
Prices and Budgets for an Interior Design Project
The average price of hiring an interior designer to execute an interior design project will depend on the type of space and project. For residential spaces, an interior designer charges around 20 €/m² and, for commercial spaces or businesses, can charge up to 35 €/m². For a space of approximately 100 m², the project can cost between 2,000 and 3,500 €.
The amounts are indicative and come from the original imported guide. The final budget depends on the scope, materials, and previous condition of the space.
Service Levels and Pricing
Choose the interior design package that best fits your space and budget.
Basic
Simplified design project with consultation and basic layout and decoration proposals. Ideal for small spaces or targeted renovations.
Standard
Complete interior design project with detailed design, plans, and construction oversight. The most popular option for homes of 80-120 m².
Premium
High-end interior design project with personalized design, full construction supervision, and luxury finishes. For large spaces or complete renovations.
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Interior design pricing
See what homeowners usually pay for the most common tasks. Use these ranges to fine-tune your scope and avoid missing key items in your budget.
Interior design project for single-family home
4,500 €
Interior design project for apartment
3,000 €
Interior design project for office
6,000 €
Interior design project for retail space
7,500 €
Interior design project for hotel
15,000 €
Work included in an interior design project with Reformia
The average cost of hiring an interior designer to execute an interior design project will depend on the type of space and project. For residential properties, an interior designer typically charges around 20 €/m², and for retail spaces or businesses, it can reach up to 35 €/m². So, for a space of around 100 m², the project can cost between 2,000 and 3,500 €.

1. Layout design
In an interior design project, studying spaces to achieve a functional distribution that maximizes the square footage of the property is essential. Sometimes it is necessary to remove walls to better distribute the rooms.

2. Furniture replacement
Beyond aesthetic or style considerations, furniture selection must take into account many other factors. It's important to consider the type of property, how it will be used, the possibilities based on the proposed layout, and even the light it receives.

3. Finishing touches
Design and finishes are essential in any interior design project. They provide the final and definitive touch. In this regard, interior designers consider aspects such as functionality and ease of maintenance, as well as budget. Thus, good finishes can make many decorative elements practically unnecessary.
The average cost of hiring an interior designer to execute an interior design project will depend on the type of space and project. For residential properties, an interior designer typically charges around 20 €/m², and for retail spaces or businesses, it can reach up to 35 €/m². So, for a space of around 100 m², the project can cost between 2,000 and 3,500 €.
What is usually included in a quote
Each professional may structure quotes differently, but most project budgets follow this logic.
Typically included
Often not included
How do interior designers work?
The average cost of hiring an interior designer to execute an interior design project will depend on the type of space and project. For residential properties, an interior designer typically charges around 20 €/m², and for retail spaces or businesses, it can reach up to 35 €/m². So, for a space of around 100 m², the project can cost between 2,000 and 3,500 €.

1. Analysis of expectations
Tastes or lifestyle can influence decoration preferences, but it must be taken into account that not everything is always possible to execute. Interior designers are specialists in offering proposals for each specific case.

2. Study of project feasibility
Once the work ideas are established, an architect or engineer is contacted to evaluate whether the planned project is feasible. Interior designers typically work in collaboration with these professionals.

3. Project development
At this stage, several conceptual proposals, ideas, and solutions for the renovation are developed. Technical plans are created: layout, dimensions, installations, etc. Some interior design studios offer the possibility of rendering the project in 3D before launching it.

4. Advice on finishes
The selection of materials for floors, ceilings, and walls is fundamental. It will also be necessary to evaluate what decorative elements will occupy the new available space.
What can change your final price
Even similar projects can end with different budgets. These are the factors that most often push costs up or down.
Space size
The price is typically calculated per square meter, making it more affordable for small spaces (apartments) than for large commercial areas or single-family homes. A 50 m² project will have a very different cost than a 200 m² one.
Project type and complexity
A full-scale renovation is not the same as superficial decoration or space redistribution. Projects requiring structural changes, wall removal, or functional rethinking significantly increase the budget.
Finishing level and materials
Selecting premium materials, recognized design brands, and customized solutions increase costs. An interior designer working with tight budgets offers more competitive prices than one using luxury materials.
Geographic location and professional experience
Interior designers with greater reputation in Madrid or Barcelona typically charge more than in other cities. Additionally, a professional with international experience or specialization in sustainable design can increase their fees.

How much does an interior designer charge?
The average cost of hiring an interior designer to execute an interior design project will depend on the type of space and project. For residential properties, an interior designer typically charges around 20 €/m², and for retail spaces or businesses, it can reach up to 35 €/m². So, for a space of around 100 m², the project can cost between 2,000 and 3,500 €.
The cost of an interior design project will depend on the type of property and the specific project. Generally speaking, an interior designer can charge by the hour, around 40 €/hour. But it's also possible that they charge based on the project cost, in which case their fees can typically range between 6% and 9%.
Advantages of hiring an interior designer
The average cost of hiring an interior designer to execute an interior design project will depend on the type of space and project. For residential properties, an interior designer typically charges around 20 €/m², and for retail spaces or businesses, it can reach up to 35 €/m². So, for a space of around 100 m², the project can cost between 2,000 and 3,500 €.
In the case of charging per m², which is another possibility, an approximate breakdown by specific items could be as follows:
In this way, for a 120 m² space, the interior design project would cost 2,400 €. If technical assistance is needed, you would need to add 360 €, meaning the total would be around 2,800 €. If instead of technical assistance project management is required, it would be 600 € more, bringing the budget to 3,000 €.
- An interior design project for a space of between 100 and 150 m² would cost from 20 €/m².
- Technical assistance during the execution of the project for that same space would cost around 3 €/m².
- In case project management is required, it would cost around 5 €/m².
Interior design aims to improve living conditions, functionality, and comfort in different spaces. But it never neglects the aesthetic aspect. To do this, it considers everything that influences the final appearance of the room or property, from finishes to furniture. In this way, highly attractive spaces are achieved that are adapted to the property's use, something especially important when it comes to retail spaces.
Increase property value
A property whose interior has been carefully designed is much more attractive. In this way, if you intend to put it on the real estate market, whether for rent or sale, the investment in interior design work pays for itself many times over. A pleasant and well-maintained space will always draw more attention from clients, and not only that, but its resale value can be increased.
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Whether you're planning a renovation or looking for your next project, Reformia gives both sides the tools to connect, compare, and collaborate with confidence.
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Frequently Asked Questions

How much does an interior design project cost in Spain?
The average price of an interior design project in Spain ranges from 20 to 35 €/m² depending on the type of space. For a 100 m² residential property, the total cost is typically around 2,000-3,500 €, while commercial spaces can reach 3,500 € or more. These prices may vary depending on the city, project complexity, and selected materials.
What work is included in an interior design budget?
A typical interior design project includes design consulting, space planning, color and material selection, and execution supervision. It may also include coordination with other professionals such as architects or contractors, although some services like construction work or material purchasing may have additional costs.
How long does an interior design project take to complete?
The duration of an interior design project depends on its complexity and size. Simple consulting projects can be completed in 2-4 weeks, while more complex projects with execution may take between 2-6 months. The design phase typically lasts 3-6 weeks, and execution varies considerably depending on the scope of work.
Do I need a license or permit for an interior design project?
In general, interior design projects that don't include structural work don't require a building permit. However, if the project involves renovations, changes to installations, or structural modifications, you will need to obtain the corresponding municipal permit. It's recommended to consult with your local municipal office before starting the project.
How do I choose the best interior designer for my budget?
To choose a good interior designer, request several detailed quotes, review their portfolio of previous work, and verify their references. Make sure the quote includes all necessary services and clearly specifies what is included and what has additional costs. It's also important that the professional understands your vision and available budget before signing the contract.
Got more questions? Contact us!

Got more questions? Contact us!
Frequently Asked Questions
How much does an interior design project cost in Spain?
The average price of an interior design project in Spain ranges from 20 to 35 €/m² depending on the type of space. For a 100 m² residential property, the total cost is typically around 2,000-3,500 €, while commercial spaces can reach 3,500 € or more. These prices may vary depending on the city, project complexity, and selected materials.
What work is included in an interior design budget?
A typical interior design project includes design consulting, space planning, color and material selection, and execution supervision. It may also include coordination with other professionals such as architects or contractors, although some services like construction work or material purchasing may have additional costs.
How long does an interior design project take to complete?
The duration of an interior design project depends on its complexity and size. Simple consulting projects can be completed in 2-4 weeks, while more complex projects with execution may take between 2-6 months. The design phase typically lasts 3-6 weeks, and execution varies considerably depending on the scope of work.
Do I need a license or permit for an interior design project?
In general, interior design projects that don't include structural work don't require a building permit. However, if the project involves renovations, changes to installations, or structural modifications, you will need to obtain the corresponding municipal permit. It's recommended to consult with your local municipal office before starting the project.
How do I choose the best interior designer for my budget?
To choose a good interior designer, request several detailed quotes, review their portfolio of previous work, and verify their references. Make sure the quote includes all necessary services and clearly specifies what is included and what has additional costs. It's also important that the professional understands your vision and available budget before signing the contract.


