THE ESTIMATING ANSWER
Estimate under-sink water filter installation by measuring the defined one kitchen sink cabinet, separating product allowances from labour and setting out the work sequence and exclusions. This fictional Coventry example uses 7 itemised lines totalling £1,120.00; its exact quantities and rates appear in the paired app PDF.
The worked job is one kitchen sink cabinet in Coventry. The written scope is: Install one selected under-sink drinking-water filter at an accessible existing sink cabinet with compatible supply and a separate dispensing tap if selected. 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 one selected under-sink drinking-water filter at an accessible existing sink cabinet with compatible supply and a separate dispensing tap if selected. Measure cabinet clearances, pipe arrangement, service access and tap-hole plan. 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 cabinet clearances, pipe arrangement, service access and tap-hole plan. 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 filter kit, tap and connector allowances; note future cartridge service is outside the quote. This example has 7 distinct lines, including cabinet and supply check, filter kit allowance, tap and connector allowance. Use actual supplier prices and labour inputs for a customer job; the displayed amounts are fictional document inputs.
Choose before pricing: Separate filter kit, tap and connector allowances; note future cartridge service is outside the quote. 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 supply isolation and cabinet space before drilling the worktop or fitting the unit. 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 supply isolation and cabinet space before drilling the worktop or fitting the unit. 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
A worktop that cannot accept the tap needs another product or scope. The example excludes whole-house treatment, water quality guarantee or worktop replacement. Record the discovery, agree the revised work and update the estimate before adding it to the job.
Change trigger: A worktop that cannot accept the tap needs another product or scope. 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, Cabinet and supply check is 1 lump sum × £108.00 = £108.00; Filter kit allowance is 1 each × £336.00 = £336.00. 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 |
|---|---|---|---|
| Cabinet and supply check | 1 lump sum | £108.00 | £108.00 |
| Filter kit allowance | 1 each | £336.00 | £336.00 |
| Tap and connector allowance | 1 set | £152.00 | £152.00 |
| Mount and pipe filter | 1 each | £240.00 | £240.00 |
| Worktop opening allowance | 1 lump sum | £116.00 | £116.00 |
| Flush and leak test | 1 lump sum | £108.00 | £108.00 |
| Clean-up and instructions | 1 lump sum | £60.00 | £60.00 |
| Illustrative total | £1,120.00 | ||
Adding the 7 exact line amounts gives £1,120.00. 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 one selected under-sink drinking-water filter at an accessible existing sink cabinet with compatible supply and a separate dispensing tap if selected.
Outside this example: No whole-house treatment, water quality guarantee or worktop replacement.
The role in this brief is plumbing 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 cabinet clearances, pipe arrangement, service access and tap-hole plan.
- Separate filter kit, tap and connector allowances; note future cartridge service is outside the quote.
- Confirm supply isolation and cabinet space before drilling the worktop or fitting the unit.
- A worktop that cannot accept the tap needs another product or scope.
Compare the written scope with every line in the under-sink water filter 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 under-sink water filter installation estimate?
Measure cabinet clearances, pipe arrangement, service access and tap-hole plan.
When should this under-sink water filter installation quote be revised?
A worktop that cannot accept the tap needs another product or scope. No whole-house treatment, water quality guarantee or worktop replacement.
FROM SITE NOTES TO AN ITEMISED PDF
Build your own under-sink water filter 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.
