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Planning to remove a wall, build an extension, convert a loft, or alter the structure of your home? Rule 101 for a safe, durable and compliant build is hiring a structural engineer for structural calculations.

Read on for everything you need to know about finding and hiring a structural engineer for structural calculations covering Johnstone.

Rather we do the searching for you? Try our quick request a quote feature, and we’ll put you in touch with structural engineers covering your local area.

What are structural engineer calculations?

Structural calculations are assessments conducted by a structural engineer to determine whether proposed building work will safely support new loads and comply with UK building regulations.

They’re required for most structural alterations, including:

• Load assessment (weight your home must support)
• Beam sizing (RSJs or lintels)
• Support requirements (columns, padstones, foundations)
• Stability checks (wind loads, lateral movement)
• Documentation for Building Regulations

These calculations guide your builder and ensure the work is structurally sound.

How much do structural engineer calculations cost in Johnstone?

Expect to pay between £495 and £915 , with an average cost of £665.

That said, you can expect higher fees for older buildings, unusual layouts, or projects involving multiple load paths.

Tip: Our structural engineer cost guide dives deeper into all the costs involved.

What's included in a typical quote?

• Site visit
• Calculations
• Drawings
• Report

Additional costs may include further site visits, revisions or liaison with architects.

How long do structural calculations take?

Approximate timescales for structural calculations are:

• Simple beam calculations – 1–3 days
• Single-storey extensions – 3–7 days
• Loft conversions and larger projects – 2+ weeks

Do I need structural calculations?

Obtaining structural calculations is a requirement whenever you’re altering any load-bearing structure in your home. This includes:

• Removing or modifying load-bearing walls
• Adding RSJs or lintels
• Extensions and loft conversions
• Chimney breast removals
• Major roof or floor changes

All of the above is major structural work. Building Control will not approve structural work without valid calculations drawn up by a qualified strutural engineer.

Who can do structural calculations?

Only qualified structural engineers should produce structural calculations. Qualifications to check for include:

• Chartered Structural Engineer (MIStructE/FIStructE)
• Civil engineering degree and professional registration
• Public Liability Insurance

Avoid builders or architects offering calculations unless they are also structural engineers.

Why use Checkatrade?

• Fully checked structural engineers covering your local area
• Insurance always listed
• Easy to compare multiple profiles
• Handy reviews from local customers
• Covered by the Checkatrade Guarantee (T&Cs apply)