Convent Road Ashford, Spelthorne
168 addresses across 7 postcodes (TW15), about 930 m (0.6 miles) long, classed as a b road. USRN 37200236.
- Sales: 145 recorded sales since 1995; in 2023 the median was £425,000 across 5 sales.
- Energy: 111 homes have an energy certificate (B: 6, C: 52, D: 47, E: 6).
- Flood: 6 addresses on its postcodes are in areas at high or medium risk of flooding from rivers, the sea or surface water.
- Council tax: Most homes around it are in council tax band D; Band D in Spelthorne costs £2,526 a year in 2026-27.
- Broadband: Gigabit broadband is available to 89% to 100% of premises.
- Transport: The nearest railway station is Ashford (Surrey), about 1.2 km (0.8 miles) away in a straight line.
- Green space: The nearest park or garden is about 850 m (0.5 miles) away.
- Air: Background air pollution in 2024 was 15.2 µg/m³ of nitrogen dioxide and 7.8 of PM2.5, within UK legal limits.
- Height: It is about 14 m above sea level.
- Noise: 140 of its 168 addresses are modelled at 55 dB or more from road traffic.
- Doctors: The nearest GP surgery is The Orchard Surgery, about 200 m away, with 4 practices within 1.6 km (1 mile).
- People: About 1,370 people lived in the census areas around it in 2021; 45% of households owned their home and 23% of adults held a degree or other higher qualification.
- Crime: 135 crimes were recorded within 250 m between September 2025 and August 2026, most often violence and sexual offences.
Sales on this street
| Year | Sales | Median price | Lowest | Highest |
|---|---|---|---|---|
| 2023 | 5 | £425,000 | £280,000 | £575,000 |
| 2022 | 2 | £385,500 | £286,000 | £485,000 |
| 2021 | 1 | £500,000 | £500,000 | £500,000 |
| 2020 | 2 | £401,250 | £362,500 | £440,000 |
| 2019 | 4 | £348,750 | £167,500 | £455,000 |
| 2018 | 2 | £422,500 | £420,000 | £425,000 |
| 2017 | 2 | £327,500 | £270,000 | £385,000 |
| 2016 | 5 | £325,000 | £210,000 | £415,000 |
| 2015 | 4 | £300,000 | £249,950 | £365,000 |
| 2014 | 4 | £266,500 | £197,000 | £334,950 |
| 2013 | 5 | £236,950 | £165,000 | £330,000 |
| 2012 | 3 | £240,000 | £125,000 | £270,000 |
| Date | Address | Type | Price | Notes |
|---|---|---|---|---|
| 30 Apr 2024 | THE ASH TREE TW15 2HW | Other | £1,500,000 | Not a standard sale (repossession, buy-to-let or transfer). |
| 24 Nov 2023 | 86 TW15 2EL | Semi-detached | £425,000 | |
| 11 Oct 2023 | 76 TW15 2EL | Semi-detached | £520,000 | |
| 29 Sep 2023 | 65 TW15 2HN | Flat or maisonette | £315,000 | Leasehold. |
| 31 Mar 2023 | 44 TW15 2EL | Flat or maisonette | £280,000 | Leasehold. |
| 9 Feb 2023 | 4 TW15 2EW | Terraced | £575,000 | |
| 7 Oct 2022 | 25 TW15 2HJ | Detached | £485,000 | |
| 26 Aug 2022 | FLAT 2, BEAUFORT HOUSE TW15 2HU | Flat or maisonette | £286,000 | Leasehold. |
| 26 Aug 2021 | 71 TW15 2HN | Other | £280,000 | Leasehold. Not a standard sale (repossession, buy-to-let or transfer). |
| 12 Mar 2021 | 106 TW15 2EL | Semi-detached | £500,000 | |
| 11 Dec 2020 | 21 TW15 2HJ | Semi-detached | £362,500 | |
| 30 Nov 2020 | 47 TW15 2HN | Semi-detached | £440,000 | |
| 26 Nov 2019 | 22 TW15 2EW | Flat or maisonette | £320,000 | Leasehold. |
| 4 Nov 2019 | 27 TW15 2HJ | Terraced | £377,500 | |
| 29 Aug 2019 | 79 TW15 2HN | Flat or maisonette | £167,500 | Leasehold. |
| 5 Feb 2019 | 45 TW15 2HN | Semi-detached | £455,000 | |
| 21 Aug 2018 | 49 TW15 2HN | Terraced | £425,000 | |
| 29 Mar 2018 | 65 TW15 2HN | Flat or maisonette | £290,000 | Leasehold. Not a standard sale (repossession, buy-to-let or transfer). |
| 9 Feb 2018 | 72 TW15 2EL | Terraced | £420,000 | |
| 14 Jul 2017 | 43 TW15 2HJ | Semi-detached | £385,000 | |
| 5 Jun 2017 | FLAT 3, BEAUFORT HOUSE TW15 2HU | Flat or maisonette | £270,000 | Leasehold. |
| 5 Dec 2016 | 50 TW15 2EL | Flat or maisonette | £325,000 | Leasehold. |
| 30 Sep 2016 | 113 TW15 2HW | Semi-detached | £370,000 | |
| 27 Sep 2016 | 94 TW15 2EL | Semi-detached | £415,000 | |
| 18 Mar 2016 | 75 TW15 2HN | Flat or maisonette | £210,000 | Leasehold. |
| 19 Feb 2016 | 69 TW15 2HN | Flat or maisonette | £242,800 | Leasehold. |
| 11 Nov 2015 | FLAT 12, BEAUFORT HOUSE TW15 2HU | Flat or maisonette | £265,000 | Leasehold. |
| 18 Sep 2015 | 67 TW15 2HN | Flat or maisonette | £249,950 | Leasehold. |
| 17 Aug 2015 | 31 TW15 2HJ | Terraced | £365,000 | |
| 1 Jun 2015 | 17 TW15 2HJ | Terraced | £335,000 | |
| 10 Oct 2014 | 44 TW15 2EL | Flat or maisonette | £235,000 | Leasehold. |
| 28 Mar 2014 | 71 TW15 2HN | Flat or maisonette | £197,000 | Leasehold. |
| 21 Jan 2014 | 35A TW15 2HJ | Detached | £334,950 | |
| 17 Jan 2014 | 72 TW15 2EL | Terraced | £298,000 | |
| 3 Dec 2013 | 62 TW15 2EL | Flat or maisonette | £165,000 | Leasehold. |
| 25 Oct 2013 | 43 TW15 2HJ | Semi-detached | £240,000 | |
| 29 Jul 2013 | 41 TW15 2HJ | Semi-detached | £330,000 | |
| 10 May 2013 | 87 TW15 2HW | Flat or maisonette | £172,500 | Leasehold. |
| 30 Jan 2013 | 92 TW15 2EL | Semi-detached | £236,950 | |
| 7 Sep 2012 | 104 TW15 2EL | Semi-detached | £270,000 | |
| 16 Mar 2012 | 88 TW15 2EL | Terraced | £240,000 | |
| 20 Jan 2012 | 75 TW15 2HN | Flat or maisonette | £125,000 | Leasehold. |
| 5 Sep 2011 | 44 TW15 2EL | Flat or maisonette | £180,000 | Leasehold. |
| 15 Jul 2011 | 84 TW15 2EL | Semi-detached | £210,000 | |
| 1 Nov 2010 | 41 TW15 2HJ | Semi-detached | £300,000 | |
| 30 Sep 2010 | 17 TW15 2HJ | Detached | £240,000 | |
| 4 Jun 2010 | 22 TW15 2EW | Flat or maisonette | £210,000 | Leasehold. |
| 14 Oct 2009 | 41 TW15 2HJ | Semi-detached | £203,000 | |
| 6 Aug 2009 | 73 TW15 2HN | Flat or maisonette | £174,000 | Leasehold. |
| 3 Jul 2009 | 98 TW15 2EL | Semi-detached | £250,000 |
Energy performance certificates
111 homes with a current certificate; median floor area 77 m². Most common: Flat (62); House, semi-detached (17); Maisonette, mid-terrace (8). Built: 1950-1966 (81); 1967-1975 (9); 1996-2002 (6). Tenure at assessment: rented (social) (38); owner-occupied (29); rented (private) (19).
Each home's certificates and sales (53 addresses)
- 1 Convent Road
- 1, Abbey Gardens
- 3, Abbey Gardens
- 5, Abbey Gardens
- 12, Convent Road
- 17, Convent Road
- 20, Convent Road
- 22, Convent Road
- 27, Convent Road
- 31, Convent Road
- 35a, Convent Road
- 40, Convent Road
- 43, Convent Road
- 44, Convent Road
- 45, Convent Road
- 46, Convent Road
- 48, Convent Road
- 49, Convent Road
- 50, Convent Road
- 53, Convent Road
- 55, Convent Road
- 56, Convent Road
- 58, Convent Road
- 59, Convent Road
- 60, Convent Road
- 61, Convent Road
- 62, Convent Road
- 67, Convent Road
- 69, Convent Road
- 73, Convent Road
- 75, Convent Road
- 77, Convent Road
- 79, Convent Road
- 81, Convent Road
- 84, Convent Road
- 88, Convent Road
- 91, Convent Road
- 92, Convent Road
- 94, Convent Road
- 104, Convent Road
- 107, Convent Road
- 111, Convent Road
- 121a, Convent Road
- 123a, Convent Road
- 127a, Convent Road
- 129a, Convent Road
- 131a, Convent Road
- 133a, Convent Road
- Flat 8 Beaufort House, Convent Road
- Flat 10 Beaufort House, Convent Road
- Flat 11 Beaufort House, Convent Road
- Flat 12 Beaufort House, Convent Road
- Flat 14 Beaufort House, Convent Road
Council tax
What each band costs in Spelthorne in 2026-27: Band D £2,526 a year on average, including the police, fire and any county and parish charges.
| A | B | C | D | E | F | G | H |
|---|---|---|---|---|---|---|---|
| £1,684 | £1,965 | £2,246 | £2,526 | £3,088 | £3,649 | £4,211 | £5,053 |
Homes by band in the neighbourhoods around this street: most are in band D (37% of about 1,240 homes).
Planning and heritage
- Conservation area: no postcode centre in this street's postcodes is in one.
- Listed buildings on or by this street: none.
- Article 4 direction (removing permitted development rights): none recorded, though not every council has published theirs.
- Tree preservation orders: none recorded, though not every council has published theirs.
- Green belt: no.
Brownfield land registered for housing within 1 km (0.6 miles)
- 28-44 Feltham Road, not permissioned (270 m)
- Fir Tree Place, Church Road, not permissioned (590 m (0.4 miles))
- Ashford Multi-storey car park, Church Road, Ashford, not permissioned (680 m (0.4 miles))
- 51-53 Church Road, permissioned (680 m (0.4 miles))
- Depot at Feltham Hill Road and Poplar Road, Ashford, not permissioned (690 m (0.4 miles))
- Depot at Feltham Hill Road and Poplar Road, not permissioned (690 m (0.4 miles))
- 158-166 Feltham Road, not permissioned (750 m (0.5 miles))
- 487 - 491 Staines Road West, permissioned (890 m (0.6 miles))
Roadworks
Finished in the last three months
- 20 August 2026: SURREY COUNTY COUNCIL, Highway repair and maintenance works, lane closure, on the footway, carriageway, verge (minor works)
Flood risk
Rivers, the sea or surface water: in this street's postcodes, 0 addresses are in areas at high risk, 6 at medium risk and 18 at low risk. Each address counts once, at the higher of its rivers-and-sea and surface-water risk.
Rivers and the sea alone: of the 24 homes the Environment Agency counts, 0 are in areas at high risk, 0 medium, 0 low and 7 very low.
High: 3.3% (1 in 30) or more chance of flooding a year. Medium: 1% to 3.3%. Low: 0.1% to 1%. Very low: under 0.1%. The rivers and sea figures allow for flood defences. Counts cover whole postcodes, which can include other streets.
Flood zone for planning: no postcode centre on this street is in flood zone 2 or 3.
| Postcode | Planning zone | Addresses at high / medium / low risk | Groundwater |
|---|---|---|---|
| TW15 2EL | not in 2 or 3 | 0 / 0 / 6 | unlikely |
| TW15 2HW | not in 2 or 3 | 0 / 0 / 5 | unlikely |
| TW15 2HJ | not in 2 or 3 | 0 / 0 / 0 | unlikely |
| TW15 2EW | not in 2 or 3 | 0 / 3 / 0 | unlikely |
| TW15 2HN | not in 2 or 3 | 0 / 3 / 3 | unlikely |
| TW15 2HU | not in 2 or 3 | 0 / 0 / 0 | unlikely |
| TW15 2AQ | not in 2 or 3 | 0 / 0 / 4 | unlikely |
Height above sea level
The street's addresses are about 14 m above sea level.
Broadband
| Postcode | Superfast (30 Mbit/s+) | Ultrafast (300 Mbit/s+) | Gigabit | Below 10 Mbit/s |
|---|---|---|---|---|
| TW15 2AQ | 100% | 100% | 100% | 0% |
| TW15 2EL | 100% | 100% | 100% | 0% |
| TW15 2EW | 89% | 89% | 89% | 0% |
| TW15 2HJ | 100% | 100% | 100% | 0% |
| TW15 2HN | 100% | 100% | 100% | 0% |
| TW15 2HU | 100% | 100% | 100% | 0% |
| TW15 2HW | 97% | 97% | 97% | 0% |
Getting around
| Nearest | Distance | |
|---|---|---|
| Railway stations | Ashford (Surrey) 882,000 journeys in 2024–25 | 1.2 km (0.8 miles) |
| Upper Halliford 106,000 journeys in 2024–25 | 2.5 km (1.5 miles) | |
| Sunbury 391,000 journeys in 2024–25 | 2.8 km (1.8 miles) | |
| Bus stops | 14 stops within 400 m (0.2 miles), 23 within 800 m (0.5 miles); nearest The Ash Tree Ashford | 30 m |
| Bus or coach station | Heathrow Terminal 4 (Rail-Air) Heathrow Airport Terminal 4 | 3.3 km (2 miles) |
| Ferry terminal | Sunbury Ferry Landing | 4.4 km (2.7 miles) |
| Car parks | Apcoa | 2.2 km (1.4 miles) |
| EV charging points | 15 within 1.6 km (1 mile); nearest Muncaster Road | 100 m |
| Airport with scheduled flights | London Heathrow Airport LHR | 4.5 km (2.8 miles) |
Local services
| Nearest | Distance | |
|---|---|---|
| GP surgeries | 4 practices within 1.6 km (1 mile); nearest The Orchard Surgery | 200 m |
| Pharmacies | 6 pharmacies within 1.6 km (1 mile); nearest Fastheal Pharmacy Ashford | 170 m |
| NHS dentists | 4 practices within 1.6 km (1 mile); nearest Cornerhouse Dental Practice | 350 m |
| Hospital | Ashford Hospital | 2 km (1.3 miles) |
| Police station | Staines Police Station | 3.6 km (2.2 miles) |
| Cash machines | MFG - Herds Garage Filling Station Cashzone | 1 km (0.6 miles) |
Parks and green space
| Nearest | Distance | |
|---|---|---|
| Park or garden | Unnamed 9,540 m² | 850 m (0.5 miles) |
| Play area | 1 within 800 m (0.5 miles); nearest Unnamed 9,220 m² | 480 m (0.3 miles) |
| Playing field | 1 within 800 m (0.5 miles); nearest Unnamed 4.7 ha | 430 m (0.3 miles) |
| Allotments | 1 within 800 m (0.5 miles); nearest Ashford Smallholders Allotment Gardens 3.3 ha | 480 m (0.3 miles) |
Landmarks
3 listed buildings are within 1 km (0.6 miles).
| Name | What it is | From the middle of the street |
|---|---|---|
| Queen Mary Reservoir | Lake or reservoir | 1.7 km (1 mile) south |
| Bedfont Lake | Lake or reservoir | 2.1 km (1.3 miles) north-east |
| Round Copse | Wood | 2.4 km (1.5 miles) south-west |
| Laleham Pond | Lake or reservoir | 2.7 km (1.7 miles) south-west |
| Shortwood Pond | Lake or reservoir | 2.8 km (1.8 miles) west |
| Penton Hook Island | Island | 3.9 km (2.4 miles) south-west |
Air quality
| Pollutant | Here | UK limit | WHO guideline |
|---|---|---|---|
| Nitrogen dioxide (NO2) | 15.2 | 40 | 10 |
| Fine particles (PM2.5) | 7.8 | 20 | 5 |
| Particles (PM10) | 12.0 | 40 | 15 |
All three are within the UK legal limits; nitrogen dioxide and PM2.5 are above the WHO guideline, as in most towns and cities.
Road, rail and aircraft noise
| Level | Road traffic | Railways | Aircraft |
|---|---|---|---|
| 70 to 74 | 1 | 0 | 0 |
| 65 to 69 | 25 | 0 | 0 |
| 60 to 64 | 94 | 0 | 0 |
| 55 to 59 | 20 | 0 | 0 |
| Under 55 | 28 | 168 | 168 |
140 of the street's 168 addresses are modelled at 55 dB or more from road traffic, above the WHO guidelines.
Climate, daylight and earthquakes
Monthly temperatures and rainfall, sunrise and sunset through the year, and earthquakes recorded nearby since 1970 are much the same across the area, so they are worked out once for Spelthorne: see them on the Spelthorne page.
Nearest schools
| School | Phase | Ages | Distance | Inspection |
|---|---|---|---|---|
| St Michael Catholic Primary School & Nursery Roman Catholic | Primary | 2–11 | 330 m | Outstanding (May 2024, overall grade under the previous framework) |
| The Echelford Primary School | Primary | 4–11 | 410 m (0.3 miles) | Report card (Apr 2026): Curriculum and teaching: Expected standard; Achievement: Expected standard; Attendance and behaviour: Expected standard; Personal development and wellbeing: Strong standard; Inclusion: Expected standard; Leadership and governance: Expected standard; Early years: Strong standard; Safeguarding standards: Met |
| Ashford CofE Primary School Church of England | Primary | 4–11 | 430 m (0.3 miles) | Good (Sep 2023, overall grade under the previous framework) |
| Clarendon Primary School | Primary | 2–11 | 1.1 km (0.7 miles) | No published inspection |
| Meadhurst Primary School | Primary | 2–11 | 1.3 km (0.8 miles) | Good (Jan 2023, overall grade under the previous framework) |
| Thomas Knyvett College | Secondary | 11–16 | 1.6 km (1 mile) | Report card (Jun 2026): Curriculum and teaching: Needs attention; Achievement: Needs attention; Attendance and behaviour: Needs attention; Personal development and wellbeing: Needs attention; Inclusion: Needs attention; Leadership and governance: Expected standard; Safeguarding standards: Met |
| Ashford Park Primary School | Primary | 4–11 | 2 km (1.2 miles) | Good (Feb 2024, overall grade under the previous framework) |
Food hygiene ratings nearby
| Business | Type | Distance | Rating | Rated |
|---|---|---|---|---|
| Foodfare Superstore TW15 2HW | Retailers - other | 110 m | 5 Very good | 25 Nov 2025 |
| JK's Fish & Chips TW15 2BX | Takeaway/sandwich shop | 170 m | 4 Good | 17 Apr 2025 |
| Ashford Food Local TW15 2BX | Retailers - other | 170 m | 1 Major improvement necessary | 18 Mar 2025 |
| Nisa Local TW15 1DQ | Retailers - other | 310 m | 5 Very good | 24 Apr 2023 |
| Ashford Charcoal Grill TW15 1DQ | Restaurant/Cafe/Canteen | 310 m | 5 Very good | 8 Nov 2024 |
| Kings Head TW15 2EB | Pub/bar/nightclub | 320 m | 5 Very good | 10 Dec 2024 |
| Salt And Vinegar TW15 1DB | Restaurant/Cafe/Canteen | 330 m | 5 Very good | 2 Sep 2026 |
| The Corner Shop TW15 1DB | Retailers - other | 330 m | 4 Good | 9 Jul 2025 |
| Chaii Coffee TW15 2UG | Restaurant/Cafe/Canteen | 330 m | 5 Very good | 3 Feb 2026 |
| Oscahs At Ashford Church Of England School TW15 2BW | School/college/university | 350 m | 5 Very good | 10 Mar 2026 |
| Ashford C Of E Primary School TW15 2BW | School/college/university | 350 m | 5 Very good | 1 Jul 2025 |
| IFG Group Trading As Dolce Ltd@ Echelford Primary School TW15 1EX | School/college/university | 400 m (0.2 miles) | 3 Generally satisfactory | 15 Sep 2026 |
| Breakfast Club/After School Club At Echelford Primary School TW15 1EX | School/college/university | 430 m (0.3 miles) | 4 Good | 5 Mar 2025 |
| The Freeman Arms TW15 1BS | Pub/bar/nightclub | 440 m (0.3 miles) | 5 Very good | 2 Jul 2026 |
| Ashford Supermarket (Londis) TW15 1BS | Retailers - other | 440 m (0.3 miles) | 5 Very good | 5 Nov 2024 |
Crime within 250 m
| Category | Crimes |
|---|---|
| Violence and sexual offences | 41 |
| Shoplifting | 32 |
| Public order | 17 |
| Anti-social behaviour | 14 |
| Robbery | 9 |
| Vehicle crime | 6 |
| Criminal damage and arson | 5 |
| Other crime | 4 |
| Other theft | 3 |
| Burglary | 2 |
| Theft from the person | 1 |
| Drugs | 1 |
Most of these are attached to: On or near Elm Tree Close (62); On or near Bancroft Close (12); On or near St Michaels Road (12); On or near Town Tree Road (9); On or near B377 (9).
People and work
Who lives here
| Around this street | England | |
|---|---|---|
| Median age | 37 | 40 |
| Children under 15 | 21% | 17% |
| Aged 65 and over | 13% | 18% |
Homes
| Around this street | England | |
|---|---|---|
| Owned (outright or with a mortgage) | 45% | 61% |
| Owned outright | 18% | 33% |
| Shared ownership | under 1% | 1% |
| Social rented | 36% | 17% |
| Private rented | 18% | 21% |
Work and commuting
| Around this street | England | |
|---|---|---|
| Adults (16 and over) in work | 60% | 57% |
| Unemployment (of those working or looking for work) | 6% | 6% |
| Retired (of adults) | 17% | 22% |
| Long-term sick or disabled (of adults) | 6% | 4% |
| Work mainly from home (of those in work) | 28% | 32% |
| Travel to work by car or van | 54% | 48% |
| By train, Underground, metro or tram | 3% | 4% |
| By any public transport, including bus | 9% | 8% |
| On foot or by bicycle | 7% | 10% |
| Work within 10 km (6 miles) of home (of those who travel to work) | 77% | 65% |
| Work 30 km (19 miles) or more away | 4% | 8% |
Education and languages
| Around this street | England | |
|---|---|---|
| Degree or other higher qualification, Level 4+ (of adults) | 23% | 34% |
| No qualifications | 22% | 18% |
| Apprenticeship as highest qualification | 5% | 5% |
| Main language English (aged 3 and over) | 91% | 91% |
| Cannot speak English well or at all | 1% | 2% |
Deprivation
The 2 neighbourhoods around this street are in deciles 3 to 7 of 10 on the English Indices of Deprivation 2025, where 1 is the most deprived tenth of England's 33,755 neighbourhoods and 10 the least.
What has changed
Nothing new since the change feed started on 30 October 2026. New sales and energy certificates, and hygiene ratings, school inspections and flood figures nearby, will be listed here as the sources update.
Postcodes on this street
- TW15 2EL: 40 addresses of 41 in the postcode
- TW15 2HW: 39 addresses of 40 in the postcode
- TW15 2HJ: 23 addresses of 24 in the postcode
- TW15 2EW: 19 addresses of 20 in the postcode
- TW15 2HN: 19 addresses of 21 in the postcode
- TW15 2HU: 16 addresses of 17 in the postcode
- TW15 2AQ: 12 addresses of 13 in the postcode
Nearby streets
Convent Road · Hawley Way · Elm Tree Close · Muncaster Road · Abbey Gardens · St Michaels Road · Feltham Hill Road · Feltham Road · Oakfield Road · Bancroft Close · Barn Close · Linkscroft Avenue
All the streets in TW15 and across Spelthorne.
What this page cannot tell you
- Whether a particular house is at risk of flooding, subsiding or anything else: the flood map is a model of areas and there is no property-level data here.
- What a home is worth now: sales are historic prices for the homes that happened to sell.
- How safe the street is: crime points are moved to anonymised locations and many crimes are never reported.
- Whether you would get a place at a school: distances are straight lines, not catchments.
- Who lives on the street now: census figures describe the small areas around it in March 2021, during a lockdown.
- How long a journey takes or how often anything runs: transport distances are straight lines to the nearest stops.
- Whether a GP practice is taking new patients, or a dentist new NHS patients.
- How loud a home is inside, or noise from industry, neighbours or smaller airfields: noise figures are models of road, rail and air traffic outside.
How each figure on this page is matched to the street and worked out: methodology.