★★★★★ "Would use again!"

Early-Stage Feasibility Estimates for Architects, Homeowners & Investors.

We help architects, homeowners, and investors set realistic budgets by providing early feasibility estimates and ongoing cost tracking, ensuring designs stay achievable and aligned with budget from concept through to completion.

Get Your Estimate
Get Your Estimate

Money Back Guarantee

Money Back Guarantee

"CORE made it so much easier to understand the cost of my extension before getting too far into it. They helped me tweak a few things so it actually fit my budget without losing the important bits. Honestly, saved me a lot of stress and money. Would definitely recommend to anyone planning an extension."

Stephen

Homeowner

There's a reason why we're trusted by architects across the UK!

Accurate cost planning at the start means better design decisions, fewer delays, and no nasty surprises when quotes come in.

Accurate cost planning at the start means better design decisions, fewer delays, and no nasty surprises when quotes come in.

Accurate cost planning at the start means better design decisions, fewer delays, and no nasty surprises when quotes come in.

Value Engineering

Our reports are baked into the design workflows of some of the UK’s best residential architects - because smart design starts with budget awareness.

Bespoke Estimates

Every estimate is built from scratch, based on your specific plans, location, and goals. No generic benchmarks or copy-paste pricing.

Unbiased

We’re not tied to the contractor or the designer, so you get honest, objective advice on what things should cost – not what someone wants them to cost.

Jargon Free

We strip out the technical nonsense and give you clear, easy-to-follow cost reports that make sense, even if you’re not from the trade.

Upfront Clarity

We give you a detailed breakdown of what your project is likely to cost before you commit to planning or design - so you’re not flying blind.

Variation Verification

We review every change, making sure contractors don’t sneak in inflated prices or charge for work that isn’t a genuine variation.

Here's how it works

Send Us What You’ve Got

We’ll need CAD-drawn concept plans (nothing overly detailed, just something scalable), along with a rough idea of your vision for the project. Don’t worry if you’re not sure about everything — we have a document that can help guide you through outlining your vision, so we can capture your ideas and intentions clearly.

Send Us Your Plans
Send Us Your Plans

Send Us What You’ve Got

We’ll need CAD-drawn concept plans (nothing overly detailed, just something scalable), along with a rough idea of your vision for the project. Don’t worry if you’re not sure about everything — we have a document that can help guide you through outlining your vision, so we can capture your ideas and intentions clearly.

Send Us Your Plans
Send Us Your Plans

Send Us What You’ve Got

We’ll need CAD-drawn concept plans (nothing overly detailed, just something scalable), along with a rough idea of your vision for the project. Don’t worry if you’re not sure about everything — we have a document that can help guide you through outlining your vision, so we can capture your ideas and intentions clearly.

Send Us Your Plans
Send Us Your Plans

Quick Discovery Call (If Necessary)

If we need further clarification on your vision or project scope, we’ll set up a 15–20 minute call. We’ll go over key details like your goals, budget, site-specific challenges, and any other critical elements that’ll help us provide an accurate estimate.

Quick Discovery Call (If Necessary)

If we need further clarification on your vision or project scope, we’ll set up a 15–20 minute call. We’ll go over key details like your goals, budget, site-specific challenges, and any other critical elements that’ll help us provide an accurate estimate.

Quick Discovery Call (If Necessary)

If we need further clarification on your vision or project scope, we’ll set up a 15–20 minute call. We’ll go over key details like your goals, budget, site-specific challenges, and any other critical elements that’ll help us provide an accurate estimate.

We Build the Estimate

We create a detailed, line-by-line estimate based on your drawings, goals, and location. This includes all major build costs and prelims like project management, scaffolding, welfare, and site setup - the real-world stuff most people overlook.

We Build the Estimate

We create a detailed, line-by-line estimate based on your drawings, goals, and location. This includes all major build costs and prelims like project management, scaffolding, welfare, and site setup - the real-world stuff most people overlook.

We Build the Estimate

We create a detailed, line-by-line estimate based on your drawings, goals, and location. This includes all major build costs and prelims like project management, scaffolding, welfare, and site setup - the real-world stuff most people overlook.

You Get the Report

You’ll receive a structured PDF with a full breakdown of costs, commentary, and totals. It’s written in plain English and ready to share with architects, builders, or planning consultants.

You Get the Report

You’ll receive a structured PDF with a full breakdown of costs, commentary, and totals. It’s written in plain English and ready to share with architects, builders, or planning consultants.

You Get the Report

You’ll receive a structured PDF with a full breakdown of costs, commentary, and totals. It’s written in plain English and ready to share with architects, builders, or planning consultants.

Review & Revise If Needed

Once you’ve had a chance to look through the estimate, we’re happy to jump on a call to walk you through it and answer any questions. If something needs adjusting - whether it’s scope, spec, or just exploring options - that’s no issue. One round of revisions is included to make sure you’ve got an accurate, up-to-date cost plan that reflects your project properly.

Review & Revise If Needed

Once you’ve had a chance to look through the estimate, we’re happy to jump on a call to walk you through it and answer any questions. If something needs adjusting - whether it’s scope, spec, or just exploring options - that’s no issue. One round of revisions is included to make sure you’ve got an accurate, up-to-date cost plan that reflects your project properly.

Review & Revise If Needed

Once you’ve had a chance to look through the estimate, we’re happy to jump on a call to walk you through it and answer any questions. If something needs adjusting - whether it’s scope, spec, or just exploring options - that’s no issue. One round of revisions is included to make sure you’ve got an accurate, up-to-date cost plan that reflects your project properly.

Move Forward with Certainty

Armed with real numbers and nothing hidden, you’re in a strong position to progress. Whether it’s refining the design, budgeting properly, or speaking to contractors, you’ll know exactly what you’re getting into.

Send Us Your Plans
Send Us Your Plans

Move Forward with Certainty

Armed with real numbers and nothing hidden, you’re in a strong position to progress. Whether it’s refining the design, budgeting properly, or speaking to contractors, you’ll know exactly what you’re getting into.

Send Us Your Plans
Send Us Your Plans

Move Forward with Certainty

Armed with real numbers and nothing hidden, you’re in a strong position to progress. Whether it’s refining the design, budgeting properly, or speaking to contractors, you’ll know exactly what you’re getting into.

'We had no idea what our budget could actually get us, and we didn’t want to waste time designing something we couldn’t afford. Core made the whole process clear from the start. They gave us a proper breakdown of what was realistic, which helped us make decisions with confidence. No upselling, no fluff - just honest advice and solid numbers. Would definitely recommend them if you're trying to get a handle on costs early."

'We had no idea what our budget could actually get us, and we didn’t want to waste time designing something we couldn’t afford. Core made the whole process clear from the start. They gave us a proper breakdown of what was realistic, which helped us make decisions with confidence. No upselling, no fluff - just honest advice and solid numbers. Would definitely recommend them if you're trying to get a handle on costs early."

'We had no idea what our budget could actually get us, and we didn’t want to waste time designing something we couldn’t afford. Core made the whole process clear from the start. They gave us a proper breakdown of what was realistic, which helped us make decisions with confidence. No upselling, no fluff - just honest advice and solid numbers. Would definitely recommend them if you're trying to get a handle on costs early."

Liz Garner

Liz Garner

Liz Garner

Homeowner

Homeowner

Homeowner

Our Packages

Pick the support you need - whether it’s a one-off feasibility study or ongoing expert input throughout your project.

Monthly Consultations

For clients who want expert cost guidance throughout the construction phase.

£62.50

Per Month

What's included:

Ongoing monthly check-ins

Ongoing monthly check-ins

Ongoing monthly check-ins

Advice on pricing variations, contractor quotes, and change orders

Advice on pricing variations, contractor quotes, and change orders

Advice on pricing variations, contractor quotes, and change orders

Help managing scope creep and cost control in real time

Help managing scope creep and cost control in real time

Help managing scope creep and cost control in real time

Independent support

Independent support

Independent support

Help Me Save

Help Me Save

Help Me Save

Help Me Save

Help Me Save

Help Me Save

Feasibility Cost Estimate

For homeowners and architects who want clarity before committing to design.

£125

From*

What's included:

Full cost estimate based on your concept drawings and goals

Full cost estimate based on your concept drawings and goals

Full cost estimate based on your concept drawings and goals

Ready in 3–5 working days

Ready in 3–5 working days

Ready in 3–5 working days

Built for sharing with architects, planners, or contractors

Built for sharing with architects, planners, or contractors

Built for sharing with architects, planners, or contractors

Video Consultation

Video Consultation

Video Consultation

Get Your Estimate

Get Your Estimate

Get Your Estimate

Get Your Estimate

Get Your Estimate

Get Your Estimate

*If we can’t deliver a clear, structured feasibility estimate based on the info you give us, we’ll refund you in full.*

Hi 👋 I'm Sam - Founder @ CORE.

Time and time again, we see clients excited to bring their vision to life, only to be blindsided when the quotes come back way over budget. Builders often don’t have the time or resources to sit down and rework designs with you, and architects, while talented, aren’t always up to date with rapidly rising construction costs.

By getting involved early in the process, we help homeowners and architects design with real-world costs in mind. We provide clear, accurate feasibility cost studies at the start - so you can plan confidently, avoid costly surprises, and make informed decisions from day one. With our ongoing monthly consultations, you can further reduce risk of unnecessary variations and unexpected costs.

Frequently Asked Questions

Some answers to some frequently asked questions.

What is a feasibility estimate, and why do I need one?

A feasibility estimate helps you set realistic budget expectations before you start planning or designing your project. It ensures that your project stays on track financially and helps you make adjustments early if needed.

Can you provide estimates without any drawings?

No - we need at least basic CAD drawings that are to scale. If you don’t have those yet, we can point you in the right direction, but we don’t guess or work off vague sketches. Accurate inputs = accurate outputs.

How accurate are your estimates

Our estimates are based on our extensive experience in the industry, and while we use close guesses for some elements like electrical, plumbing, and windows, we strive to provide as accurate a budget as possible based on the available information.

What happens if my project exceeds the estimated budget?

If your project comes in over budget, we offer cost engineering solutions - using our construction expertise to suggest cost-effective alternatives that align with your design goals, ensuring your project stays within budget.

Will I need a site visit?

No, a site visit isn’t necessary. We can provide accurate estimates based on your architectural drawings, specifications, and project details. If additional information is needed, we’ll discuss it with you or your architect to ensure we have everything required to produce a reliable estimate. However, if a site visit is ever beneficial for a particularly complex project, we can discuss that option.


How will I save money?

We deliver feasibility studies before you spend thousands on detailed building regulation drawings. If your project’s over budget, you’ll catch it early - not after paying for plans that need reworking. On average, our clients save over 5x our fee in avoided redesign costs by staying within budget from day one.

When it’s time to get contractor quotes, you’ll already have clear cost expectations - making it much harder to get overcharged or misled. And during the build, our monthly cost consultations help keep contractors in check, ensuring variations are legitimate and you’re only paying for work that’s actually been done.

What is a feasibility estimate, and why do I need one?

A feasibility estimate helps you set realistic budget expectations before you start planning or designing your project. It ensures that your project stays on track financially and helps you make adjustments early if needed.

Can you provide estimates without any drawings?

No - we need at least basic CAD drawings that are to scale. If you don’t have those yet, we can point you in the right direction, but we don’t guess or work off vague sketches. Accurate inputs = accurate outputs.

How accurate are your estimates

Our estimates are based on our extensive experience in the industry, and while we use close guesses for some elements like electrical, plumbing, and windows, we strive to provide as accurate a budget as possible based on the available information.

What happens if my project exceeds the estimated budget?

If your project comes in over budget, we offer cost engineering solutions - using our construction expertise to suggest cost-effective alternatives that align with your design goals, ensuring your project stays within budget.

Will I need a site visit?

No, a site visit isn’t necessary. We can provide accurate estimates based on your architectural drawings, specifications, and project details. If additional information is needed, we’ll discuss it with you or your architect to ensure we have everything required to produce a reliable estimate. However, if a site visit is ever beneficial for a particularly complex project, we can discuss that option.


How will I save money?

We deliver feasibility studies before you spend thousands on detailed building regulation drawings. If your project’s over budget, you’ll catch it early - not after paying for plans that need reworking. On average, our clients save over 5x our fee in avoided redesign costs by staying within budget from day one.

When it’s time to get contractor quotes, you’ll already have clear cost expectations - making it much harder to get overcharged or misled. And during the build, our monthly cost consultations help keep contractors in check, ensuring variations are legitimate and you’re only paying for work that’s actually been done.

What is a feasibility estimate, and why do I need one?

A feasibility estimate helps you set realistic budget expectations before you start planning or designing your project. It ensures that your project stays on track financially and helps you make adjustments early if needed.

Can you provide estimates without any drawings?

No - we need at least basic CAD drawings that are to scale. If you don’t have those yet, we can point you in the right direction, but we don’t guess or work off vague sketches. Accurate inputs = accurate outputs.

How accurate are your estimates

Our estimates are based on our extensive experience in the industry, and while we use close guesses for some elements like electrical, plumbing, and windows, we strive to provide as accurate a budget as possible based on the available information.

What happens if my project exceeds the estimated budget?

If your project comes in over budget, we offer cost engineering solutions - using our construction expertise to suggest cost-effective alternatives that align with your design goals, ensuring your project stays within budget.

Will I need a site visit?

No, a site visit isn’t necessary. We can provide accurate estimates based on your architectural drawings, specifications, and project details. If additional information is needed, we’ll discuss it with you or your architect to ensure we have everything required to produce a reliable estimate. However, if a site visit is ever beneficial for a particularly complex project, we can discuss that option.


How will I save money?

We deliver feasibility studies before you spend thousands on detailed building regulation drawings. If your project’s over budget, you’ll catch it early - not after paying for plans that need reworking. On average, our clients save over 5x our fee in avoided redesign costs by staying within budget from day one.

When it’s time to get contractor quotes, you’ll already have clear cost expectations - making it much harder to get overcharged or misled. And during the build, our monthly cost consultations help keep contractors in check, ensuring variations are legitimate and you’re only paying for work that’s actually been done.

Contact

Contact our team

Contact our team

Fill out the form to contact our team.

Fill out the form to contact our team.