THE ESTIMATING ANSWER
Estimate accessible ventilation duct repair by measuring the defined one damaged duct run, separating product allowances from labour and setting out the work sequence and exclusions. This fictional Coventry example uses 7 itemised lines totalling £2,384.24; its exact quantities and rates appear in the paired app PDF.
The worked job is one damaged duct run in Coventry. The written scope is: Repair an identified accessible ventilation duct section and reinstate insulation and supports without redesigning the full system. Its matching itemised example shows how that description becomes quantities, allowances and a PDF. These figures are fictional inputs for learning the method, so check the real site, specification and supplier or subcontractor costs before quoting.
Duct repair estimating: define the damaged section first
A duct repair quote should identify the defect and the section affected rather than treat the entire system as damaged. Record whether the issue concerns a disconnected joint, crushed flexible duct, damaged rigid duct, insulation or a support. Give the specialist photographs of accessible sections and explain the symptom, while leaving diagnosis and the repair method to their inspection.
Measure the proposed replacement length in linear m, record duct dimensions separately and count transitions, joints and supports. Keep insulation reinstatement, ceiling access and making good distinct from the duct repair itself. Two repairs of equal length can need different labour allowances if one is in an open service area and the other requires reaching a confined roof space.
Ask each supplier to price the same identified section and explain whether the rest of the system was inspected. State what performance check is included after repair. A local repair allowance should not imply a full redesign, whole-system cleaning or replacement of every duct run; quote those separately if recommended.
A separate worked planning example
Illustrative quantity: one 3.6 m damaged run, two connecting joints and three supports. Enter the specified duct and insulation quantities separately, then add access and the agreed performance check. No airflow target is inferred from this length.
Cost and scope questions
Is duct repair priced by length or by the visit?
It can include both: a visit or access charge plus measured replacement duct, fittings and repair labour. Ask the quote to distinguish investigation from the confirmed repair.
Does a repaired duct mean the whole system has been balanced?
Only if the quote includes that wider service. An operational check on the repaired section is a different scope from a whole-system airflow assessment.
1. Define the measured job
Repair an identified accessible ventilation duct section and reinstate insulation and supports without redesigning the full system. Measure damaged run, duct size, joint count and access height. Record the measurements and existing condition in the estimate before turning quantities into line items. The scope should make clear why this is a separate project from a broader renovation or maintenance quote.
Measure for this job: Measure damaged run, duct size, joint count and access height. Record the measured basis next to the relevant cost lines, since a room count, fitted length and purchased product quantity may each use a different unit.
2. Build a product and labour schedule
Separate replacement duct, sealant and insulation allowances. This example has 7 distinct lines, including duct inspection and access, damaged duct removal, replacement duct allowance. Use actual supplier prices and labour inputs for a customer job; the displayed amounts are fictional document inputs.
Choose before pricing: Separate replacement duct, sealant and insulation allowances. Keep a named allowance when the selection is open, and replace it once the actual product and delivery terms are known.
3. Sequence the work and handoffs
Inspect adjacent joints before cutting and verify airflow after repair. Show which task depends on access, a selected product or another trade. If that dependency is still open, label the price preliminary and identify the information needed before a firm quote.
Plan the handoffs: Inspect adjacent joints before cutting and verify airflow after repair. State which stage needs access or inspection before the next can begin, especially if a concealed condition might stop the work.
4. Set a change boundary
Further inaccessible damage requires investigation beyond this local repair. The example excludes air handling unit replacement, full duct cleaning or concealed ceiling restoration. Record the discovery, agree the revised work and update the estimate before adding it to the job.
Change trigger: Further inaccessible damage requires investigation beyond this local repair. If this happens, write down the revised quantity and responsibility before adding an item to the customer estimate.
Worked project calculation
The paired PDF has 7 cost lines. For example, Damaged duct removal is 9.8 metres × £31.50 = £308.70; Replacement duct allowance is 11 metres × £62.99 = £692.89. Each amount is the stated quantity multiplied by its unit rate. Recheck whether a line describes installed work, a material purchase allowance or a distinct visit before changing its quantity.
| Work item | Quantity | Unit rate | Amount |
|---|---|---|---|
| Duct inspection and access | 1 lump sum | £148.00 | £148.00 |
| Damaged duct removal | 9.8 metres | £31.50 | £308.70 |
| Replacement duct allowance | 11 metres | £62.99 | £692.89 |
| Joint and hanger allowance | 1 lump sum | £192.00 | £192.00 |
| Duct fitting labour | 9.8 metres | £57.75 | £565.95 |
| Insulation reinstatement | 9.8 metres | £31.50 | £308.70 |
| Airflow check and clean-up | 1 lump sum | £168.00 | £168.00 |
| Illustrative total | £2,384.24 | ||
Adding the 7 exact line amounts gives £2,384.24. The PDF uses a 0% tax input and no markup solely to display this arithmetic. Decide the appropriate tax, overhead and profit treatment for an actual job; the fictional rates are not local averages or price recommendations.
Scope and price boundaries
Repair an identified accessible ventilation duct section and reinstate insulation and supports without redesigning the full system.
Outside this example: No air handling unit replacement, full duct cleaning or concealed ceiling restoration.
The role in this brief is mechanical contractor. Confirm who supplies the selected products, makes the site safe, removes waste and signs off the work. Where opening up reveals a different condition, document it and issue a revised scope and price rather than silently extending the base estimate. Also check access, drying or curing time, and the client handoff described in the work sequence.
Before you send
- Measure damaged run, duct size, joint count and access height.
- Separate replacement duct, sealant and insulation allowances.
- Inspect adjacent joints before cutting and verify airflow after repair.
- Further inaccessible damage requires investigation beyond this local repair.
Compare the written scope with every line in the accessible ventilation duct repair PDF example. The preview below is the first page of the actual app export; open the PDF to inspect its full scope, notes and amounts.
Questions about this job
Which quantity controls this accessible ventilation duct repair estimate?
Measure damaged run, duct size, joint count and access height.
When should this accessible ventilation duct repair quote be revised?
Further inaccessible damage requires investigation beyond this local repair. No air handling unit replacement, full duct cleaning or concealed ceiling restoration.
FROM SITE NOTES TO AN ITEMISED PDF
Build your own accessible ventilation duct repair estimate
Enter the project boundary and your measured lines in Estimates on iPhone or Android. Edit the fictional quantities and rates, add the actual business and client details, then inspect the PDF before sharing it.
