Ceiling plastering

For UK homeowners, plastering is often considered a "dark art." It requires speed, precision, and physical stamina—especially when working overhead against gravity. This guide breaks down the costs, processes, and essential regulations involved in achieving a flawless finish.

What Does the Work Involve?

Ceiling plastering is a multi-stage process that prioritises preparation to ensure the final finish doesn't crack or delaminate. A typical project follows these steps:

• Site Protection: Covering floors and furniture with heavy-duty drop cloths and taping plastic sheeting to walls to contain dust and splashes.
• Surface Assessment: Checking for "blown" (loose) plaster, damp spots, or structural sagging.
• Preparation: Removing loose material and applying a bonding agent (like PVA or Blue Grit) to ensure the new plaster adheres to the old surface.
• Overboarding (Optional): If the original ceiling is in poor condition or made of old lath and plaster, new plasterboards are screwed directly over the existing ceiling.
• Taping and Jointing: Applying scrim tape to all board joints or cracks to prevent future movement and hairline cracking.
• The Two-Coat Skim: Applying a 2-3mm "backing" coat of multi-finish plaster, followed by a second "finishing" coat while the first is still tacky.
• Trowelling Up: Polishing the surface with a clean trowel as it sets to achieve a glass-smooth finish.

Typical Costs

Pricing for ceiling plastering depends heavily on the room size, the height of the ceiling, and whether you are simply skimming an existing surface or installing new boards first. Prices below include VAT and typical UK material costs for 2025/26.

Cost Factors: Regional variations are significant; expect to pay 20-30% more in London and the South East. High ceilings (over 2.4m) or complex shapes like bay windows and decorative cornices will also increase the labour time and total quote.

How Long Does It Take?

The duration of the job depends on the complexity and the drying conditions in your home. Below are typical timeframes for the "on-site" work:

• Small Patch Repair: 2–4 hours (one visit).
• Standard Room Skim: 1 full day (including prep and clean-up).
• Overboarding and Skimming: 1.5–2 days (Day 1 for boarding/taping, Day 2 for skimming).
• Full House (Empty): 5–10 days depending on the number of rooms and crew size.

Pro Tip: While the physical work may take one day, the plaster will take 3 to 5 days to dry completely (turning from dark pink to a uniform pale pink) before it can be painted.

DIY or Professional?

Plastering is widely regarded as one of the hardest DIY tasks to master. While a DIYer can often achieve a decent finish on a small wall, ceilings are significantly more difficult due to the physical strain of working overhead and the speed required to finish the entire surface before the plaster "sets."

Why Hire a Professional? A professional plasterer has the muscle memory to apply even pressure across the entire ceiling, ensuring there are no visible ridges or "fat" spots. Furthermore, working at height carries safety risks; professionals use proper hop-ups or scaffolding towers that meet UK safety standards. If you are dealing with Artex, a professional can also advise on asbestos risks, which is vital for homes built before 2000.

Choosing the Right Tradesperson

Finding a reliable plasterer is key to avoiding a "wavy" ceiling that looks poor under spotlighting. Use these criteria when hiring:

• Check Qualifications: Look for NVQ Level 2 in Plastering or City & Guilds certifications.
• Ask for Portfolios: A good plasterer will have photos of "shining" (finished) ceilings. Check for smooth edges around light fittings and coving.
• Insurance: Ensure they have Public Liability Insurance (minimum £1m) to cover any accidental damage to your property.
• The "Cleanliness" Test: Ask how they plan to protect your home. A messy plasterer can cause permanent damage to carpets and woodwork.

Questions to ask:

• "Will you be using a bonding agent like Blue Grit or just PVA?"
• "Does the quote include the removal of all waste and old plasterboards?"
• "How long do you recommend I wait before applying a mist coat of paint?"

UK Regulations

While most internal plastering doesn't require Planning Permission, there are specific UK Building Regulations and safety standards to keep in mind:

• Asbestos (Control of Asbestos Regulations 2012): Many Artex ceilings applied before 1999 contain white asbestos. If you plan to scrape or sand it, you must have it tested. Most plasterers prefer to "overboard" or "skim over" Artex to encapsulate it safely.
• Part L (Conservation of Fuel and Power): If you are replacing more than 50% of a ceiling that sits under an unheated loft space, you may be required to upgrade the insulation to meet current U-value standards.
• Fire Safety (Part B): Plasterboard is used to provide fire resistance between floors. If you are replacing a ceiling, you must ensure the boards used (usually 12.5mm) meet the required fire rating for your property type.

Common Problems

Avoid these common pitfalls to ensure your new ceiling lasts for decades:

• Cracking at the Joists: This happens if the plasterer fails to use scrim tape on the joints between plasterboards. Always insist on taped joints.
• Delamination (Peeling): If the ceiling wasn't properly cleaned or primed before skimming, the new plaster may peel away from the old surface.
• "Hungry" Boards: If the plaster is applied too thinly or the boards weren't sealed, the joints may "ghost" through the finish, becoming visible even after painting.
• Visible Trowel Marks: Often caused by the plasterer "working" the plaster for too long as it dries, or failing to use enough water during the final polish.

Frequently Asked Questions

Can you plaster over Artex?

Yes, provided the Artex is firmly bonded to the ceiling. The plasterer will usually knock off the high points, apply a strong bonding agent (like Blue Grit), and then apply two coats of multi-finish plaster. If the Artex is failing or contains asbestos, overboarding with new plasterboard is the safer and more durable option.

How long should I wait before painting a new ceiling?

You must wait until the plaster is completely dry, which usually takes 3 to 7 days depending on ventilation and weather. The plaster will turn from a dark reddish-brown to a light, consistent pink. Your first coat must be a "mist coat"—a mixture of watered-down emulsion—to seal the porous plaster.

Why do I have small cracks in my new plaster?

Minor hairline cracks can occur due to "shrinkage" if the room was too hot while the plaster was drying (e.g., if the heating was left on high). These are usually superficial and can be filled with a fine surface filler before painting. Larger cracks may indicate structural movement or a lack of scrim tape on joints.

Do I need to remove my furniture?

Ideally, yes. Plastering is a wet and messy trade. If furniture cannot be moved out of the room, it should be grouped in the centre and covered with heavy-duty plastic sheeting. Most plasterers require a clear perimeter to move their ladders or towers safely.

What is "overboarding"?

Overboarding involves screwing new sheets of plasterboard directly into the wooden joists through the old ceiling. This is the best way to fix old lath and plaster ceilings that are sagging or cracked, as it provides a brand-new, stable surface for the plaster to bond to.