THE ESTIMATING ANSWER
Estimate garden land drain installation by measuring the defined one wet garden run, separating product allowances from labour and setting out the work sequence and exclusions. This fictional Brighton example uses 7 itemised lines totalling £3,724.69; its exact quantities and rates appear in the paired app PDF.
The worked job is one wet garden run in Brighton. The written scope is: Install a shallow subsurface drain across an accessible garden run and connect it to a confirmed lawful discharge point. 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 shallow subsurface drain across an accessible garden run and connect it to a confirmed lawful discharge point. Record run length, trench depth, fall, soil conditions and discharge location. 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: Record run length, trench depth, fall, soil conditions and discharge location. 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 perforated pipe, aggregate and geotextile quantities from digging and reinstatement. This example has 7 distinct lines, including drain route survey, service check and protection, trench excavation. Use actual supplier prices and labour inputs for a customer job; the displayed amounts are fictional document inputs.
Choose before pricing: Separate perforated pipe, aggregate and geotextile quantities from digging 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
Trace buried services and confirm discharge before excavation. 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: Trace buried services and confirm discharge before excavation. 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
Unexpected utilities or no feasible outlet can stop the base design. The example excludes basement waterproofing, drainage approval or major landscape reconstruction. Record the discovery, agree the revised work and update the estimate before adding it to the job.
Change trigger: Unexpected utilities or no feasible outlet can stop the base design. 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, Trench excavation is 27.4 metres × £39.35 = £1,078.19; Perforated pipe allowance is 27.4 metres × £21.00 = £575.40. 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 |
|---|---|---|---|
| Drain route survey | 1 lump sum | £168.00 | £168.00 |
| Service check and protection | 1 lump sum | £128.00 | £128.00 |
| Trench excavation | 27.4 metres | £39.35 | £1,078.19 |
| Perforated pipe allowance | 27.4 metres | £21.00 | £575.40 |
| Stone and fabric allowance | 1 lump sum | £496.00 | £496.00 |
| Pipe bedding and connection | 27.4 metres | £31.50 | £863.10 |
| Backfill and turf reinstatement | 1 lump sum | £416.00 | £416.00 |
| Illustrative total | £3,724.69 | ||
Adding the 7 exact line amounts gives £3,724.69. 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 shallow subsurface drain across an accessible garden run and connect it to a confirmed lawful discharge point.
Outside this example: No basement waterproofing, drainage approval or major landscape reconstruction.
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
- Record run length, trench depth, fall, soil conditions and discharge location.
- Separate perforated pipe, aggregate and geotextile quantities from digging and reinstatement.
- Trace buried services and confirm discharge before excavation.
- Unexpected utilities or no feasible outlet can stop the base design.
Compare the written scope with every line in the garden land drain 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 garden land drain installation estimate?
Record run length, trench depth, fall, soil conditions and discharge location.
When should this garden land drain installation quote be revised?
Unexpected utilities or no feasible outlet can stop the base design. No basement waterproofing, drainage approval or major landscape reconstruction.
FROM SITE NOTES TO AN ITEMISED PDF
Build your own garden land drain 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.
