FIND THE POTENTIAL
Surrey country village surrounded by wooded countryside

Find the potential.
See the evidence.

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PLANNING

Planning history
Previous applications
Refusals
Withdrawals
Nearby approvals
Extension precedent
New dwelling precedent
Local constraints

PURCHASE COSTS

Purchase price
SDLT
Legal fees
Survey costs
Acquisition costs
Finance costs
Holding costs
Exit costs

BUILD & REFURB

Existing floor area
Proposed floor area
Added floor area
Refurb cost
Extension cost
Build cost / sq ft
Site works
Contingency

VALUE & EVIDENCE

Same-road sold evidence
Nearby sold comparables
Sold prices
Comparable floor areas
£ / sq ft
Finished value / GDV
GDV confidence
Current asking evidence

PROFIT & RISK

Total development cost
Potential profit
Profit on cost
Profit margin
Sensitivity
Key risks
Exit strategy
Developer verdict

CACHED FULL UNDERWRITE EXAMPLE

From tired bungalow to finished value

A straightforward refurbishment with a separate extension option, tested against measured same-road evidence.

REFURB + POSSIBLE EXTENSION

Tynley Grove, Jacobs Well, Guildford

Three-bedroom detached bungalow requiring modernisation

64/100 · AMBER
EXISTING FLOOR AREA904 sq ft verifiedWORKING EXTENSION CASE1,050 sq ft proposed

Added area: 146 sq ft. Existing area is stated in the live particulars. The proposed area is a working appraisal assumption and must be replaced by a measured design.

PURCHASE£450k ask / £375k targetTOTAL COST£523k refurb / £580k extendEST. GDV£570–600k / £630–650kEST. PROFIT£48–78k / £50–70kMARGIN ON GDV8–13% / 8–11%

Our take

The 904 sq ft bungalow is real, measurable and straightforward to understand. A good refurbishment should move it towards the strongest same-road bungalow evidence. A modest rear extension could take it to roughly 1,050 sq ft, but the extra spend only works if the purchase price comes down.

Refurbishment case

Target purchase £375,000. SDLT £8,750 · Legal and survey £5,000 · Refurbishment £90,000 (about £100/existing sq ft) · Finance and holding £25,000 · Selling and exit £19,000. Total cost £522,750. Refurb GDV £570,000–£600,000, giving a working profit of £47,250–£77,250.

Extension case

Start with the same £90,000 refurbishment. Add 146 sq ft at £250/sq ft (£36,500), plus £15,000 for design, approvals and contingency. Allow £30,000 finance/holding and £20,000 selling/exit. Total cost about £580,250. At £630,000–£650,000 GDV, working profit is £49,750–£69,750.

Comparable floor-area evidence

SAME ROAD — SOLD
7 Tynley Grove · £570,000 · Jan 2025 · 915 sq ft · £623/sq ft

CURRENT ASKING — NOT SOLD
Improved Tynley Grove bungalow · £599,950 · 1,001 sq ft · £599/sq ft · loft permission

CURRENT ASKING — NOT SOLD
Newly refurbished and extended Jacobs Well bungalow · £650,000 · 1,036 sq ft · £627/sq ft

GDV and £/sq ft evidence

The refurb case uses roughly £631–£664 per sq ft on 904 sq ft. The extension case uses £600–£619 per sq ft on 1,050 sq ft. Those ranges sit close to the measured local evidence rather than relying on a blanket area average.

THE FIND THE POTENTIAL ANALYSIS

What we add to every original listing.

We do not repeat an agent advert. We turn it into a developer decision screen.

WHY IT SURFACED

Condition, price gap, plot, odd building, planning trail, access or a mismatch between the asset and its road.

ROUTE TO VALUE

Refurb, loft, extension, replacement, split, conversion, backland or change of use — clearly marked STPP where needed.

FINISHED EVIDENCE

Existing size, plausible finished size, relevant sold comparables and the key GDV question.

CORE UNDERWRITING

Purchase price, refurb or build allowance, finished value and estimated project profit. Other costs stay optional.

DEAL BREAKERS

Planning uncertainty, title and access, abnormal costs, services, flood, structural risk and weak resale evidence.

ORIGINAL SOURCE

Short neutral Find the Potential summary, then a direct link back to the agent, auctioneer or portal listing.

PROPERTY INTELLIGENCE

Articles for people building value.

Practical development notes, underwriting principles and routes to opportunity.

Buy-in

How to spot the price gap before you offer

What the price today says before you even cost the works.

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Strategy

Refurb, extend or replace? Choose the route first

The value-add route that makes the numbers work — and the one to leave alone.

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Comparable sales

Finished comparables: the evidence behind the GDV

How we test the finished value against real nearby sales, not wishful thinking.

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