When building a balcony on an old house, you first need to determine how the balcony will be supported, what size will fit the façade, and how it will be attached to the house.
These decisions affect the design, the permitting process, and how the balcony will appear on the façade. Therefore, the building’s load-bearing elements and overall appearance should be evaluated before the dimensions, fixing, and balustrade are determined.
How is a retrofitted balcony supported on an older house?
A retrofitted balcony can be anchored to the building’s load-bearing frame, supported from the ground by columns, or connected to load-bearing elements via brackets. Which method works depends on how the existing building is constructed.
In an older house, therefore, you cannot assume that the walls, floor structures or other existing structural elements are designed to support the load from a new balcony. First, the building frame must be inspected, and it must be determined where the balcony’s loads can actually be supported.
The difference lies in where the balcony’s load is transferred
Steel structure
The load is transferred to the building's load-bearing frame through a specially designed steel structure. The frame and fixings must be able to support the balcony's loads.
Columns
The load is transferred to the ground through pillars that rest on a separate foundation. The foundation must be designed based on the balcony's structure and loads.
Brackets
The load is transferred to the building’s load-bearing elements via brackets. This solution requires that both the existing structure and fixings meet the necessary conditions.
The building's structure needs to be inspected first
Timber frames, masonry, joist floors, and other load-bearing elements present different conditions. Therefore, a structural engineer must assess where the load can be supported and how the fixing should be designed before the balcony’s structure and size are finalised.
Is planning permission required to build a balcony on an old house?
A new balcony may require planning permission or other approval, depending on how it will be built, where it will be located, and the specific conditions that apply to the property. Therefore, you need to check the applicable regulations before deciding on the balcony’s final design.
When it comes to an older house, it is particularly important to distinguish between three issues: what permits are required, how the balcony fits in with the house’s existing character, and whether the building or the area has special cultural and historical value.
Permits, design, and cultural values must be assessed individually
Check which permits are required
A retrofitted balcony may require planning permission or other approval. The decision depends, among other things, on the balcony’s size, location, how it is attached to the house, and the building’s specific conditions.
Find out what documents are required before ordering the construction or starting the work. Changes to the building’s load-bearing elements may also need to be reviewed.
Preserve the character of the house when making changes
Even though a balcony can be built without planning permission, it must be designed with the building’s existing appearance and structure in mind. In older buildings, details such as window placement, façade materials, and proportions can be crucial to the overall impression.
The balcony’s location, size, materials, and design must therefore be evaluated in conjunction with the existing façade. We’ll explore how these proportions affect the overall look in the next section.
Special values may limit changes
If the house or the area has documented cultural-historical value, there may be specific requirements regarding how the façade may be altered. Even a small balcony can affect details and features that are important to preserve.
Therefore, check what restrictions apply before deciding on the balcony’s design. There may be requirements regarding materials, location, fixing, and how much of the façade may be altered.
If you are unsure about which permits or restrictions apply, contact the relevant authority before finalising the project. A simple façade sketch showing the location and approximate dimensions provides a concrete basis for obtaining guidance.
How big should the balcony be on an older house?
The size needs to be assessed in relation to the façade, not just based on how much outdoor space you want. Older houses often have a distinct rhythm in their windows, façade lines, and details, and a balcony that disrupts that rhythm can easily become overpowering.
A good starting point, therefore, is to base the balcony’s width and placement on something that already exists on the building, such as a window opening, a distinct façade line, or existing trim.
The balcony follows the existing rhythm of the house
When the width and placement of the balcony are in relation to windows, doors, or distinct façade lines, the balcony is more easily perceived as part of the house.
The balcony becomes the dominant feature
When a balcony is very wide in relation to the house, it can dominate the appearance of the façade. A discreet balustrade cannot always compensate for proportions that already feel heavy.
Therefore, do not judge the dimensions based solely on the drawing. View the balcony as part of the entire building and from roughly the same distance at which the façade is normally viewed.
When might a Juliet balcony be a better option?
A Juliet balcony may be a better option when your main goal is to let in more light, open up the room, and feel more connected to the outdoors – but you don't need a separate outdoor space to spend time in.
A Juliet balcony has no protruding living space. Instead, a door that opens is combined with a fall protection in front of the opening. This results in a smaller addition outside the façade, but also serves a different function than a full balcony.
Choose based on whether you need an outdoor space or just an opening to the outside
The choice, then, depends first and foremost on the function you need. If being able to sit outside is important, you’ll need a full balcony. If the main purpose is to open up to the outside, a Juliet balcony may be sufficient.
Even a Juliet balcony must be designed to fit the building. The door opening, the fall protection’s fixing, and how the solution integrates with the façade must therefore be planned together.
What factors affect the cost of building a balcony onto an existing house?
The cost is primarily influenced by how the balcony will be supported and attached to the house, its size, and the extent of the design and installation work required. In an older house, the existing structure can therefore affect the price at least as much as the balcony area itself.
General prices per square metre are therefore often less useful early in the project. Only once the building’s specifications, approximate dimensions, and structural design are known is it possible to compare different solutions more fairly.
Structure and connection
The load-bearing principle affects the scope of the construction. Columns may require separate foundations, while a fixing attached to the house may involve work on load-bearing elements, the façade, waterproofing, and insulation.
Size and balustrade
The width and depth of the balcony affect the amount of material needed and the construction. The choice of balustrade, fixing, and other details also affect the final cost.
Structural design and site access
Design documentation and any documents required for permits or notifications must be factored in. The cost is also affected by how easily the installation can be carried out and whether the work site requires special access or lifting equipment.
Therefore, it’s best to request a quote once the load-bearing structure and approximate dimensions are known. That way, you can compare solutions based on the same technical specifications rather than relying on a general price per square metre.
What kind of balustrade is suitable for a balcony in an older house?
A more prominent balustrade is a good choice when you want to enhance the home’s existing character, while a transparent balustrade is better suited when the façade, windows, and other original details should continue to dominate the visual appearance.
When viewed from ground level, the balustrade often becomes one of the balcony’s most prominent façade details. The choice of balcony balustrade must therefore complement both the balcony’s proportions and the building’s overall appearance. Two different balustrades can serve the same basic function yet alter the façade’s overall impression in completely different ways.
Decide whether the balustrade should enhance the house or remain in the background
- More prominent
-
Wrought-iron-style aluminium
A wrought iron balustrade becomes a more prominent feature of the façade. This can be a good choice when the house already has traditional details and the balcony is intended to be a deliberate part of the building’s overall look.
- More transparent
-
Glass without top rail
A glass balustrade without a top rail creates a more transparent boundary. This can be a good choice when you want the balcony to be as inconspicuous as possible and you want the windows, façade materials, and other existing details to remain the focal point.
What should you check before building a balcony on an old house?
Check the building’s load-bearing structure, planning permission requirements, the balcony’s proportions, its connection to the façade, and the choice of balustrade before finalising the dimensions and design solutions. This reduces the risk that a later issue will force major changes to the project.
Check these eight points
-
Do you know how the house is built?
Inspect the structural frame, floor structure and other load-bearing components to determine whether a new balcony can be supported in that location.
-
Är bärprincip och infästning bedömda?
Steel structures, columns, and brackets present different challenges. Have a structural engineer assess which approach works best for the building before the design is finalised.
-
Have you checked the permit requirements and cultural heritage considerations?
Find out what requirements apply to the building and the site. If you are unsure, contact the responsible authority early on for guidance.
-
Is the size in proportion to the façade?
Let the width and placement relate to the windows, doors, façade lines, and the proportions of the house, rather than being based solely on the desired outdoor space.
-
Have you checked the proportions of the house?
Mark the proposed balcony on the façade and look at the building from a distance. This makes it easier to compare different dimensions before you proceed.
-
Have the connections, seals, and insulation been designed?
The fixing must function both effectively and in conjunction with the façade's airtightness and insulation. These issues should therefore be addressed as part of the same design process.
-
Do you really need a full balcony?
If your main goal is to open up the room and connect more with the outdoors, a Juliet balcony can be an option when a separate outdoor space isn't essential.
-
Does the balustrade fit both the balcony and the house?
Once the balcony's size, location, and design have been determined, you can choose a balustrade that complements both the balcony and the home's existing style.
That will give you a clearer basis for the next step
Once load-bearing capacity, planning permission, proportions, connections and the balustrade have been considered, you will have a stronger basis for detailed design and final dimensions.
How do you choose a balustrade for a balcony in an older house?
Don't choose a balustrade until you've determined the balcony's dimensions, location, and style. Then you can compare options based on how visible the balustrade will be on the façade and how it complements the building's existing features.
What do you need to know before building a balcony on an older house?
Here are brief answers to frequently asked questions about load-bearing capacity, structural engineers, planning permission, other approvals, fixing, proportions, and choosing a balcony solution.
Can an older house support a new balcony?
It is not possible to determine this based solely on the age of the building. The structural frame, floor structure, masonry, and other load-bearing components must be examined to determine where the balcony’s loads can be supported and what type of support system is feasible.
When should a structural engineer be consulted for a retrofitted balcony?
The structural engineer should be consulted before the balcony’s design and final dimensions are finalised. This allows for an assessment of the building’s load-bearing elements and determines where the load can be supported and how the fixing needs to be designed.
Is planning permission required for a balcony on an old house?
Not always. A new balcony may require planning permission or other approval, depending on how it is to be built, where it will be located, and the building’s specific conditions. If the house or the area has cultural or historical significance, additional restrictions may affect what changes are permitted.
Does a balcony require other approvals even if planning permission is not required?
Yes. Even if the balcony does not require planning permission, the project may need other approvals or a technical review, especially if the building’s load-bearing elements are affected. Check this before work begins and have a structural engineer assess how the loads will be supported.
What needs to be checked when the balcony’s fixing extends through the façade?
Fixing must function both effectively and in conjunction with the façade’s waterproofing and insulation. Penetrations must be designed so that water cannot penetrate and so that unnecessary thermal bridges and the risk of condensation are minimised.
How can you tell if the balcony is too big for the house?
Compare the width and location of the balcony with windows, doors, and other distinct lines on the façade. You can also mark the planned balcony on the façade and view the house from a distance before finalising the dimensions.
Could a Juliet balcony be an alternative to a regular balcony?
Yes, if your main goal is to open up the room, let in more light, and create a closer connection to the outdoors. If, on the other hand, you need an actual outdoor space where you can spend time and set up furniture, a full-sized balcony serves a different purpose.
Should the balustrade stand out clearly or blend into the background on an older house?
It depends on the house’s existing character. A more prominent balustrade can accentuate traditional details, while a transparent balustrade may be a better choice when windows, façade materials, and other existing details should continue to dominate the visual appearance.
