H&K Group
Warren Asphalt
703 Route 57, Stewartsville, NJ 08886
- Hot mix (HMA)
- Checked Oct 28, 2026
Before you haul
What to settle with the plant before trucks leave the yard.
- Outside sales
- Confirm with plant
- Current hours
- Mon to Fri, 7 a.m. to 3 p.m.Posted — confirm today’s loadout
- Account
- Confirm with plantAsk what a first order needs
- Mix availability
- Call plantName the mix and tonnage
- Production schedule
- Call plantChanges day to day
- Minimum order
- Confirm with plant
- Payment methods
- Confirm with plant
- Saturday
- Not in posted hoursAsk about Saturday runs
- Truck access
- See site and truck access
Plant notes
Formerly Warren Materials, the plant has been part of H&K since 1999; H&K says the site first made asphalt in 1952. It sits off Route 78 on Route 57 in Warren County and is an approved recycling center for incoming RAP. Also filed in state air permit records as Warren Materials.
Production schedules, mix inventory and loadout conditions change day to day. Confirm the mix designation, tonnage and loadout time with the plant before you dispatch trucks.
Plant details
Plant
- Operator
- H&K Group
- Plant type
- Fixed · hot mix asphalt
- County
- Warren County
- State DOT
- Not yet checked against a DOT list
- Address
- 703 Route 57, Stewartsville, NJ 08886
- GPS coordinates
- 40.70358, -75.12405
- Website
- hkgroup.com
- Plant page
- The operator’s page for this plant
- EPA air permits
- NJ0000003404185006
- Details checked
- October 28, 2026
Ordering and sales
- Plant phone
- (908) 859-3333
- Sales department
- (610) 222-3042
- Outside sales
- Outside sales unconfirmed
Ask for your mix by name, the day’s loading hours, the minimum load, and what a first-time account needs.
Technical and lab
- Lab and technical notes
- H&K says all of its asphalt plants run recycled asphalt pavement (RAP) mix designs.
Operations
- Plant hours
- Monday to Friday, 7 a.m. to 3 p.m.; other times by arrangement
- Seasonal schedule
- H&K closes its asphalt plants each winter and announces opening dates each spring (most reopened between March 3 and March 31 in 2025). These are the plant's posted hours; production and last-load times still vary with paving demand and weather, so call before dispatching trucks.
Mixes and products
- HMA · listed
- RHMA · not listed, ask
- Warm mix · not listed, ask
- RAP · not listed, ask
- DOT spec · listed
- Specialty · listed
- Other · listed
Hot mix asphalt (HMA)
- Hot Mix Asphalt (HMA)
Agency and DOT specification mixes
- Marshall mixes
- Superpave mixes
Specialty and custom mixes
- Custom mixes
Other listed products
- NJDOT approved mixes
- PennDOT approved mixes
The operator’s own list, sorted into families by The Pavement Directory. Mix designs and production schedules change: confirm the exact mix designation and tonnage availability with the plant before dispatching trucks.
Price per ton
No price on file for Warren Asphalt yet. Plant prices move with the liquid asphalt index and the quantity, so call for today's price — and if you have been quoted or bought here recently, you can add the price below.
Report a price you were quoted or paid
Site and truck access
Google satellite imagery centred on the plant’s coordinates. Zoom out to see the roads in.
- Gate address
- 703 Route 57, Stewartsville, NJ 08886
- GPS
- 40.70358, -75.12405
Truck entrance, scale, staging and trailer limits are not on file for this plant yet. Ask when you call, and check the approach from above before sending trucks.
Nearby asphalt plants
5 other plants within a 30 min drive of Warren Asphalt, by road with typical traffic.
Route to 1. Phillipsburg Asphalt Plant — 3 min (1.7 mi) by road, typical traffic.
| Map number# | Plant | Drive | Road miles | Outside sales |
|---|---|---|---|---|
| 1 | Phillipsburg Asphalt PlantTilcon New York · Phillipsburg, NJ1.7 mi by road · Outside sales: UnconfirmedDirections from Warren Asphalt to Phillipsburg Asphalt Plant | 3 min | 1.7 mi | Unconfirmed |
| 2 | Easton AsphaltH&K Group · Easton, PA9.9 mi by road · Outside sales: UnconfirmedDirections from Warren Asphalt to Easton Asphalt | 17 min | 9.9 mi | Unconfirmed |
| 3 | Highway Materials Inc - NazarethNazareth, PA · permit record, not yet reviewed15 mi by road · Outside sales: UnconfirmedDirections from Warren Asphalt to Highway Materials Inc - Nazareth | 21 min | 15 mi | Unconfirmed |
| 4 | Heidelberg Materials LLCNazareth, PA · permit record, not yet reviewed16 mi by road · Outside sales: UnconfirmedDirections from Warren Asphalt to Heidelberg Materials LLC | 23 min | 16 mi | Unconfirmed |
| 5 | Stavola Materials Oldwick QuarryOldwick, NJ · permit record, not yet reviewed22 mi by road · Outside sales: UnconfirmedDirections from Warren Asphalt to Stavola Materials Oldwick Quarry | 29 min | 22 mi | Unconfirmed |
Drive time and miles by road from Google, with typical traffic for the route. Rush hour, a plant queue and a loaded truck all add time, so allow for them before you commit trucks.
Plant intelligence
About Warren Asphalt
Warren Asphalt is an H&K Group hot mix asphalt plant at 703 Route 57 in Stewartsville, New Jersey. H&K lists (908) 859-3333 as the plant line and (610) 222-3042 for its materials sales team. Listed hours: Monday to Friday, 7 a.m. to 3 p.m.; other times by arrangement. H&K closes its asphalt plants for winter, so call ahead to confirm the plant is open, mixes, pricing and loadout times.
More H&K Group plants
- Easton AsphaltEaston, PA · 17 min (9.9 mi) by road
- Coopersburg AsphaltCoopersburg, PA · 37 min (30 mi) by road
- Chalfont AsphaltChalfont, PA · 53 min (34 mi) by road
- Bechtelsville AsphaltBechtelsville, PA · 57 min (43 mi) by road
- Miller AsphaltRushland, PA · 1 hr 2 min (39 mi) by road
- Locust Ridge AsphaltPocono Lake, PA · 1 hr 2 min (55 mi) by road
Plan the haul
- How to use this directoryWhat to know before you call a plant.
- Asphalt tonnage calculatorTons to order before you call.
- Trucking calculatorCycle times and trucks for this haul.
- Haul PlannerRank plants by delivered cost for a job.
- Asphalt price per tonPlant price, trucking and delivered cost.
- Asphalt plants near StewartsvilleEvery plant within a haul of your site.
Who lays the mix
Need the work done rather than the mix? Compare paving and pavement maintenance contractors serving the area.
Warren Asphalt: common questions
How do I order asphalt from Warren Asphalt?
Call the sales department at (610) 222-3042. Have the mix, tonnage and pickup date ready, and ask what a first-time account needs.
What are Warren Asphalt's hours?
Monday to Friday, 7 a.m. to 3 p.m.; other times by arrangement. H&K closes its asphalt plants each winter and announces opening dates each spring (most reopened between March 3 and March 31 in 2025). These are the plant's posted hours; production and last-load times still vary with paving demand and weather, so call before dispatching trucks.
What asphalt mixes does Warren Asphalt make?
Warren Asphalt lists Hot Mix Asphalt (HMA), Marshall mixes, Superpave mixes, NJDOT approved mixes, PennDOT approved mixes and Custom mixes. What runs on a given day depends on the plant's schedule, so confirm your mix when you order.
Where is Warren Asphalt?
703 Route 57, Stewartsville, NJ 08886, in Warren County.
What other asphalt plants are near Stewartsville?
The closest by road in this directory are Phillipsburg Asphalt Plant in Phillipsburg (3 min (1.7 mi) by road), Easton Asphalt in Easton (17 min (9.9 mi) by road) and Highway Materials Inc - Nazareth in Nazareth (21 min (15 mi) by road), driving from Warren Asphalt with typical traffic. Call ahead before you switch plants: the nearest one only helps if it will load your trucks.
Who operates Warren Asphalt?
H&K Group operates Warren Asphalt.
Verified sources and corrections
Details checked October 28, 2026
Someone at The Pavement Directory checked this plant’s phone, hours and outside-sales policy against the operator on that date. It is not an endorsement of the plant or its mix.
Sources on this record
- Operator’s page for this plant — hkgroup.com
- Operator website — hkgroup.com
- EPA facility registry — Air permit NJ0000003404185006
Record last updated August 21, 2026.
Suggest an edit
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Confirm before you haul: Hours, mix availability, sales policy and DOT approvals change, sometimes week to week. Call the plant before you schedule trucks. The Pavement Directory is an independent directory and is not affiliated with H&K Group.