Our Sill Repair Service in the A91 Area
How Long Does a Sill Repair Take?
If you’re arranging to have your sills repaired — either ahead of an NCT or after a structural fail — one of the most practical questions is how long you’ll be without your car. The honest answer is that it varies, and the range is meaningful: from a single day for straightforward work to two or three days for more extensive repairs.
Here’s what drives the timeline and what to expect at Quinn Engineering in Omeath.
The Variables That Affect Duration
Extent of the rot is the primary variable. A localised inner sill section with modest rot — say, a 40–50cm section of the inner box — is a defined job. The full run of both inner sills with significant rot throughout is a significantly larger scope.
One side or both sides — sill work on one side typically takes half the time of both sides, but not exactly half because the assessment, setup, and finishing steps overlap. Both sides typically take about 60–70% longer than one side, not double.
Inner sill only or inner and outer combined — if the outer cosmetic sill panel also needs replacement alongside the inner structural work, this adds to the timeline. The outer panel fitting comes after the structural weld work is complete.
Vehicle complexity — some vehicles have simpler sill construction and straightforward access. Others have more complex sections, integrated reinforcement members, or sill areas that require additional trim removal to access properly. We identify this at the assessment stage.
What else is found — sill rot frequently co-occurs with adjacent floor pan rot at the sill/floor junction. If this is identified in the inspection and agreed to be included in the work scope, it extends the timeline. We always flag this and discuss before extending the scope.
Typical Timelines by Scenario
Single side, localised inner sill section, straightforward vehicle: One full working day
Single side, full inner sill run, standard vehicle: One to one-and-a-half days
Both sides, inner sill structural repair, standard vehicle: Two days
Both sides, inner and outer sill, combined work: Two to two-and-a-half days
Both sides with associated floor junction work: Two to three days
These are typical figures. If the actual scope at first inspection is tighter or broader, the timeline adjusts. We’ll give you a specific estimate at the assessment stage before any work is committed.
How We Manage Your Time
When you book the vehicle in:
- We’ll confirm the timeline estimate based on the assessment
- We’ll let you know upfront if we think there’s a reasonable chance the scope will expand once the work is opened up (based on the vehicle’s age, condition, and what’s visible before stripping back)
- We’ll contact you during the job if we find anything that changes the estimate — before doing additional work, not after
If you’re working around the car for business or family reasons, tell us when you book. Where we can schedule the work to minimise inconvenience — starting on a Thursday to be ready Friday, for example — we’ll do our best to accommodate.
Timing Relative to an NCT Retest
If you’re having sills repaired for an NCT retest, there are a couple of things worth planning for:
Retest window — you have a defined period from your original fail date to get the retest done at the cheaper retest price. Check your NCT documentation for the specific window. We’ll confirm our estimated completion time so you can book the retest appropriately.
The repair is left visible — after the weld work is complete, we don’t apply underseal or paint over it before a retest. The NCT inspector needs to see the weld directly. This doesn’t add time, but it means the repair area will look raw until after the retest.
Retest booking — book the retest after you confirm the repair is complete, not before. There’s nothing worse than a retest booked for a car that’s still in the workshop.
Preparing for Your Appointment
A few practical notes that make the process smoother:
- Bring the NCT fail paperwork if the repair is retest-related — it tells us exactly what the inspector found and confirms the location
- Empty the boot if boot floor work is involved (it often is on older vehicles alongside sill work)
- Let us know about any previous sill work — if the sills have been repaired before, or if there’s any previous work in the area, mention it. Previous repairs sometimes complicate the cut-back stage.
Frequently Asked Questions
Q: Can a sill repair be done while I wait? A: In practice, no. A proper structural sill repair is at minimum a half-day job in the best case — and most jobs run to a full day or longer. It’s not a quick service job.
Q: Will I get a call if the timeline changes? A: Yes. If the work opens up more than expected, we’ll contact you before proceeding with anything outside the agreed scope. We won’t extend the job without discussion.
Q: Can I get the car back the same day if I drop it in early? A: For single-side localised work on a straightforward vehicle, a 7:30–8am drop with a same-day collection in the late afternoon is achievable. We’ll confirm this when you book based on our schedule and the specific vehicle.
Q: Is there any risk the car won’t be ready when expected? A: If the extent of rot is significantly larger than anticipated once the section is stripped back, the timeline may extend by a day. This is uncommon but possible, particularly on vehicles that haven’t had an underbody inspection before. We flag this risk at booking on vehicles where it’s more likely.
To book a sill repair in the A91 area — Dundalk, Omeath, Carlingford, or anywhere across Co. Louth — contact Quinn Engineering. We’ll give you a firm timeline at assessment and manage the work to get you back on the road as efficiently as possible. See our full sill repair service here.