CNJ Construction Consultants

CNJ Construction Consultants

Know Your Build Costs Upfront

CNJ supports homeowners across Surrey, London, and the South East with construction cost advice, project planning, and professional support throughout residential building projects.
Our team supports clients with budgeting, feasibility reviews, project planning, tender support, and ongoing cost management throughout the construction process — helping reduce risk, avoid unexpected costs, and keep projects on track.
Cost Consultants for Homeowners

How CNJ Supports Homeowners

Before You Start Building

Helping homeowners understand budgets, feasibility, and construction costs before work begins.

Support Throughout Your Build

Project management, cost control, and professional support throughout the process.

Why Choose CNJ

Learn more about our experience supporting homeowners and residential construction projects.

Contact

Get expert advice for your extension, renovation, or residential project.

Associated With Professionals Across the Sector

Ashen Capital Logo in white
Clove Logo CNJ Construction Consultants
CDA Logo CNJ Construction Consultants
Cost Control for Homeowners
Who we are

Accurate Cost Advice,
Built Around You.

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.

What we offer

Our Services for Homeowners

Basic Cost Estimate

Get a quick, high-level overview of your project’s cost. Perfect for early feasibility and budget planning.

Detailed Cost Report

See exactly where your money would be going with a full cost breakdown, tailored to your project.

Tender Packages

We manage the tender process to vet contractors, handle queries and negotiate best and final quotations.

Reports in 2025
0
Value of projects for 2025
£ 0 m+
Company growth between 2024-2025
0 %
Your Trusted Cost Partner

Why Homeowners Trust CNJ

A Team That Responds

With 10+ staff, we’re big enough to move quickly — unlike one-person consultancies.

6 Years in Business

A proven track record helping homeowners plan and manage their projects.

50+ Years’ Experience

Expertise across surveying, construction, and project management under one roof.

Accurate & Honest

Our values guide every report and recommendation we provide.

Our Proven 3-Step Approach Gives You Clarity on Costs and Peace of Mind Throughout Your Build

Building work doesn’t have to be stressful. With CNJ, you’ll know your costs upfront and understand exactly where your money is going. Our 3-step approach gives you clear estimates, helps you choose the right builder with confidence, and keeps your project on track from start to finish.
Step 1: Share Your Plans
Send us your drawings or project details, and we’ll review where you’re at, whether it’s early sketches or full architect plans.
CNJ Sketches Construction Consultants
CNJ Calculator
Step 2: Get Your Cost Report

We'll prepare a full cost report, showing every detail of your project broken down and costed

Step 3: Tender & Build With Confidence
We work with you to build detailed tenders, vet contractors, and control costs throughout the build - give you peace of mind and protecting your budget.
CNJ Builders Work
Ready to Discuss Your Project?

01483 339 733

Call us directly, or share your details online and we’ll quickly assess the best way to help with your project

Homeowner Construction Consultancy FAQs

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.

Do homeowners need a construction consultant?

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.

Testimonials

Client Feedback & Reviews