THE ESTIMATING ANSWER
Estimate patio drainage channel installation by measuring the defined one paved patio edge, separating product allowances from labour and setting out the work sequence and exclusions. This fictional Exeter example uses 7 itemised lines totalling £3,562.26; its exact quantities and rates appear in the paired app PDF.
The worked job is one paved patio edge in Exeter. The written scope is: Install a surface drainage channel along an existing paved patio edge and connect to a confirmed suitable outlet. 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.
1. Define the measured job
Install a surface drainage channel along an existing paved patio edge and connect to a confirmed suitable outlet. Measure channel run, paving cut length, invert level and available outlet route. 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 channel run, paving cut length, invert level and available outlet route. 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
Keep channel units, grates and pipe fittings distinct from excavation and reinstatement. This example has 7 distinct lines, including levels and outlet survey, paving cut and lift, trench excavation. Use actual supplier prices and labour inputs for a customer job; the displayed amounts are fictional document inputs.
Choose before pricing: Keep channel units, grates and pipe fittings distinct from excavation and reinstatement. 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
Confirm outlet permissions and levels before cutting paving. 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: Confirm outlet permissions and levels before cutting paving. 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
No workable outlet or insufficient fall requires redesign rather than an assumed connection. The example excludes new soakaway, sewer repair or large-area repaving. Record the discovery, agree the revised work and update the estimate before adding it to the job.
Change trigger: No workable outlet or insufficient fall requires redesign rather than an assumed connection. 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, Paving cut and lift is 13.7 metres × £36.70 = £502.79; Trench excavation is 13.7 metres × £26.20 = £358.94. 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 |
|---|---|---|---|
| Levels and outlet survey | 1 lump sum | £152.00 | £152.00 |
| Paving cut and lift | 13.7 metres | £36.70 | £502.79 |
| Trench excavation | 13.7 metres | £26.20 | £358.94 |
| Channel and grate allowance | 13.7 metres | £99.70 | £1,365.89 |
| Drain connection parts | 1 lump sum | £224.00 | £224.00 |
| Channel setting labour | 13.7 metres | £47.20 | £646.64 |
| Paving reinstatement and clean | 1 lump sum | £312.00 | £312.00 |
| Illustrative total | £3,562.26 | ||
Adding the 7 exact line amounts gives £3,562.26. 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
Install a surface drainage channel along an existing paved patio edge and connect to a confirmed suitable outlet.
Outside this example: No new soakaway, sewer repair or large-area repaving.
The role in this brief is general 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 channel run, paving cut length, invert level and available outlet route.
- Keep channel units, grates and pipe fittings distinct from excavation and reinstatement.
- Confirm outlet permissions and levels before cutting paving.
- No workable outlet or insufficient fall requires redesign rather than an assumed connection.
Compare the written scope with every line in the patio drainage channel installation 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 patio drainage channel installation estimate?
Measure channel run, paving cut length, invert level and available outlet route.
When should this patio drainage channel installation quote be revised?
No workable outlet or insufficient fall requires redesign rather than an assumed connection. No new soakaway, sewer repair or large-area repaving.
FROM SITE NOTES TO AN ITEMISED PDF
Build your own patio drainage channel installation 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.
