Plastered Walls vs Timber Interiors: Selecting the Best Internal Finish
The interior finish of your garden room shapes every moment you spend inside it. It determines how the space photographs, how light behaves, how furniture sits against the walls, and how the room feels at different times of day. The two dominant choices for premium garden room interiors are skimmed plasterboard — replicating the feel of a high-end domestic room — and real timber lining — creating a Scandinavian lodge aesthetic that is warm, textured, and architecturally distinctive. Both are excellent options, but they behave very differently.
Skimmed Plasterboard: Replicating a Premium, Modern Domestic Room Aesthetic
When you walk into a garden room with skimmed plasterboard walls, the impression is immediate — this feels like a room inside your house. The walls are flat, smooth, and painted in whatever colour you choose. There are no visible joins, no timber texture, no architectural language that signals this is anything other than a permanent, fully integrated extension of your home.
The construction process behind this finish is straightforward but skilled. Tapered-edge plasterboard is fixed to the internal face of the stud walls — typically 12.5mm thickness for standard applications. The joints between boards are taped with paper jointing tape and filled with jointing compound. A skimmer coat of finishing plaster — approximately 2 to 3 millimetres thick — is then applied across the entire surface by a skilled plasterer, creating a continuous, seamless finish that dries to a smooth, paint-ready surface.
The result is a wall that accepts any emulsion paint — matte, eggshell, or satin — in any colour. You can hang wallpaper, install shelving on standard fixings, or mount artwork exactly as you would in any room inside your house. The aesthetic flexibility is total, and if you redecorate in five or ten years’ time, the walls are ready for whatever direction your taste takes.
For garden rooms used as offices, treatment rooms, or reception areas — where the space needs to feel professional and conventional rather than rustic or architecturally expressive — skimmed plasterboard is the standard choice. It photographs cleanly, presents a neutral backdrop for branding or decoration, and signals permanence and quality in a way that timber lining does not always achieve.
Real Wood Internal Matching: Creating a Scandinavian Lodge Look
Timber-lined interiors occupy a different aesthetic territory entirely. When you step into a garden room with real wood cladding on the internal walls, the feeling is closer to a boutique forest lodge or a high-end alpine retreat — warm, tactile, and architecturally confident.
The timber used for internal lining is specified for both appearance and stability. We typically work with Whitewood (spruce) or Redwood (pine) sourced from sustainably managed Scandinavian or Baltic forests, kiln-dried to a moisture content of 8 to 12 per cent to ensure dimensional stability in a heated interior environment. The boards are machined to a V-jointed tongue-and-groove profile — typically 12mm thick with a 100mm to 150mm visible face — that creates continuous vertical lines with subtle shadow channels at each joint.
The visual effect is immediate and powerful. Vertical timber lines draw the eye upward, emphasising ceiling height and creating a sense of architectural intentionality. The natural grain — with its varied figuring, knots, and colour variation — provides a level of visual texture that no painted surface can replicate. The timber also photographs beautifully, which is why timber interiors are frequently chosen for yoga studios, reading rooms, guest accommodation, and creative workspaces where atmosphere is as important as function.
Timber interiors can be finished in several ways:
- Clear oil or lacquer — preserves and protects the timber while allowing the natural colour and grain to define the space
- White pigmented oil (Scandinavian white wash) — subtly lightens the timber while retaining visible grain, creating the pale, luminous aesthetic characteristic of Nordic interiors
- Lye treatment followed with white oil — a traditional Danish technique that chemically lightens the wood while preserving its texture, producing a soft, chalk-white surface
Each finish changes the character of the room significantly, and we guide clients through sample panels during the design stage to ensure the chosen finish matches the intended atmosphere.
How Interior Finish Decisions Impact Lighting Reflections and Sense of Space
One of the most overlooked differences between plaster and timber interiors is how they interact with artificial lighting. This is not a minor consideration — it fundamentally shapes how the room feels during evening use, which for many garden room owners represents the majority of their occupied hours.
Plastered and painted walls are reflective surfaces. A standard white emulsion has a light reflectance value (LRV) of approximately 85 to 90 per cent — meaning nearly all the light that hits the surface bounces back into the room. This high reflectance means that a single ceiling light or a pair of wall lights will illuminate the entire space effectively. The room feels brighter, more open, and often larger than its physical dimensions suggest.
Timber surfaces absorb significantly more light. Natural pine, even with a clear finish, has an LRV of roughly 40 to 55 per cent. Darker oiled finishes can drop this below 30 per cent. This lower reflectance means that the same lighting specification will produce a noticeably darker, more intimate room. Shadows are deeper, corners are less defined, and the overall atmosphere is cosier and more enclosed.
Neither approach is inherently better — but the lighting design must respond to the wall finish. A timber-lined room benefits from additional light sources — perhaps uplighters that wash the ceiling, under-shelf LED strips, or directional spotlights that highlight specific areas. A plastered room can achieve excellent results with a simpler, more minimal lighting scheme. This interaction between finish and lighting should be discussed during the design stage, not discovered after the room is built.
Comparing Installation Drying Times Before You Can Move Furniture In
The practical programme for achieving each finish differs significantly, and this affects how quickly you can take possession of your completed garden room.
Plasterboard installation and plastering requires a multi-stage process with mandatory drying time:
- Day 1: Plasterboard fixed to stud walls, joints taped and filled
- Day 2: Skim coat of finishing plaster applied across all surfaces
- Days 3 to 5: Plaster dries and cures — the surface changes colour from dark wet brown to pale pink as moisture evaporates
- Day 6: Mist coat — a thinned coat of emulsion paint applied to seal the porous plaster surface
- Day 7: Full decoration coats applied — typically two coats of quality emulsion
The total programme from plasterboard installation to a decorated, furniture-ready room is approximately 7 to 10 working days, assuming appropriate temperature and ventilation for drying. Rushing this process — particularly painting before the plaster has fully dried — leads to paint adhesion failures, blistering, and visible damp patches that can only be fixed by re-skimming.
Timber lining follows a different programme:
- Day 1: Timber boards fixed to stud walls using concealed fixings or stainless steel nails, V-jointed profiles interlocked and checked for alignment
- Day 2: Oil or lacquer finish applied — typically one to three coats depending on the specified product
- Day 3: Final coat drying and curing
The total programme for a timber interior is typically 3 to 5 working days — significantly faster than plasterboard. There is no wet plaster drying time, no mandatory mist coat, and no waiting for moisture to leave the substrate. The room can be furnished and used as soon as the final finish coat has cured.
Making the Right Choice for Your Space
Both plastered and timber interiors deliver excellent results when they are specified and installed correctly. The choice between them is fundamentally about how you want the room to feel — the clean, flexible neutrality of a plastered domestic interior, or the warm, textured character of a timber-lined Scandinavian retreat. There is no wrong answer, only the answer that best matches your intended use, your aesthetic preferences, and your lighting expectations.
At RoomRise, we offer both finishes as standard options and frequently combine them — perhaps timber on a feature wall with plasterboard on the remaining surfaces — to create balanced, architecturally interesting interiors. If you are deciding on the internal finish for your garden room, book a complimentary 3D CAD design consultation. We will show you sample finishes, discuss lighting implications, and help you choose the interior that will make your garden room feel exactly right.