Helping homeowners understand budgets, feasibility, and construction costs before work begins.
Project management, cost control, and professional support throughout the process.
Learn more about our experience supporting homeowners and residential construction projects.
Get expert advice for your extension, renovation, or residential project.
Our team of 11 brings over 50 years of combined experience in quantity surveying, project management, and construction.
We provide clear, accurate cost estimates and tender support that protect your budget, reduce risk, and keep your project on track — from the very first sketch through to completion.
Get a quick, high-level overview of your project’s cost. Perfect for early feasibility and budget planning.
See exactly where your money would be going with a full cost breakdown, tailored to your project.
We manage the tender process to vet contractors, handle queries and negotiate best and final quotations.
With 10+ staff, we’re big enough to move quickly — unlike one-person consultancies.
A proven track record helping homeowners plan and manage their projects.
Expertise across surveying, construction, and project management under one roof.
Our values guide every report and recommendation we provide.
We'll prepare a full cost report, showing every detail of your project broken down and costed
01483 339 733
Call us directly, or share your details online and we’ll quickly assess the best way to help with your project
Planning a residential building project can feel overwhelming, especially when it comes to budgets, project planning, and managing construction costs. Below are some of the most common questions homeowners ask before starting an extension, renovation, or residential development project.
Many homeowners seek professional advice before starting a building project to better understand budgets, timelines, and potential risks. A construction consultant can help provide clarity during the planning stage and support better decision-making throughout the project.
For homeowners planning a residential project, Before You Start Building can help provide early-stage cost advice and project guidance.
Yes. CNJ supports homeowners across Surrey, London, and the South East with professional construction consultancy services for extensions, renovations, loft conversions, and residential improvement projects.
Homeowners can explore both Before You Start Building and Support Throughout Your Build services, depending on the stage of their project.
Construction costs can quickly increase without proper planning and oversight. Clear budgeting, feasibility reviews, tender support, and ongoing cost management all help reduce the risk of unexpected expenses during a build.
CNJ provides homeowners with professional support through both the planning and delivery stages of residential projects via Support Throughout Your Build.
CNJ supports homeowners with construction cost advice, budgeting support, feasibility reviews, tender packages, project planning, and professional construction consultancy throughout residential projects.
You can learn more about the company and experience behind these services on the About CNJ page.
The earlier professional advice is sought, the easier it can be to plan realistic budgets and avoid unnecessary costs later in the project. Many homeowners seek support before appointing builders or finalising construction plans.
If you are planning an extension, renovation, or residential building project, you can Contact Our Team for tailored advice and support.
Professional construction cost advice helps homeowners better understand likely project costs before work begins. It can also support budgeting decisions, reduce financial risk, and improve cost control throughout the construction process.
CNJ helps clients make informed decisions through early-stage planning and ongoing construction cost management support.