The best wall finish for an older Australian home is rarely decided by the material name alone. First establish what the wall is made of, why its finish is failing and how much of the original surface can reasonably stay. Sound hard plaster may be worth repairing. Plasterboard may suit a new partition or a carefully designed lining over existing masonry. Neither is a reliable shortcut around dampness, unstable backing or unresolved building movement.
Start with a wall-by-wall assessment rather than a whole-house assumption. Older homes often contain original masonry, later framed partitions and several generations of patching. A mixed solution can preserve useful original fabric while providing a practical surface where rooms are being changed. The goal is a coherent finished interior supported by a suitable wall system.
Clarify what each contractor means by plaster
Plasterboard lining
Plasterboard is a manufactured sheet lining, commonly fixed to framing and finished at its joints. Different boards and complete systems serve different purposes, so a quote should identify the actual board and construction. The word plasterboard alone does not establish acoustic, fire, impact or moisture performance.
It can also be used over suitable masonry with an appropriate installation method. Gyprock’s masonry adhesive information confirms a product specifically intended for fixing plasterboard to masonry and concrete. That establishes an available method, not blanket suitability for every old wall. The existing surface and selected system still need assessment before work is specified.
Hard plaster over masonry
Hard plaster generally describes a wet-applied finish associated with a solid background, often involving a base layer and a finishing coat. For example, Gyprock describes its Hardwall Plaster as a finishing coat commonly applied over cement render or concrete. Ask the plasterer to name each proposed layer rather than assuming one product provides the entire wall build-up.
In older homes, existing plaster can differ from a modern hardwall system. Its composition, backing and condition need to be understood before selecting repairs. A trade description used for quoting should not be treated as a laboratory identification of the original material.
Keep lath-and-plaster separate in the assessment
If the existing finish is supported on laths rather than directly on masonry, tell the contractor that the scope needs to address that construction. It is not simply the same repair on a different colour wall. Ask an appropriately experienced person to assess retention, loose areas and the condition of the supporting material before demolition or replacement is agreed.
Read the wall before choosing a new surface
Describe what you can observe without destructive testing. Is the finish cracked at an old doorway, flaking near the floor, stained below a window or damaged where a cupboard was removed? Record whether the problem changes after rain or returns after repainting. Those patterns give the assessor more useful information than a general request to make the walls smooth.
Cracks need context. A local surface defect and ongoing movement in the building require different responses. Ask the builder whether structural advice is needed, particularly where cracks are accompanied by displacement or changes in nearby doors and windows. Do not let a new lining become the only response to an unidentified cause.
Moisture also needs investigation before the wall is covered. Your Home explains that masonry is not completely waterproof and that water movement can carry salts through it. Painting or sheeting over the visible result does not establish that the source has been resolved. Ask who will diagnose the problem, what repairs are needed and how readiness for relining will be assessed.
Where original fabric contributes to a protected interior, check heritage approval requirements before removal. Even without formal protection, retaining serviceable plaster can preserve details around openings that are difficult to reproduce once stripped away.
Compare four realistic renovation approaches
| Approach | When it deserves consideration | What must be resolved |
|---|---|---|
| Repair retained hard plaster | Most original material is sound and damage is localised | Cause of failure, repair compatibility and final surface appearance |
| Renew a wet-applied plaster system | Masonry remains suitable but substantial finish replacement is needed | Background preparation, selected layers, drying and decoration |
| Line suitable masonry with plasterboard | A new surface is appropriate and a compatible fixing system is available | Moisture, surface suitability, lining depth and all perimeter junctions |
| Construct a separate framed lining | The design requires a new plane, service space or other coordinated upgrade | Space loss, moisture design, fixings, services and complete assembly performance |
These options do not have a fixed ranking from cheapest to best. Local repairs can become labour intensive when many small areas are scattered across a room. A new sheet lining may appear economical until every window reveal, power point and skirting junction needs alteration. Compare finished outcomes rather than square-metre rates with different exclusions.
Preserve depth at doors, windows and existing trim
Any additional lining changes the wall’s finished face. Have the contractor show that change at door jambs, window reveals, skirting and built-in cupboards. A few extra layers can leave an architrave looking recessed or a sill projecting less than intended. Those junctions should be designed before the main wall work begins.
Check the smallest usable spaces carefully. Narrow hallways, the gap beside a bed and the clearance for cupboard doors can be affected by a new lining plane. Use the proposed finished dimensions on the room plan. Nominal board thickness does not account for every backing, framing or levelling component.
If windows are also changing, coordinate the wall treatment with window replacement planning. It may be more practical to resolve the reveals as one job than to finish the wall and reopen it for a later window installation.
At floor level, establish whether original skirting will stay, be removed and reinstalled, or be replaced. A deeper lining can change how it meets adjoining rooms and door trim. Include the relevant skirting replacement work in the wall quotation rather than treating it as an unrelated cosmetic extra.
Plan services and wall-mounted furniture early
New lining offers a chance to coordinate power points, switches and data outlets, but it does not authorise unplanned service alterations. Have licensed trades assess the existing installation and price the work. Mark final outlet locations against furniture so a newly smooth wall does not immediately need more openings.
Tell the builder what will hang on the finished surface. Wall cabinets, shelving, large mirrors and televisions need suitable support for the actual load and wall construction. A fixing intended for one lining arrangement cannot be assumed suitable for another. Ask for the proposed support locations to be recorded before they are concealed.
In masonry, chasing for services may affect more than the surface finish. The responsible trade and building professional should determine the permitted method and any structural implications. Homeowners should not cut channels into an existing wall to make the plastering quote simpler.
- Locate all outlets, controls and fixed fittings on one drawing.
- Identify heavy items and the support they require.
- Retain access to valves, junctions and serviceable equipment.
- Record any concealed backing with photographs and dimensions.
- Confirm who reinstates the lining after each trade finishes.
- Review door and cupboard operation against finished wall dimensions.
Choose performance at the assembly level
It is tempting to judge a wall by tapping it or comparing how solid it feels. That is a poor substitute for a designed performance requirement. Sound transmission depends on the full construction and the routes around it, including doors, junctions and penetrations. Ask for a suitable system if privacy is a particular objective rather than assuming a heavier-looking finish guarantees the result.
The same discipline applies to fire performance in relevant separating walls. Have the building professional identify what must be retained or reconstructed. Decorative repair, a new service opening and a different lining system can each affect the assembly. The applicable requirements depend on the property and work being undertaken.
For thermal comfort, do not equate masonry mass with insulation. Your Home distinguishes those properties and notes that brickwork itself has relatively low thermal resistance. If relining is intended to improve comfort, request a coordinated insulation and moisture design that suits the climate and existing wall. A sheet added solely for appearance should not be sold as a complete thermal upgrade.
Price comparable finished work
The following example compares two hypothetical scopes for approximately 30 square metres of internal wall surface in an older room. It is an arithmetic exercise in AUD, with every allowance assumed to include GST. The figures are not market averages, and neither option is suitable until the wall has been assessed. Both exclude asbestos work, structural repairs, significant damp remediation and extensive electrical upgrades.
For a wet-applied renewal over an assessed masonry background, assume AUD $700 for protection and removal, AUD $1,100 for backing repairs, AUD $1,800 for the specified plaster system, AUD $450 for trim repairs and AUD $850 for painting. The illustrative base total is AUD $4,900. An additional AUD $700 reserve gives available funds of AUD $5,600.
For an assessed plasterboard lining option, assume AUD $500 for preparation, AUD $1,900 for the lining and joint finishing, AUD $700 for trim and reveal adjustments, AUD $550 for limited licensed electrical alterations and AUD $850 for painting. The illustrative base total is AUD $4,500. Adding the same AUD $700 reserve gives AUD $5,200.
The AUD $400 difference is not a general saving promised by plasterboard. It follows only from these invented inputs. A more complicated window, extra framing or a requirement to retain original trim could reverse it. Ask each contractor to identify the assumptions behind their actual offer and replace allowances with defined work as the design develops.
Manage removal, drying and decoration
Have older materials assessed before disturbance. The Asbestos and Silica Safety and Eradication Agency identifies wall and ceiling products and some old patching materials as possible asbestos locations. Use appropriate asbestos assessment before cutting, sanding or stripping uncertain material. Discuss old coatings and dust management with the contractor at the same stage.
Agree how the work zone will be isolated from occupied rooms and how debris will leave the house. A lining quote should make clear whether removal and disposal are included. Protect adjoining retained surfaces and ask whether furniture can remain safely elsewhere without blocking access.
Wet-applied work introduces drying considerations, while plasterboard joints and associated repairs also need suitable preparation before painting. Ask the contractor to set the sequence according to the selected products and actual conditions. A fixed decorating date agreed before investigation should not override the substrate requirements.
Decide on the final appearance early. A plain painted wall, a textured coating and a specialist finish may require different preparation. If you are considering limewash or Venetian plaster, have the finish supplier confirm substrate compatibility before the plasterer completes the base surface.
Set clear expectations for an older interior
Discuss whether the aim is a carefully repaired original wall or a newly constructed flat plane. Those are different outcomes. An older wall can remain serviceable while retaining some irregularity; correcting every variation may involve much more work than local repair. Mark the areas where precise alignment matters, such as behind new cabinetry or beside a long straight window frame.
Gyprock’s finishing guidance treats lighting and the intended decoration as part of finish selection. Review the wall with the planned lights and window conditions in mind. Do not discover after painting that a new wall-washing light demands a different level of preparation from the one priced.
When comparing the quotations, request the exact system, retained surfaces, making-good boundaries and finished dimensions. Record how concealed defects will be documented and who approves additional work. A clear scope makes it easier to distinguish a fair price from a cheaper description of a smaller job.
At completion, retain the product details, photographs of concealed work and any relevant trade records. Inspect transitions as well as the middle of each wall: openings, skirting, corners and service fittings reveal whether the whole room has been coordinated. The right choice between plasterboard and hard plaster is the one that respects the existing building while delivering the surface and function your renovation actually needs.