Please use the calculator below to calculate the cost of your building work.
CALCULATOR





How to calculate the cost of your extension.
A basic builder's estimate would be based around £1,800-£2,500 per m2 this would include plant, labour and material, which would be to a builders finish. 

What will your Extension cost? (guide price only) 
The best way to work out the cost of your extension, is to figure out the floor area, which is the length multiplied by the width, use the calculator on the left to help you.

Once you have your area, multiply that by £1,800.00 then multiply that by VAT at 
20%, then add them figures together that will give you a final figure.

For example: 
A 5m x 5m extension.
The floor area will be 5 x 5 =25m2 
X £1,800.00 =£45,000.00
X 20% VAT =£9,000.00
Add those figures together 
£45,000.00 + £9,000.00 =£54,000.00

This would be a rough guide price for the cost of your extension, there are lots of factors to take into account, e.g. foundation type.

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What our standard quotes include. 

Contact us today for a quote that fits your requirements. 

Free accessible CCTV coverage ✔ The supply or fitting of stud walls. ✔
Free professionally cleaned driveway. ✔ Plaster finish to walls and ceilings. ✔
Foundations 1.3m x 0.6m – Piled or deeper foundation price may change. ✔ Radiators BTU calculated, including flow and return pipes. ✔
Block and beam floor / concrete slab. ✔ Electrics: double sockets, light switches, pendant/ downlights, extractor fan. ✔
Screed finish to match existing levels ✔ Supply and fitting of new internal doors to new extension. ✔
Supply and fit of new pitched/ flat roof. ✔ Supply and fitting of new internal doors, skirting and architraves. ✔
New fascias and soffits. ✔ Supply of scaffolding, skips & Temporary toilet. ✔
New gutter runs & down pipes. ✔ 5 Year Warranty certificate ✔
Please take into consideration:
 You may require additional items, such as fitted kitchen / Bathroom, Velux windows, bi-folding doors, steel beams, additional electrics, etc.
if you do require additional items, then this will be added onto your guide price.
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How We Quote & What’s Included

If you don’t have an electrical layout, we’ll pass your plans to our qualified electrician, who will recommend the number and placement of electrical fittings to suit your space. You’re free to add or remove sockets and switches as you wish, ensuring the final design meets your needs.

Ready for a free, fixed quote for your building project?
Simply call us on 01268 416040 or email info@paulbailey.info.
  • Have drawings? Send them over and we’ll provide a detailed, fixed-price quote.
  • No drawings yet? No problem—just book a free site visit. We’ll discuss your project in detail, then our estimating team will prepare a comprehensive, fixed quote tailored to your requirements. 
All building works are carried out in full compliance with building control regulations. On completion, we ensure all building materials and debris are removed and disposed of, leaving your site clean and tidy.

For your peace of mind, every project can be covered by CCTV for added safety and security. The system remains yours, free of charge, once the work is complete. If you’d like additional cameras, we can provide these at cost.
Please visit us on the following sites by clicking on the images:


We would recommend reading the guide, before you choose your builder.
VIEW GUIDE

How to find the right builder for your project?

 

The success of any building project starts with choosing the right builder. But anyone in a van can offer a building service, so it’s essential to do your research first. There are a lot of cowboy builders out there, so taking the time to check credentials and experience will protect your investment and your peace of mind.


Choosing the right builder is one of the most important decisions you'll make when planning a home extension, loft conversion, or renovation. The right team can turn your vision into reality and make the process smooth and stress-free.


Here’s what to consider when selecting a builder for your project:

 1. Check Credentials and Experience 

Look for builders who are members of recognised trade bodies (like the Federation of Master Builders) and have a proven track  record. Ask how long they’ve been in business and request examples of similar projects they’ve completed.

 2. Rear Reviews and Testimonials

Independent reviews on platforms like Checkatrade or Google can give you insight into a builder’s reliability, quality of work, and customer service. Don’t hesitate to ask for references you can contact directly.


3. Review Their Portfolio

A reputable builder should have a portfolio of past work. Reviewing before-and-after photos, case studies, or visiting completed projects can help you judge their craftsmanship.

4. Get Detailed Quotes

Request a clear, itemised quote that outlines exactly what’s included. This should cover all aspects of the build, from materials and labour to timelines and payment schedules. Be wary of vague or unusually low estimates.

4. Check Insurance and Guarantees. 

Ensure your builder has up-to-date public liability insurance and offers a written guarantee on their work. This protects you in case of accidents or defects after completion

5. Communication and Transparency

Choose a builder who communicates clearly, listens to your needs, and keeps you updated throughout the project. Good communication can prevent misunderstandings and delays.

7.  Trust Your Instincts

Finally, trust your gut. You should feel comfortable and confident with your builder, after all, you’ll be working closely together for several weeks or months.

Comparing Quotes – What to Look For

When comparing quotes for your building project, it’s crucial to ensure you’re getting exactly what you’ve asked for and what’s required on your drawings. Always look out for hidden extras, and remember—the cheapest quote isn’t always the best value.

 Get at least three written quotes (not estimates).

Ask for each quote to be broken down in detail so you can clearly see what you’re paying for.

Check what’s included.

Does the quote cover scaffolding, skip hire, site clearance, and all necessary works? Make sure nothing important is missing.

Confirm if VAT is included.

Make sure the quoted price is inclusive of VAT to avoid surprises later.

Understand the payment schedule.

Never pay large upfront costs! Our payment terms are simple: you’re invoiced after each stage is completed and passed by local authority building control—giving you total peace of mind.

Need help finding a local architect or structural engineer? Contact us for recommendations.

Will you need planning permission? Visit the Planning Portal for guidance.

Contact us today.

Address:  Unit 16 Ilford Trading Estate
                  Basildon
                  Essex
                  SS14 3DR

Mail: info@paulbailey.info

Office:  01277 532991
01268 416040

Business Hours

Mon - Fri
-
Sat - Sun
Closed
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HELPFUL HINTS AND TIPS
We know there is a lot to think about now we are starting your build. Here are a 10 helpful Tips to think about.
Please note: We will drop off all broaches and samples for you to choose from. 

01 Roof Coverings. 

- Select the roof tiles you would like. 
-  Select the colour of flat roof finish you       would like. 

02. External.

- Select Bricks. 
- Select silicone Render colour from render chart. 
- Select window colour and design
- Select Facia and soffit and guttering colour.

03 Electrics.

- Lighting Pendants or downlights. 
- Colour of faceplates Chrome/brass/ or standard white. 
- Location of all your electrics. 
- PLEASE SEE  OUR ELECTRICAL PRICE SHEET. 

04 Kitchens

Book in a meeting with your chosen kitchen company to Design, quote and supply your kitchen.
We recommend Howdens or Benchmarx. 


05. Bathroom.

- Select your bathroom suite including, shower, shower tray, shower surrounds, bath, basin, taps, toilet, towel rails.
We recommend SX Heating or connect plumbing. 

06 Radiators. 

We supply standard radiators only. - If designer radiator or towel rail is required, then we recommend buying these from SX Heating or Screwfix


07 Carpentry finishes.

- Select your doors.
- Select your skirting and architrave.
- Select your door handles and locks.  
These can be found in the Howdens broacher. 



08. Tiling 

- Select your tiles.
- Select a colour on what grout you would like.
- Select the pattern of your tiling.
We recommend Tops tiles. 


09 Floor finishes.

- Select what floor you would like e.g. Tiled, wood, vinyl, Carpet. 


10 Painting & Decorating. 

Select and supply colours (we supply white paint only).

Don't just take our word for it, References can be provided upon request