The best time is before making irreversible decisions
An interior designer should not be brought in only once the renovation has already been defined and all that remains is choosing finishes. Their contribution begins with reading the home, understanding the routines of those who live there and translating them into layout, lighting, materials, storage and furniture.
Moving a door affects circulation and furniture placement. Opening up the kitchen changes the lighting and its relationship with the living room. Choosing a floor finish influences levels and junctions. When these decisions are made separately, the room for correcting inconsistencies becomes smaller.
That is why the interior designer should become involved before the home is constrained by purchases, quotations or work that has already been carried out.
Before buying a home
Involving an interior designer during the search or before completing a purchase can help assess the spatial potential of a property. This does not replace a technical or legal inspection, but it does provide an analysis focused on how the home can be used.
During a visit, the interior designer can assess whether the floor plan can accommodate the desired layout, where natural light enters, how the rooms relate to one another and which needs would require a more substantial intervention. When the purchase is linked to a renovation, the question is not only whether the home is appealing today, but whether it can be sensibly adapted to the intended way of living.
Before requesting construction quotations
Requesting quotations without a defined project often leads to unclear comparisons. Each contractor may interpret the scope differently, include different levels of quality or leave decisions open until construction begins.
The interior designer translates requirements into a specific proposal: layout, lighting, electrical points, joinery, finishes, fixed furniture and finishing criteria. This allows everyone preparing a quotation to work from the same basis.
Not every detail needs to be resolved before obtaining a budget, but enough should be defined to make informed decisions. The article on what an interior designer does during a full renovation explains how the project connects the initial idea with execution.
Before finalising the layout and installations
The layout contains some of the most difficult decisions to change later. Once partitions have been built, installations routed or fittings installed, any modification can affect several areas of work.
The floor plan must respond to everyday life
Before deciding where one room ends and another begins, it is important to study circulation, privacy, storage and actual furniture positions. A floor plan may look spacious on paper and still function poorly once doors, wardrobes, tables and circulation routes are introduced.
That is why analysing how to improve the layout of a home should come before construction. The aim is not to open everything up, but to create clearer relationships between spaces.
Lighting needs architecture and furniture
Lighting points should not be decided without understanding uses, circulation and furniture placement. A pendant above a dining table or integrated lighting inside a wardrobe depends on precise dimensions. When lighting is developed as part of the project, it supports the architecture and makes it possible to create suitable scenes for different moments.
Before buying materials or furniture
A kitchen, flooring or wardrobe should not be purchased in isolation. Their dimensions, tones, joints, openings and junctions need to relate to the overall project.
Buying too early can lock in decisions that have not yet been properly tested. A kitchen may restrict circulation; a sofa may affect the position of sockets and lighting; a standard piece of furniture may waste a wall that would have benefited from a bespoke solution.
An interior design project organises these choices so that materials, furniture and lighting follow the same logic.
What happens when the interior designer joins too late
Joining late does not mean an interior designer can no longer add value. They can review decisions, resolve junctions, improve lighting or organise materials and furniture. However, they begin with constraints created by elements that have already been purchased or installed.
The main loss is not always financial. There is also less freedom to compare alternatives. An installed door, an ordered floor finish or a kitchen already in production all reduce the possibility of reorganising the home from a global perspective.
The article on partial versus full renovation helps distinguish whether a problem is localised or affects the home as a whole.
A sensible sequence
The right moment is usually before purchasing a home that will require changes, defining the scope of the renovation, requesting fixed quotations or ordering materials and furniture.
From there, the process moves from assessment to layout, documentation, material selection and site follow-up. In a full home renovation, this continuity coordinates decisions that would otherwise be spread across different stages and suppliers.
Sebastián Bayona Studio is a residential interior design studio in Barcelona that approaches the home as a whole: layout, light, materials, furniture and execution are studied in relation to the way it will be lived in.
If you are considering buying or renovating a home, contacting the studio before finalising the main decisions allows the property to be assessed while there is still genuine room to choose.
FREQUENTLY ASKED QUESTIONS
Should I hire the interior designer before the contractor?
It is advisable to define the scope and the interior design project first, although the contractor can become involved early to provide information on execution and costs. With a common basis, quotations are easier to compare.
Can an interior designer visit a property before I buy it?
Yes. They can analyse the layout, light, circulation and potential for adaptation. This assessment does not replace technical or legal reports, but it helps determine whether the property can accommodate the intended programme.
Is it too early if I do not yet have a fixed budget?
No. The budget should form part of the initial decisions. The interior designer can help establish priorities and define where resources should be concentrated before purchases are committed or construction begins.
Does it still make sense to hire an interior designer if the work has already started?
Yes, although there will be less flexibility. They can review materials, lighting, furniture and junctions, as well as maintain consistency between the remaining decisions. The further the work has progressed, the more constraints there will be.