THE ESTIMATING ANSWER
Estimate bath to shower conversion by measuring the defined one existing bath alcove, separating product allowances from labour and setting out the work sequence and exclusions. This fictional Manchester example uses 7 itemised lines totalling £4,543.69; its exact quantities and rates appear in the paired app PDF.
The worked job is one existing bath alcove in Manchester. The written scope is: Remove one bath and fit a shower in the same alcove, with a new base, wall finish, valve trim and screen allowance. Existing supply and drain positions remain. 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
Remove one bath and fit a shower in the same alcove, with a new base, wall finish, valve trim and screen allowance. Existing supply and drain positions remain. Measure the finished alcove on three sides, the wet-wall area and the drain location before selecting the base. 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 the finished alcove on three sides, the wet-wall area and the drain location before selecting the base. 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 the shower tray, screen and finish tile as named allowances until the products are selected. This example has 7 distinct lines, including dust protection, bath and surround removal, shower tray allowance. Use actual supplier prices and labour inputs for a customer job; the displayed amounts are fictional document inputs.
Choose before pricing: Keep the shower tray, screen and finish tile as named allowances until the products are selected. 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 water shutoff, demolition, waterproofing inspection and curing time before promising a handoff date. 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 water shutoff, demolition, waterproofing inspection and curing time before promising a handoff date. 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
Rot behind the surround or a drain that cannot align with the chosen base changes the work. The example excludes bathroom layout change, concealed structural repair or whole-room repainting. Record the discovery, agree the revised work and update the estimate before adding it to the job.
Change trigger: Rot behind the surround or a drain that cannot align with the chosen base changes the work. 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, Wet-wall preparation and waterproofing is 7 sq m × £155.00 = £1,085.00; Wall finish installation is 7 sq m × £206.67 = £1,446.69. 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 |
|---|---|---|---|
| Dust protection | 1 lump sum | £132.00 | £132.00 |
| Bath and surround removal | 1 lump sum | £336.00 | £336.00 |
| Shower tray allowance | 1 each | £608.00 | £608.00 |
| Wet-wall preparation and waterproofing | 7 sq m | £155.00 | £1,085.00 |
| Wall finish installation | 7 sq m | £206.67 | £1,446.69 |
| Valve trim and screen allowance | 1 set | £784.00 | £784.00 |
| Disposal and final seal | 1 lump sum | £152.00 | £152.00 |
| Illustrative total | £4,543.69 | ||
Adding the 7 exact line amounts gives £4,543.69. 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
Remove one bath and fit a shower in the same alcove, with a new base, wall finish, valve trim and screen allowance. Existing supply and drain positions remain.
Outside this example: No bathroom layout change, concealed structural repair or whole-room repainting.
The role in this brief is refurbishment 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 the finished alcove on three sides, the wet-wall area and the drain location before selecting the base.
- Keep the shower tray, screen and finish tile as named allowances until the products are selected.
- Confirm water shutoff, demolition, waterproofing inspection and curing time before promising a handoff date.
- Rot behind the surround or a drain that cannot align with the chosen base changes the work.
Compare the written scope with every line in the bath to shower conversion 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 bath to shower conversion estimate?
Measure the finished alcove on three sides, the wet-wall area and the drain location before selecting the base.
When should this bath to shower conversion quote be revised?
Rot behind the surround or a drain that cannot align with the chosen base changes the work. No bathroom layout change, concealed structural repair or whole-room repainting.
FROM SITE NOTES TO AN ITEMISED PDF
Build your own bath to shower conversion 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.
