ILCS 5/13-214(e)).
THE DEADLINE DOES NOT PROTECT FRAUD. 735 ILCS 5/13-214(e) removes both the four-year and ten-year limits for fraudulent misrepresentation or concealment - if the builder hid it, the clock does not save them. Otherwise you have four years from discovering the defect, within a ten-year outer limit measured from the work itself.
The deadline
10 years to bring a construction-defect claim
735 ILCS 5/13-214(b)
10 years from THE ACT OR OMISSION in the design, planning, supervision, observation, management or construction of the improvement (735 ILCS 5/13-214(b)) — note the trigger is the act/omission, not substantial completion. Inside that outer limit runs a 4-year discovery period (subsection (a)): the claimant must sue within 4 years of knowing or having reason to know of the defect. FRAUD CARVE-OUT: subsection (e) provides that "the limitations of this Section shall not apply to causes of action arising out of fraudulent misrepresentations or to fraudulent concealment of causes of action" — a builder who fraudulently misrepresented or concealed the defect cannot invoke either the 4-year or the 10-year bar.
“No action based upon tort, contract or otherwise may be brought against any person for an act or omission of such person in the design, planning, supervision, observation or management of construction, or construction of an improvement to real property after 10 years have elapsed from the time of such act or omission.”
Before you sue: We have not yet confirmed whether Illinois requires written notice to the builder before a lawsuit. Some states do, and skipping it can get a case stayed or dismissed. Ask a Illinois attorney before filing.
What to do now
Write it down the day you notice it. Photograph it with something for scale. Note the date, the room, and what you saw. If it gets worse, photograph it again - a sequence is far stronger than one picture. Keep every message with the builder. You are not starting a fight; you are keeping the option open. Some states require written notice to the builder before you can sue. We have not confirmed whether Illinois does, so check with a licensed attorney before filing. A record made at the time is what most people are missing later.
The same defect, a different answer next door
The construction-defect deadline is a state-by-state accident of geography. The identical crack in the identical house can be dead in one state and live in another.