Wabi sabi interior design is the practice of choosing materials and finishes for how they will look after years of use, not for how they look on the day of the photo shoot. The term comes from a Japanese aesthetic that finds beauty in things that are imperfect, impermanent and incomplete, and in a restaurant or bar it becomes a practical rule: if a surface cannot take a scratch, a spill or a monsoon season and look better for it, it is the wrong surface. UNFORMALDESIGN, the Bangkok-based interior design studio led by Italian architect Alessio Carta, designs hospitality and F&B spaces across Thailand on exactly that rule. This article explains what it means in a commercial room, how to tell patina from damage, and which materials earn their age.
What wabi sabi interior design means in a commercial space
Wabi sabi interior design in a commercial space means specifying materials whose wear is part of the design, so that the room gains character through use and does not need to be returned to its opening day condition. The phrase was brought to a Western design audience largely by Leonard Koren’s 1994 book on the subject, which defines it as the beauty of things imperfect, impermanent and incomplete.
Most online advice on the style is written for living rooms: linen, neutral colours, a handmade bowl on a shelf. A restaurant is a harder test. A chair that is used for two seatings a night is sat in more than 600 times a year, floors are mopped daily, and relative humidity sits above 70 percent for most of the year. A pristine finish is a photo day trick in those conditions. It lasts one shoot and starts losing an argument with reality the next morning.
The commercial version of the idea is therefore less about a look and more about a question asked of every surface before it is specified: what will this be in year three?
Patina or damage: how to tell the difference
Patina is change that a material was chosen to undergo, and damage is change that the material was never meant to survive. The same scratch can be either, depending on what it is scratched into. That distinction decides whether an ageing room reads as rich or as neglected, and it is made at specification stage, not by the cleaning team.
| Patina | Damage | |
|---|---|---|
| What changes | The surface of a solid material | A thin coating over a different material |
| Typical example | Solid timber worn pale at a bar edge | Laminate chipped to show the board under it |
| Does it go all the way through? | Yes, the material is the same at any depth | No, the look is a layer less than 1 mm thick |
| How it is repaired | In place: oil, wax, a touch of plaster | Replacement of the panel or piece |
| What guests read | A room with a history | A room that needs money |
| Cost profile | Higher at fit-out, low afterwards | Lower at fit-out, repeated afterwards |
The working test is depth. If a material is the same thing all the way through, such as solid wood, plaster, raw steel, stone or concrete, wear exposes more of the same material and the surface simply becomes more itself. If the look is a printed or sprayed layer over something else, wear exposes the something else.
Materials that age well, and what each one needs
Materials that age well in a restaurant are solid, repairable in place and honest about what they are, and each one still needs a specific kind of care. Choosing them is not the same as choosing no maintenance.
| Material | What it becomes | What it needs | Where it fails |
|---|---|---|---|
| Hand applied plaster | Gains texture and depth, softer tone, visible hand | Breathable finish, occasional local patching | Behind sinks and at splash height without protection |
| Raw or blackened steel | Darker, uneven, develops a natural patina | Wax or oil, a decision on how much patina is welcome | Table tops where acid and water sit |
| Solid timber | Paler at touch points, rounded edges | Oil once or twice a year | High gloss lacquer, which chips and shows every mark |
| Exposed concrete | A map of use: darker paths, polished patches | A penetrating sealer in food areas | Kitchens and bars without sealing, where oil stains |
| Copper and brass | Bright to brown within months indoors | Nothing, unless the client wants it kept bright | Where a uniform mirror finish is part of the brand |
Hand applied plaster is the clearest case. It gains texture and depth, and it looks better for it, because the surface follows the hand that laid it. Metal that develops a natural patina, and wood that weathers into more character over time, follow the same logic. Age doesn’t have to mean deterioration. In a well designed space, materials can gain character over time.
Where UNFORMALDESIGN has built this way
UNFORMALDESIGN describes its own work as raw, refined, alive and emotional, and the studio’s material system is built on industrial and everyday objects used as architecture: pallets, PVC crates, oil barrels and glass bottles. Those choices share the property described above. They are solid, they are what they appear to be, and they take wear without pretending otherwise.
Ombra Modern Tavern in Bangkok, a 100 square metre Italian restaurant and wine bar at Seenspace Thonglor, was built from rustic hand applied plaster and hand painted panels, surfaces that gain depth as the room is used. AILATI in Bang Rak works inside a Sino-European heritage building, where the existing fabric was already decades into its own ageing and the design was layered onto it. On Koh Samui, the Nikkei restaurant Fria was specified for salt air and humidity so that the room still looks considered in year three. The studio’s scope runs from cafés of around 90 square metres to hotels of 10,000 square metres, and the rule is the same at both ends.
Two limits are worth stating. First, this approach does not suit every brand: a concept built on a flawless, glossy, uniform finish should not be forced into raw plaster. Second, wear has to be edited. A designed room decides where ageing is welcome and protects the places where it is not, such as food preparation surfaces, wet areas and anything covered by hygiene rules.
A note on search demand: Google Ads Keyword Planner data pulled on 21 September 2026 records around 50 monthly searches for “wabi sabi interior design” in Thailand and 30 in Bangkok, 10 for “patina interior design”, and none for “material system interior design” or “restaurant interior materials”. Most of that demand is residential. This page is written for the owner of a restaurant, bar or hotel who likes the idea and needs to know whether it survives a Friday night.
Working with UNFORMALDESIGN
The useful brief is not a mood board of perfect rooms. It is a description of how hard the space will be used, and for how long. For hospitality and F&B projects in Bangkok and across Thailand that are meant to look better in year five than on opening night, reach UNFORMALDESIGN at alessio@unformaldesign.com or WhatsApp +66 97 112 3561.
Frequently Asked Questions
What is wabi sabi interior design? Wabi sabi interior design is an approach based on a Japanese aesthetic that values things that are imperfect, impermanent and incomplete. In practice it means natural, solid materials such as plaster, timber, stone and raw metal, left to show their texture and to change with use, in place of glossy uniform finishes that must be kept looking new.
Does wabi sabi interior design work in a restaurant or bar? Yes, and commercial spaces are where the approach is most useful. A restaurant surface is touched, cleaned and knocked hundreds of times a year. Solid materials that are the same all the way through wear into patina, while thin coatings wear into visible damage, so a wabi sabi specification usually costs less to keep presentable over a lease.
What is the difference between patina and damage? Patina is surface change on a solid material that was chosen to age, such as timber worn pale at a bar edge or copper turning brown. Damage is wear that breaks through a thin finish to a different material underneath, such as chipped laminate. Patina is repaired in place with oil, wax or plaster. Damage requires replacement.
Which interior materials age well in Thailand’s climate? Hand applied plaster with a breathable finish, solid timber finished in oil, exposed concrete with a penetrating sealer, raw or waxed steel indoors, and copper or brass all age well in Thailand’s heat and humidity. High gloss lacquers, thin laminates and printed surfaces tend to chip, lift or fade and show every mark.
Do materials that age well need maintenance? Yes, but it is lighter and cheaper than replacement. Solid timber needs oil once or twice a year, steel needs wax or oil, concrete in food areas needs a penetrating sealer, and plaster needs occasional local patching. None of these surfaces needs to be returned to its opening day condition, which is where most refurbishment budgets go.
The takeaway
Wabi sabi interior design, applied to a restaurant, bar or hotel, is a specification discipline: choose materials that are solid, repairable and honest, decide where wear is welcome, and let the room improve with use. UNFORMALDESIGN designs hospitality interiors in Thailand on that principle.
Internal links: /material-system/ (the UNFORMALDESIGN material system) · /hospitality-interior-design-thailand/ (hospitality interior design in Thailand) · /interior-design-koh-samui/ (interior design on Koh Samui) · /projects/ (projects) · /about/ (about Alessio Carta)