21 Granville Avenue, Seaton Sluice, Whitley Bay, NE26 4BU
About 21 Granville Avenue
21 Granville Avenue is a three-bedroom semi-detached house in Seaton Sluice, Whitley Bay, Whitley Bay (NE26 4BU). It has a recorded floor area of 101 m² (around 1087 sq ft), construction records dating it to 1967-1975 and council tax band C. The latest certificate (April 2024) shows a C (score 70). When first surveyed in April 2010 the rating was D, the property has climbed 1 band since. Between certificates, roof efficiency went from Poor to Good, window efficiency went from Average to Good and lighting went from Good to Very Good; while hot-water efficiency dropped from Very Good to Good and main heating dropped from Very Good to Good. The recommended improvements would push it to B (score 83).
2 planning records sit against the property, 2 approved, 0 refused. Past consents include an extension, meaningful when judging how the property has evolved. Across 2011–2024, sale prices on this property compounded at 4.7% per year. Today's modelled estimate of £318,000 is 11% above the 2024 sale price. On a £-per-square-foot basis, the last sale (£264/sq ft) was about 62.1% above the typical sold price in the postcode. Most recent transfer: September 2024 at £286,500.
Know exactly what you're buying at 21 Granville Avenue
Before you offer, see what the listing won't tell you, the true value, the red flags and the full history.
Valuation
against the asking price
Risks
planning & flood
Sold prices
similar homes nearby
Trends
the local market
What this property has
Inside
- Bedrooms3
- Bathrooms1
- Dining roomYes
- Utility roomYes
- CloakroomYes
- EnsuiteYes
- FireplaceYes
Outside
- Private gardenWest-facing
- GarageYes
Energy performance
EPC Rating
Property Improvements
Changes detected from historical EPC data
Heating controls upgraded for better temperature management
Hot water efficiency decreased
Window efficiency improved
Wall insulation upgraded
Loft insulation installed or upgraded to 250mm+
More low energy lighting installed
Planning history
- Feb 2021ExtensionAmendmentIn report
Non-material amendment relating to planning permission 20/01557/FUL to allow the extension to side to be extended by 850mm, first floor window above garage to become a bay window, introduce a canopy over the garage and front door, change windows to the porch, 1No. rear dormer removed and driveway widened to provide additional parking
- Agent
- Neil Armour Architectural Services
- Documents
- 9 docs on file
- Reference
- 21/00004/NONMAT
- Jul 2020ExtensionFullIn report
Extension: Single storey · Side and rear of property
Construction of first floor side/rear extension and No. 2 attic rooms with rear dormer windows (amended site plans received 18/06/2020)
- Documents
- 9 docs on file
- Reference
- 20/01557/FUL
What's in 21 Granville Avenue, Seaton Sluice, Whitley Bay, NE26 4BU's planning history?
Refusals, disputes and full decisions on this property and nearby, in the report.
Sales history & valuation
21 Granville Avenue valuation sits well clear of the typical sold price in this postcode.
£318,000
Modelled from EPC, postcode comparables and a sale-price growth of 4.7% per year over 13 years.
£286,500
Growth on file: 4.7% per year over 13 years.
Sales timeline
11 September 2024Most recent
£286,500
+84.8%over 13 years27 April 2011
£155,000
Median price across the last 5 sales in NE26 4BU: £250,000 (2025–2019).
Nearby sales in NE26 4BU
11 Granville Avenue, Seaton Sluice, Whitley Bay, NE26 4BU
Sold Aug 2025
£360,0009 Granville Avenue, Seaton Sluice, Whitley Bay, NE26 4BU
Sold May 2024
£295,0005 Granville Avenue, Seaton Sluice, Whitley Bay, NE26 4BU
Sold Aug 2019
£210,00013 Granville Avenue, Seaton Sluice, Whitley Bay, NE26 4BU
Sold Jan 2019
£185,0007 Granville Avenue, Seaton Sluice, Whitley Bay, NE26 4BU
Sold Apr 2018
£247,500
Everything we know about 21 Granville Avenue, in one report
What it's really worth, what could be wrong, and the planning, sales and area data in full.
- Am I paying too much?
- Is something wrong with it?
- Is the agent's story true?
- Will it hold its value?

Versus other Granville Avenue homes
CO₂ Emissions for 21 Granville Avenue runs comfortably ahead of the street norm.
Price per m²
£2,837
Street avg £2,251
Floor Area
101 m²
Street avg 114 m²
Habitable Rooms
5 rooms
Street avg 5 rooms
CO₂ Emissions
3.5 t/year
Street avg 4.8 t/year
Similar properties nearby
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1 Clarence Street, Seaton Sluice
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The neighbourhood at a glance
Daytime road noise here sits well below conversation level — a quiet pocket of the postcode.
Crime
2/mo
Steady year-on-year across the wider district.
Nearest stop
0.1 km
Hartley Square — bus stop.
Closest school
0.1 km
Seaton Sluice First School. 4 schools nearby.
Go deeper on the local area
The full report breaks down crime, transport links, schools and air quality in depth.
Road noise across the postcode

Daytime· 07:00 – 23:00
48.3dB

Night-time· 23:00 – 07:00
40.4dB