1. Work out the walls
A room measuring 4.5 m by 3.5 m, with walls 2.5 m high, has 40 m² of gross wall area: 2 × (4.5 + 3.5) × 2.5.
A practical budgeting guide
Plastering costs in London: what to allow for
A price per square metre helps you get started. The next question is what that price covers. Use this guide to put the wall area, preparation and finishing work into one budget before you ask for a quotation.
These are Plastering Service London’s supplied guide figures, not a live survey of London prices or a fixed offer. Confirm the current price and inclusions for your job.
Compare the work, then the price
What each plastering rate refers to
Use the area of the surface being worked on. A bedroom’s floor area is not its wall area, and a price for the walls does not automatically include the ceiling.
| Work | Guide allowance | Clarify before booking |
|---|---|---|
| Wall skimming | £10–£25/m² | Which walls are included and what preparation they need. |
| Full replastering | £20–£45/m² | The extent of removal, background work and new plaster. |
| Ceiling skimming | £15–£35/m² | Whether repairs or new boards are needed in addition to a skim. |
| Plasterboard and skim | £20–£40/m² | Board specification, fixing method and the areas covered. |
| Local repairs | From £150 | The size and number of patches, preparation and making good. |
| Day-rate allowance | £200–£300/day | Who the rate covers, expected days and any separate charges. |
The supplied figures do not establish VAT treatment or guarantee that every preparation, protection and waste-removal item is included. Ask for these details in the quotation.
A room with actual measurements
What might it cost to skim four walls?
“Medium room” can mean different things. Here is a defined example you can compare with your own measurements.
2. Allow for openings
Using the calculator’s standard allowances, one door removes 1.9 m² and one window removes 1.5 m². That leaves 36.6 m² to price.
3. Apply the guide
At £10–£25/m², the base range is £366–£915. The calculator’s 12% average-condition allowance takes this to £410–£1,025, rounded to whole pounds.
The example covers the walls only. Adding a skim to the 15.75 m² ceiling, with the same condition allowance, gives a combined estimate of £675–£1,642. New ceiling boards are not included in that calculation.
These numbers illustrate the model rather than a completed customer job. Use your own dimensions in the plastering cost calculator and read its assumptions before relying on the result.
Preparation and scope
Why equal-sized rooms can have different prices
One room may be ready for a fresh finish. Another may have damaged areas, old repairs or sections that need more work before finishing can begin. The same wall area doesn’t necessarily mean the same job.
Ask which preparation is included in the price and which items still need assessment. If your budget is limited, explain that early so the work can be discussed in clear parts.
Edges, openings and access
There is more to a room than square metres
Alcoves, window reveals and fitted furniture can make a simple room measurement less representative of the work. Access to the property and the arrangements for moving materials also deserve a mention.
For a London flat, include the floor, stairs or lift, and parking arrangements in your enquiry. Those details help explain the job more accurately than a room size alone.
Pricing by time
Read a day rate alongside the expected total
The supplied guide includes £200–£300 per day as a budgeting allowance. Before using it, ask whether it refers to one plasterer, what a working day covers and which costs are separate.
A daily figure doesn’t tell you how many visits the job will need. Ask for the expected number of days and how extra time would be agreed.
Pricing by job
Make sure the quotation describes the finish line
A project quotation is easier to understand when it names the rooms, surfaces and work included. Check where the plasterer’s work ends and where another trade, such as the decorator, takes over.
Keep any agreed changes in writing. For a fuller checklist, see our guide to comparing plasterers and quotations.
Keep the budget useful
Four details to settle before accepting a price
Materials and preparation
Ask what is supplied and which preparation tasks are covered. Don’t assume a short description includes every repair.
Protection and clearance
Agree who moves belongings, protects nearby areas and removes waste. Include any access restrictions in the discussion.
Tax and payment
Confirm the total payable, any applicable VAT and payment stages. The guide rates alone don’t answer those questions.
Timing and changes
Ask how long the quote remains valid and how newly discovered work would be priced before it goes ahead.
Questions about the figures
Before you turn a budget into a booking
Why is there such a wide range for each service?
The figures leave room for differences in the work involved. They are useful for an initial budget but don’t identify the preparation or access requirements at your property. A quotation narrows the scope and price to your job.
Is the room example a price I can book?
No. It is a worked calculation using stated dimensions, opening deductions and a condition allowance. It is included so you can follow the numbers, not as an offer to complete any room for that amount.
Does the repair allowance mean every small job costs £150?
No. £150 is the starting allowance in the supplied guide and calculator. The actual cost depends on the repair being quoted; it is not a fixed price for every patch or crack.
Are painting and decorating included?
This guide is about plastering work. Do not assume painting, wallpapering or decorative preparation is included. Ask the quotation to identify any additional work you want priced.
Can I reduce the cost by doing the preparation myself?
Ask before starting. Agree exactly which tasks you can take on and whether they would change the quotation. Avoid removing finishes or buying materials on the assumption that they suit the proposed work.
How should I budget for several rooms?
List each room and separate wall work, ceiling work and repairs. Ask for the full project to be considered together, and discuss staging if needed. Multiplying one room example by the number of rooms can miss differences in scope.
Does this guide cover exterior rendering?
The rates shown are for the internal plastering services listed. For external walls, discuss the background, access and required finish through our rendering service enquiry instead of applying an internal skimming rate.
Need service details? Read about wall and ceiling skimming or external rendering.
Get a price for the work you actually need
Send a short list of the surfaces, measurements and photos. We’ll discuss the details behind your budget and the next step towards a free quotation.