How Much Does Sill Welding Cost in the UK?
Last updated: 7 September 2026 — UK pricing ranges and current DVSA/HSE guidance were rechecked for this update.
In the UK, a small car-welding patch may cost about £125–£200, while a sill repair on one side commonly falls around £200–£500. A full sill-panel replacement can cost roughly £300–£600+ before extensive hidden corrosion, inner-sill work, paint, or other structural repairs are added. Major structural welding can reach £1,000 or more.
There is no dependable flat “£350 per side” price for every sill. The final bill depends mainly on how far the corrosion extends once weak metal is cut back, whether the inner structure is affected, access, repair-panel availability, and how much refinishing is required.
| Repair Type | Typical UK Planning Range | What Can Change the Price |
|---|---|---|
| Small hole or rust patch | About £125–£200 | Access, rust beyond the visible hole, preparation |
| Sill repair on one side | About £200–£500 | Repair size, inner-sill condition, fabrication |
| Full sill-panel replacement | About £300–£600+ | Panel cost, hidden corrosion, paint and finishing |
| Extensive structural welding | Can reach £1,000+ | Multiple structural areas, difficult access, major fabrication |
These are budgeting ranges rather than fixed national tariffs. Current UK references include MyBuilder’s welding cost guide and Bumper’s car sill repair guide. An in-person inspection is still the best way to price structural rust because corrosion often extends farther than the area visible from outside.
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Understanding Sill Welding
Car sills run below the door openings. Depending on the vehicle’s construction, they can form part of an important load-bearing area. Corrosion therefore needs more than a cosmetic patch when it has reduced the strength of the structure.
The DVSA MOT inspection manual says structural repairs must be properly carried out, use suitable materials, and extend to sound parts of the load-bearing structure. The importance of a sill can vary with the design of the vehicle, so the correct repair should follow the vehicle’s construction and any relevant manufacturer procedure.
Welding also creates fume, heat, sparks and fire risks. The Health and Safety Executive advises controlling welding fumes with suitable extraction or respiratory protection and taking appropriate hot-work precautions. On vehicles, nearby trim, fuel-system parts and other combustible materials also need to be considered before welding starts.
Factors Influencing Sill Welding Costs
The biggest cost factor is usually the amount of sound metal left after corrosion is exposed. A small visible blister can turn into a larger job if the outer sill is removed and rust is found in the inner sill, floor edge, jacking area or reinforcement behind it.
Access also changes the labour bill. The shop may need to remove trim, protective coatings or damaged metal before it can fabricate or fit a repair section. A readily available replacement panel can reduce fabrication time, while an unusual shape may need to be made by hand.
Paint and corrosion protection matter too. Ask whether the quote includes grinding and finishing, primer, seam sealing, cavity protection, exterior paint, VAT and any MOT retest. A low welding-only quote can become much more expensive when these items are added later.
The welding or joining method should be chosen for the repair and vehicle construction, not simply because one process is cheaper. For MOT structural repairs, the finished repair must meet the applicable DVSA requirements and restore adequate strength.
What Does Inner and Outer Sill Replacement Cost?
There is no reliable national flat rate for an inner sill versus an outer sill. Current UK consumer guides normally price sill work by repair size, side or complete panel replacement because the labour changes dramatically once the vehicle is opened up.
If only a localised outer area is affected and sound metal remains around it, the repair may stay near the lower end of the range. If corrosion has reached the inner reinforcement or adjoining structure, expect more cutting, fabrication and welding. Both sides with extensive inner corrosion can therefore cost much more than a simple two-times-per-side calculation suggests.
Cost Breakdown Overview
Use these figures for early budgeting, then compare them with an inspected written quote:
| Cost Component | Planning Range or Status |
|---|---|
| Small rust or hole patch | About £125–£200 |
| Sill repair on one side | About £200–£500 |
| Full sill-panel replacement | About £300–£600+ |
| Extensive structural welding | Can reach £1,000+ |
| Inner-sill or hidden structural corrosion | Inspection required; can materially increase the quote |
| Paint and refinishing | Check whether included |
Do not choose a repairer from the headline price alone. Two quotes can describe very different jobs if one includes cutting back to sound steel, finishing and corrosion protection while another covers only basic welding.
What Should a Sill Welding Quote Include?
A useful written quote should make the repair scope clear. Ask whether it includes:
- inspection and access to the damaged area;
- removal of corroded metal back to sound material;
- a supplied repair panel or fabricated replacement steel;
- repair of any affected inner structure;
- welding, grinding and finishing;
- seam sealing, primer and corrosion protection where required;
- paint or exterior refinishing;
- replacement of removed trim or fittings;
- VAT; and
- any MOT retest or post-repair inspection.
Also ask what happens if additional corrosion appears after cutting starts. Agreeing how supplementary work will be authorised can prevent a surprise final bill.
Professional vs. DIY Sill Welding
Structural sill welding is not a good place to learn by trial and error. The job combines thin body steel, corrosion, hidden combustible materials, welding fumes and MOT structural requirements.
| Aspect | Professional Sill Welding | DIY Sill Welding |
|---|---|---|
| Cost | Higher labour cost, but inspection, fabrication and finishing can be included | Equipment may reduce labour spend only if you already have the required skills and setup |
| Structural assessment | Experienced repairer can assess inner and surrounding metal | Easy to underestimate corrosion hidden behind the outer panel |
| MOT requirements | Repair can be planned around DVSA and vehicle-specific requirements | An incorrect repair method or poor weld can remain unacceptable |
| Safety | Workshop can provide extraction, fire controls and suitable vehicle access | Fume, fire, electrical and vehicle-support risks require proper controls |
| Best use | Structural, MOT-related and extensive corrosion repairs | Practice or non-structural fabrication only when the person is competent |
HSE guidance states that welding fume requires effective controls. Vehicle welding also creates specific hot-work risks around trim, fuel systems and body cavities. For structural or MOT-related sill corrosion, using an experienced automotive welder or body-repair specialist is the safer choice.
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Importance of Structural Integrity in Sill Repairs
A sill repair must restore the strength required by that vehicle’s structure. DVSA notes that corrosion in a relatively small but important load-bearing area can make a vehicle unsafe, while corrosion in a non-structural area may have a different effect.
The repair therefore needs to extend into sound material. Simply covering weak metal, filling a hole or attaching a cosmetic skin does not address structural corrosion.
Role of Sills
Sills run along the lower sides of the passenger compartment and can contribute to the body’s stiffness and load paths. Their exact structural role varies by vehicle construction. They may also sit near jacking, seat-belt, floor or suspension-related areas that require careful inspection when corrosion spreads.
That is why the complete affected area matters more than the visible size of the hole. Before approving welding, ask the repairer whether the inner sill and adjoining floor or reinforcement have been inspected.
What Welding Methods Are Acceptable for an MOT Repair?
There is no rule that every sill repair must use exactly the same weld pattern. The DVSA requirement depends on the type of repair.
- Patch repairs: In circumstances not covered by an acceptable original-style replacement method, structural patch repairs must normally be continuously seam welded.
- Replacement sections: Spot-welded repairs can be acceptable where the original panel was spot welded and the original panel or section has been removed. Stitch or plug welding can also be acceptable in that situation.
- Manufacturer repair methods: DVSA guidance recognises that some manufacturers specify methods such as MIG brazing or combinations involving riveting or bonding. The vehicle-specific procedure should therefore be checked when relevant.
- Sound base metal: Whatever method is used, welding or plating must extend to sound parts of the load-bearing structure.
For the exact MOT standard, see the DVSA structural integrity and corrosion guidance.
Long-term Repair Considerations
A cheap patch is poor value if it leaves badly corroded metal beside or behind the repair. Ask the shop how far the affected metal will be removed and how it will inspect the inner structure before welding.
After the structural work, the repaired area also needs suitable finishing and corrosion protection for the vehicle and repair method. Ask what primer, seam sealing, exterior coating, paint and cavity protection are included rather than assuming they form part of a welding-only price.
Is Sill Welding Worth It?
Sill welding can make economic sense when the corrosion is localised and the rest of the vehicle is in good condition. It becomes a harder decision when both sides, inner structure, floor sections or other load-bearing areas need substantial work.
Compare the complete repair bill with the condition and realistic replacement value of the car. Include other near-term MOT or mechanical work in the calculation. There is no universal percentage at which a car should automatically be repaired or scrapped.
Before deciding, get the car inspected on a ramp and ask for a written scope. A quote based only on an exterior photograph may change once trim, coatings or the outer sill are removed.
What Current UK Repair Guides Agree On
Current UK pricing sources differ on exact figures, but they agree on the main reason sill-welding bills vary: repair extent matters far more than the visible length of the weld.
- Small repairs cost far less than major reconstruction: Current guides place small patches in the low hundreds, while substantial structural work can reach £1,000 or more.
- One fixed per-side figure is unreliable: Inner corrosion, access and panel replacement can move the job outside a simple “price per sill” estimate.
- Inspection matters: A useful quote should state what is being removed, repaired, replaced, protected and refinished.
For wider repair-cost context, see our guide to UK car welding costs. This page stays focused specifically on sill corrosion, sill replacement and MOT-related structural repair.
Frequently Asked Questions
How Long Does Sill Welding Take?
A small accessible patch may be completed the same day, while a full sill replacement can take considerably longer. Cutting out corrosion, fabricating or fitting metal, welding, finishing, corrosion protection and paint all add time. Ask the shop for both the labour scope and expected vehicle turnaround.
Can I Drive a Car After an MOT Failure for Sill Corrosion?
It depends on the MOT status and defect category. GOV.UK says you can take a failed vehicle away if its existing MOT is still valid and no dangerous problem was listed, but the vehicle must still meet minimum roadworthiness standards. If a dangerous defect is recorded, do not drive it until the defect is repaired.
If the MOT has expired, separate limited exceptions can allow travel to or from somewhere for repair or to a pre-arranged MOT test, but the vehicle must still be roadworthy. Check the current GOV.UK MOT test-result guidance before moving the vehicle.
Does Sill Welding Have to Be Continuously Seam Welded?
Ordinary structural patch repairs generally need continuous seam welding under DVSA MOT guidance. However, replacement of an original spot-welded panel can use acceptable spot, stitch or plug-welding arrangements, and some manufacturer-approved repair procedures use other joining methods. The correct method depends on the vehicle and the type of repair.
Can a Rusty Sill Pass an MOT?
Surface corrosion does not automatically mean an MOT failure. The important question is whether corrosion has seriously reduced the strength or continuity of an important structural area. If a repair is required, it must restore adequate strength and meet the applicable MOT repair standard.
How Can I Prevent Future Sill Rust?
Inspect the sill edges, drain areas and protective coatings regularly. Deal with damaged paint or coatings before corrosion spreads, keep drainage paths clear where the vehicle design provides them, and ask a competent repairer about suitable cavity and underbody corrosion protection for your vehicle. After welding, confirm what protection has been restored inside as well as outside the repaired section.
Conclusion
For a realistic UK sill-welding budget, think in repair types rather than a fixed price per side. A small patch can stay in the low hundreds, a one-side sill repair is commonly around £200–£500, and full panel or extensive structural work can cost much more.
The most useful next step is an inspection on a ramp followed by a written, itemised quote. Check whether it covers hidden inner-sill corrosion, panel or patch fabrication, welding, finishing, corrosion protection, paint, VAT and any MOT retest. That gives you a much better basis for deciding whether to repair the car than a headline welding price alone.
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