Get the structural paperwork your new-build warranty provider asks for

For self-builders, developers and homeowners building new homes. Describe your project and compare quotes from structural engineers who prepare submissions for NHBC, LABC Warranty and Premier Guarantee.

A warranty provider such as NHBC, LABC Warranty or Premier Guarantee offers cover for defects in a new home, and mortgage lenders and buyers often expect one. Before they accept a project, they review its structure against their own technical standards. These sit alongside Building Regulations. A structural engineer prepares the package they need: foundation design that allows for the ground and trees, calculations and drawings for the structure, and details for anything unusual. The engineer then answers the provider’s technical queries and, if asked, inspects the work and issues a certificate. Doing this early avoids redesign and delays once you are on site.

How a professional can help

Finding out what your provider needs: They read your provider’s technical requirements and any conditions on your project. They list the calculations, drawings and certificates needed at each stage, so nothing is missing when you submit.
Foundations that meet the provider’s rules: Providers look closely at clay, tree roots and soil movement. The engineer designs the foundations from the ground investigation, the soil type and any trees nearby or removed.
A package the reviewer can follow: They organise the design as a clear package. Calculations, layouts and details refer to the drawings, so the provider’s reviewer can follow the design and approve it more easily.
Frames designed by the supplier: Where a timber frame, structural insulated panels (SIPs) or a steel frame is designed by its supplier, they check how it joins your foundations. They then fit the supplier’s information into the rest of the design.
Replying to technical queries: When the provider’s technical team raises questions, they write the replies and revise calculations or drawings where needed. You don’t have to translate engineering points yourself.
Site checks and certificates: They can visit at key stages, such as open foundations or installed steelwork. They can issue the engineer’s certificate that your provider or lender asks for. It covers only what they inspected.

Is this right for you?

You’re building a new house, annexe or conversion and your lender or buyer will want a structural warranty.
Your provider has issued conditions, such as extra foundation checks or a ground investigation, and you need an engineer to respond.
You’re a self-builder using a timber frame or panel kit and need the foundations and frame to fit together on paper.
You’re a small developer with several plots and want consistent submissions for each one.
A list of technical queries has arrived and you don’t know how to answer it.

How the project usually runs

Check the provider’s requirements: The engineer looks at your provider’s technical standards and any conditions already issued. They review the drawings, ground information and tree details, and agree what has to be submitted.
Design to both sets of rules: Foundations, beams, floors and walls are designed to meet Building Regulations and the provider’s own requirements. Extra care goes in where the ground, trees or drains call for it.
Prepare and submit the package: Calculations, drawings and any supplier designs are compiled and sent to the provider, usually alongside your building control submission. A clear list shows what each document covers.
Answer the reviewer’s queries: The provider’s reviewer may ask for more information or changes. The engineer replies, updates the design and resubmits until the provider is content.
Build checks and certificates: During the build, the provider or building control inspects key stages. The engineer can check structural items before they are covered and issue a certificate if one is required.

What affects the cost

How many homes or plots are involved, and how repeatable the structural design is between them.
Whether a ground investigation and tree information already exist, or still need arranging.
Non-standard structure, such as a basement, steel frame, retaining walls or long-span openings.
Whether the frame is designed by a supplier, and how much information has to be coordinated.
How many queries or revisions the provider raises, which is hard to predict at the start.
How many site visits and certificates your provider or lender requires.

Warranties, Building Regulations and the UK nations

A warranty is separate from Building Regulations approval. Your new home still needs building control sign-off as well as the provider’s review. In Scotland that means a building warrant, and Northern Ireland has its own system.
Providers set technical requirements of their own, which can go further than Building Regulations in places. Which providers operate where can vary, so check early that yours covers your site.
The four nations have different rules and approvals. Structural engineers cover the whole UK, so the same designer can work to each nation’s rules.
Planning permission is a separate matter. In England and Wales, a new building on the boundary may also bring in the Party Wall etc. Act 1996, which doesn’t cover Scotland or Northern Ireland.

Questions people ask

Do I need a warranty on a new home?

No law requires one. Mortgage lenders and buyers commonly expect one on a new home, and self-builders often arrange one to help with future sales. Ask your lender early what they accept, because that decides which provider you use and which structural submissions you need.

How is a warranty provider different from building control?

Building control checks that your design and build meet Building Regulations, which is a legal requirement. A warranty provider offers cover for defects and uses its own technical standards and inspections. A new home needs building control whether or not it has a warranty. Some building control teams also offer warranties.

Why are trees such an issue for new foundations?

Tree roots draw water out of clay soil, which makes it shrink. When a tree is removed, the soil can swell back. Providers expect foundations to allow for this, so the species, height and distance of trees matter. Your engineer uses that information, with the soil type, to choose the depth and type of foundation.

Can the engineer deal with the provider’s technical team directly?

Often yes, once you have agreed it with the provider. That saves you relaying technical points back and forth. You remain the main contact for the project, and the engineer answers engineering queries and updates the design when needed.

Is an engineer’s structural certificate the same as a warranty?

No. A certificate is the engineer’s professional statement, based on the visits they made, that the structure was built in line with the design. A provider or lender may ask for one. A warranty is a separate product from the provider, and a certificate on its own doesn’t replace it.

Available across the UK

Professionals cover the whole of the UK: England, Scotland, Wales and Northern Ireland. Planning and Building Regulations differ between the four nations, and your professional will work to the rules that apply where your property is.