Wall Knock-Through Structural Calculations
Transform your living space with confidence using Calcs-Online’s wall knock-through structural calculations. Whether you’re planning to create an open-plan layout or remove a load-bearing wall, our structural engineers work out the beam and the support it needs, so the change is safe and compliant with building regulations.
- Worked remotely by structural engineers
- 100% approval, or your fee refunded
- 9,000+ projects since 2012
Your wall knock-through solution
Worked from your drawings: whether you’re removing walls to create an open-plan layout or modifying existing structures, the calculations are for your wall, your span and the load above it.
Expert Analysis: We assess the structural implications of wall removal, load redistribution, and reinforcement requirements, ensuring that your knock-through project maintains the stability and safety of your home.
Approved, or refunded: building control has approved every set of calculations Calcs-Online has issued; if yours were refused, we would refund the fee.
Why wall knock-through projects require structural calculations
Wall knock-throughs are an increasingly popular choice for homeowners looking to modernize their homes with open-plan layouts. However, removing or altering walls—especially load-bearing ones—is a complex process that requires precise structural calculations to maintain the integrity of your property. Without these calculations, you risk structural instability, safety hazards, or costly mistakes.
Key reasons to invest in structural calculations for wall knock-throughs:
Common scenarios for wall knock-throughs
1. Creating open-plan living spaces
Open-plan layouts are ideal for creating a sense of space and flow in modern homes. Wall knock-throughs enable:
- Larger, brighter rooms with better natural light distribution.
- One room from the kitchen through to the living area.
2. Extending living areas
Removing walls to extend a room—such as combining two smaller rooms into one larger space—requires careful load redistribution to maintain the stability of your home.
3. Loft conversions and home extensions
Incorporating new layouts in loft conversions or extensions often involves knocking through walls to create larger, functional spaces.
4. Adding bi-fold doors or windows
Creating wide openings for bi-fold doors or large windows often involves removing sections of load-bearing walls. Structural calculations ensure these changes are safe.
The Calcs-Online process for wall knock-through structural calculations
At Calcs-Online, we simplify the process, making it easy for homeowners, architects, and builders to get the expert calculations they need.
1. Initial consultation
Share your project details with our team, including wall dimensions, property plans, and your goals for the knock-through.
2. Photos and measurements (if required)
For complex projects, we may ask for extra photographs or measurements of your property’s structure. Calcs-Online works remotely and does not visit site.
3. Structural calculations
Our engineers work out:
- Beam size, material, and placement (RSJ, timber, or concrete).
- Load redistribution to maintain stability.
- Deflection limits to prevent excessive sagging or bending.
4. Building regulations approval
We provide all necessary documentation to help you secure building control approval, ensuring your project complies with local regulations.
5. Ongoing support
From initial design to project completion, our team is available to answer questions and provide additional documentation as needed.
Key structural considerations for wall knock-throughs
1. Load-bearing walls
Before knocking through a wall, it’s essential to determine whether it’s load-bearing. These walls support the structure above, such as upper floors or the roof. Removing a load-bearing wall without proper calculations can lead to:
- Structural instability.
- Cracks or sagging in adjacent walls or floors.
- Potential collapse of the structure.
2. Beam selection
Replacing a load-bearing wall typically involves installing a beam to redistribute the weight. The type and size of the beam depend on factors such as:
- Span length (distance between supports).
- Load weight (including live loads like furniture and dead loads like building materials).
- Material properties (steel RSJs, timber, or concrete).
3. Deflection limits
Deflection refers to how much a beam bends under load. Our calculations ensure the deflection stays within acceptable limits, preventing sagging and maintaining structural integrity.
4. Foundation adjustments
In some cases, the weight redistributed by a new beam requires foundation reinforcements to prevent settlement or instability.
Why choose Calcs-Online for wall knock-through calculations?
1. 9,000+ projects since 2012
From a single doorway to a whole ground floor opened up, our team has worked knock-throughs of every size.
2. Delivered on the day you pick
We understand that timing matters. Pick the delivery day from the calendar that comes with your price; each day shows its own price.
3. Competitive pricing
Our pricing is transparent: you get your price before you commit.
4. Nationwide coverage
Calcs-Online works remotely from your drawings, so the project can be anywhere in the UK.
5. Approved, or your fee back
Building control has approved every set of calculations Calcs-Online has issued. If yours are not approved, we refund your fee in full.
Want an engineer to look first?
Get in touch before you buy.
Worked from your drawings
Calcs-Online works remotely: send the plans and photos, and the calculations come back ready for building control.
Approved, or refunded
Our structural calculations have a 100% approval rate across 9,000+ projects since 2012. If yours are not approved, we refund the fee.
Frequently asked questions
What is involved in the structural calculations for a wall knock-through and do I need a structural engineer?
The need for a structural engineer and the complexity of the calculations depend on whether the wall you’re removing is load-bearing or not.
Load-bearing wall: You definitely need a structural engineer. These walls support the weight of the structure above, and their removal requires careful calculations to ensure the building remains stable. A structural engineer will assess factors like load redistribution, potential reinforcements, and overall structural integrity to ensure a safe and compliant project.
Non-load-bearing wall: While you might not legally require a structural engineer for a non-load-bearing wall removal, it’s still highly recommended to consult one. They can confirm if the wall is indeed non-load-bearing and assess any potential impacts on the building’s structure, ensuring your renovation is safe and structurally sound.
In either scenario, a structural engineer can provide valuable expertise and peace of mind, ensuring your project is completed safely and in compliance with building regulations.
When will I get my structural calculations?
On a day you pick yourself. Your price comes with a calendar, and each date on it shows what it costs, so you choose the day that fits the work.
Do you need to visit my home for structural calculations?
No. Calcs-Online works remotely, from your drawings and photographs, and does not visit site. Building control has approved every set of calculations Calcs-Online has issued; if yours were refused, we would refund the fee.
What do I need to do to get structural calculations
To ensure precise structural calculations, we ideally need detailed architectural drawings. However, for simpler projects, basic sketches and photos may suffice. Calcs-Online works remotely and does not visit site, so the drawings and photos you send are what we work from.