{"id":168,"date":"2026-03-11T14:24:17","date_gmt":"2026-03-11T14:24:17","guid":{"rendered":"https:\/\/pavingestimator.com\/blog\/?p=168"},"modified":"2026-03-11T14:44:16","modified_gmt":"2026-03-11T14:44:16","slug":"cost-to-expand-driveway","status":"publish","type":"post","link":"https:\/\/pavingestimator.com\/blog\/cost-to-expand-driveway\/","title":{"rendered":"How Much to Expand a Driveway? 2026 Pricing &amp; Cost Calculator"},"content":{"rendered":"\n<script src=\"https:\/\/cdn.tailwindcss.com\"><\/script>\n<style>\n  @import url('https:\/\/fonts.googleapis.com\/css2?family=Inter:wght@400;600;700;800&display=swap');\n  body { font-family: 'Inter', sans-serif; }\n<\/style>\n\n<article class=\"max-w-4xl mx-auto px-4 py-12 text-slate-800 leading-relaxed font-inter\">\n  \n  <header class=\"mb-10 text-center border-b border-slate-200 pb-10\">\n    <span class=\"bg-blue-100 text-blue-900 text-xs font-bold px-3 py-1 rounded-full uppercase tracking-wide mb-4 inline-block\">2026 DRIVEWAY EXPANSION GUIDE<\/span>\n    <h1 class=\"text-4xl md:text-5xl font-extrabold text-slate-900 mb-6\">\n      Cost to Expand a Driveway: <br class=\"hidden md:block\" \/>\n      <span class=\"text-transparent bg-clip-text bg-gradient-to-r from-blue-700 to-slate-600\">(Asphalt, Concrete, or Gravel)<\/span>\n    <\/h1>\n    <p class=\"text-xl text-slate-600 max-w-3xl mx-auto\">\n      Adding space for a second vehicle or an RV? A paving engineer breaks down the true cost to widen your driveway and the hidden geotechnical challenges.\n    <\/p>\n  <\/header>\n\n  <div class=\"relative w-full h-[350px] md:h-[500px] mb-12 rounded-2xl overflow-hidden shadow-2xl border border-slate-200 group\">\n    <img decoding=\"async\" src=\"https:\/\/pavingestimator.com\/blog\/wp-content\/uploads\/2026\/03\/How-Much-to-Expand-a-Driveway.png\" \n         alt=\"Construction crew expanding an existing asphalt driveway to add a third parking lane\" \n         class=\"w-full h-full object-cover object-center transition-transform duration-700 group-hover:scale-105\">\n    \n    <div class=\"absolute bottom-0 left-0 right-0 bg-gradient-to-t from-slate-900\/95 via-slate-900\/60 to-transparent p-8 pt-24\">\n      <div class=\"flex items-center text-white space-x-4\">\n        <span class=\"bg-blue-600 text-xs font-bold px-2 py-1 rounded shadow-sm\">ENGINEERING ANALYSIS<\/span>\n        <span class=\"font-medium text-sm md:text-base drop-shadow-md\">Matching the base depth is critical for expansion.<\/span>\n      <\/div>\n    <\/div>\n  <\/div>\n\n  <div class=\"prose prose-lg max-w-none text-slate-700 mb-16\">\n    <p class=\"lead text-2xl font-light text-slate-900 mb-6\">\n      Driveway expansion projects are incredibly common. Homeowners frequently need to add a second vehicle, extend their garages, or create dedicated parking space for an RV or boat. \n    <\/p>\n    <p>\n      However, from a paving engineer&#8217;s perspective, widening a driveway is not as simple as pouring new material next to the old. The actual <strong>cost to expand a driveway<\/strong> depends heavily on the driveway material, base preparation requirements, drainage design, and mandatory excavation depth. \n    <\/p>\n    <p>\n      Before requesting bids, you must understand the foundational principles of pavement design. I strongly recommend reviewing our breakdown of <a href=\"https:\/\/pavingestimator.com\/blog\/how-much-does-paving-a-driveway-cost\/\" class=\"text-blue-600 font-bold hover:underline\">How Much Does Paving a Driveway Cost<\/a> and exploring <a href=\"https:\/\/pavingestimator.com\/blog\/the-master-paving-guide\/\" class=\"text-blue-600 font-bold hover:underline\">The Master Paving Guide<\/a> for general construction knowledge.\n    <\/p>\n  <\/div>\n\n  <div class=\"mb-16\">\n    <h2 class=\"text-3xl font-bold text-slate-900 mb-6 border-l-4 border-blue-700 pl-4\">Average Cost to Expand a Driveway<\/h2>\n    <p class=\"mb-6 text-slate-600\">\n      The cost to widen your driveway is primarily dictated by the surface material you choose. Below is the 2026 engineered pricing baseline.\n    <\/p>\n    \n    <div class=\"overflow-x-auto rounded-xl border border-slate-200 shadow-sm mb-6\">\n      <table class=\"w-full text-left border-collapse min-w-[500px]\">\n        <thead class=\"bg-slate-900 text-white\">\n          <tr>\n            <th class=\"p-4\">Material<\/th>\n            <th class=\"p-4\">Cost per Sq. Ft.<\/th>\n          <\/tr>\n        <\/thead>\n        <tbody class=\"divide-y divide-slate-100 text-sm font-medium text-slate-700\">\n          <tr class=\"bg-white hover:bg-slate-50\">\n            <td class=\"p-4 font-bold text-slate-900\">Gravel (Crushed Stone)<\/td>\n            <td class=\"p-4 text-emerald-700 font-bold\">$2.00 \u2013 $6.00<\/td>\n          <\/tr>\n          <tr class=\"bg-slate-50 hover:bg-slate-100\">\n            <td class=\"p-4 font-bold text-slate-900\">Hot Mix Asphalt<\/td>\n            <td class=\"p-4 text-blue-700 font-bold\">$5.00 \u2013 $12.00<\/td>\n          <\/tr>\n          <tr class=\"bg-white hover:bg-slate-50\">\n            <td class=\"p-4 font-bold text-slate-900\">Poured Concrete<\/td>\n            <td class=\"p-4 text-slate-700 font-bold\">$8.00 \u2013 $18.00<\/td>\n          <\/tr>\n        <\/tbody>\n      <\/table>\n    <\/div>\n\n    <div class=\"bg-slate-50 border border-slate-200 p-6 rounded-xl\">\n        <h4 class=\"font-bold text-slate-900 mb-3\">Expansion Estimate Example:<\/h4>\n        <p class=\"text-slate-700 text-sm\">\n            If you need to add a 10&#8242; x 30&#8242; parking pad (300 sq. ft.) alongside your existing driveway, the typical cost range will be <strong>$1,500 to $5,400<\/strong>, depending on the material selected and the required excavation depth. For a deep dive into material differences, read our <a href=\"https:\/\/pavingestimator.com\/blog\/asphalt-vs-concrete-driveway-cost\/\" class=\"text-blue-600 font-bold hover:underline\">Asphalt vs Concrete Driveway Cost Comparison<\/a>.\n        <\/p>\n    <\/div>\n  <\/div>\n\n  <div class=\"mb-16\">\n    <h2 class=\"text-3xl font-bold text-slate-900 mb-6\">Cost to Expand an Asphalt Driveway<\/h2>\n    <p class=\"text-slate-700 mb-4\">\n        Expanding an asphalt driveway requires a strict engineering process to prevent a &#8220;cold joint&#8221; failure where the old and new asphalt meet. The process includes:\n    <\/p>\n    <ol class=\"list-decimal list-inside space-y-2 text-slate-700 mb-6 bg-white p-6 rounded-xl border border-slate-200 shadow-sm\">\n        <li><strong>Excavation:<\/strong> Digging down past the topsoil to stable dirt.<\/li>\n        <li><strong>Base Preparation:<\/strong> Installing and compacting a new aggregate stone base to match the existing driveway&#8217;s depth.<\/li>\n        <li><strong>Asphalt Paving:<\/strong> Laying the hot mix flush with the existing surface.<\/li>\n        <li><strong>Compaction:<\/strong> Using a vibratory roller to fuse the &#8220;seam&#8221; together.<\/li>\n    <\/ol>\n    <p class=\"text-sm text-slate-600\">\n        Local labor rates and environmental regulations heavily influence this cost. See our regional pricing guides for <a href=\"https:\/\/pavingestimator.com\/blog\/how-much-is-asphalt-per-square-foot-in-texas\/\" class=\"text-blue-600 font-bold hover:underline\">Texas<\/a>, <a href=\"https:\/\/pavingestimator.com\/blog\/asphalt-driveway-cost-florida\/\" class=\"text-blue-600 font-bold hover:underline\">Florida<\/a>, and <a href=\"https:\/\/pavingestimator.com\/blog\/asphalt-driveway-cost-california\/\" class=\"text-blue-600 font-bold hover:underline\">California<\/a>.\n    <\/p>\n  <\/div>\n\n  <div class=\"mb-16 bg-slate-50 p-8 rounded-xl border border-slate-200\">\n    <h2 class=\"text-3xl font-bold text-slate-900 mb-4\">Cost to Expand a Gravel Driveway<\/h2>\n    <p class=\"text-slate-700 mb-6\">\n        Gravel offers distinct advantages for expansion projects: it requires the easiest installation, boasts a low material cost, and provides a highly flexible design that easily blends with the existing surface.\n    <\/p>\n    <p class=\"text-sm text-slate-600 mb-4\">\n        To properly engineer a gravel extension, review the <a href=\"https:\/\/pavingestimator.com\/blog\/gravel-driveway-cost-types\/\" class=\"text-blue-600 font-bold hover:underline\">Gravel Driveway Cost Types<\/a> and see how freeze-thaw climates impact base depth in our <a href=\"https:\/\/pavingestimator.com\/blog\/gravel-driveway-cost-ohio\/\" class=\"text-blue-600 font-bold hover:underline\">Ohio Gravel Guide<\/a>. If you are taking on the project yourself, follow our step-by-step <a href=\"https:\/\/pavingestimator.com\/blog\/how-to-install-gravel-driveway-diy-guide\/\" class=\"text-blue-600 font-bold hover:underline\">DIY Installation Guide<\/a>.\n    <\/p>\n  <\/div>\n\n  <div class=\"mb-16\">\n    <h2 class=\"text-3xl font-bold text-slate-900 mb-6\">Engineering Challenges When Expanding a Driveway<\/h2>\n    <p class=\"text-slate-700 mb-6\">\n        A poorly executed expansion will look terrible and fail quickly. Contractors must mitigate these technical problems:\n    <\/p>\n    <div class=\"grid grid-cols-1 md:grid-cols-2 gap-6 mb-6\">\n        <div class=\"border border-slate-200 p-5 rounded-lg bg-white shadow-sm\">\n            <h4 class=\"font-bold text-red-600 mb-2\">Base Mismatch<\/h4>\n            <p class=\"text-sm text-slate-600\">If the new aggregate base is shallower than the old one, the new section will sink under vehicle weight.<\/p>\n        <\/div>\n        <div class=\"border border-slate-200 p-5 rounded-lg bg-white shadow-sm\">\n            <h4 class=\"font-bold text-red-600 mb-2\">Drainage Slope<\/h4>\n            <p class=\"text-sm text-slate-600\">The expanded area must maintain a minimum 2% cross-slope so water doesn&#8217;t pool on the seam.<\/p>\n        <\/div>\n        <div class=\"border border-slate-200 p-5 rounded-lg bg-white shadow-sm\">\n            <h4 class=\"font-bold text-red-600 mb-2\">Edge Cracking<\/h4>\n            <p class=\"text-sm text-slate-600\">Without proper edge compaction on the new outer boundary, the asphalt will crumble over time.<\/p>\n        <\/div>\n        <div class=\"border border-slate-200 p-5 rounded-lg bg-white shadow-sm\">\n            <h4 class=\"font-bold text-red-600 mb-2\">Differential Settlement<\/h4>\n            <p class=\"text-sm text-slate-600\">New soil settles differently than dirt that has been packed down for 20 years.<\/p>\n        <\/div>\n    <\/div>\n    <p class=\"text-sm text-slate-600\">\n        Review the <a href=\"https:\/\/pavingestimator.com\/blog\/residential-asphalt-paving-guide\/\" class=\"text-blue-600 font-bold hover:underline\">Residential Asphalt Paving Guide<\/a> and the <a href=\"https:\/\/pavingestimator.com\/blog\/asphalt-thickness-calculator-guide\/\" class=\"text-blue-600 font-bold hover:underline\">Asphalt Thickness Calculator Guide<\/a> to understand proper structural mitigation.\n    <\/p>\n  <\/div>\n\n  <div class=\"bg-slate-900 text-white rounded-2xl p-8 md:p-12 mb-16 shadow-2xl relative overflow-hidden\">\n    <div class=\"absolute top-0 right-0 p-6 opacity-10 text-8xl\">\ud83d\udcd0<\/div>\n    <h2 class=\"text-3xl font-bold text-blue-400 mb-8 relative z-10\">Case Study: Asphalt Driveway Expansion<\/h2>\n    \n    <div class=\"grid grid-cols-2 md:grid-cols-4 gap-4 mb-8 border-b border-slate-700 pb-6 relative z-10\">\n        <div><strong class=\"block text-xs text-slate-400 uppercase\">Location<\/strong> <span class=\"font-bold text-white\">Suburban<\/span><\/div>\n        <div><strong class=\"block text-xs text-slate-400 uppercase\">Original Size<\/strong> <span class=\"font-bold text-white\">700 sq ft<\/span><\/div>\n        <div><strong class=\"block text-xs text-slate-400 uppercase\">Expansion<\/strong> <span class=\"font-bold text-emerald-400\">+320 sq ft<\/span><\/div>\n        <div><strong class=\"block text-xs text-slate-400 uppercase\">Total Cost<\/strong> <span class=\"font-bold text-white\">$3,850<\/span><\/div>\n    <\/div>\n    \n    <div class=\"grid grid-cols-1 md:grid-cols-2 gap-8 relative z-10\">\n        <div>\n            <h4 class=\"font-bold text-white mb-3 text-lg\">Process:<\/h4>\n            <ul class=\"list-disc list-inside text-sm text-slate-300 space-y-2\">\n                <li>Excavate 8 inches of topsoil and clay.<\/li>\n                <li>Install and compact new aggregate base.<\/li>\n                <li>Pave 3 inches of compacted asphalt to match the old driveway.<\/li>\n            <\/ul>\n        <\/div>\n        <div>\n            <div class=\"bg-blue-900\/30 p-4 rounded-xl border border-blue-500 text-sm\">\n                <span class=\"block text-blue-300 font-bold mb-1\">Engineer&#8217;s Conclusion:<\/span>\n                <span class=\"text-white\">Matching the base depth precisely was essential in this project to avoid differential settlement along the longitudinal seam. The transition is seamless.<\/span>\n            <\/div>\n        <\/div>\n    <\/div>\n  <\/div>\n\n  <div class=\"mb-16\">\n    <h2 class=\"text-3xl font-bold text-slate-900 mb-4\">Material Calculation for Driveway Expansion<\/h2>\n    <p class=\"text-slate-700 mb-6\">\n        If you are budgeting for an expansion, estimating materials requires three exact metrics: area calculation (length \u00d7 width), desired compacted thickness, and asphalt density (approx. 145 lbs\/ft\u00b3). \n    <\/p>\n    <p class=\"text-slate-700 mb-6\">\n        Do not guess your tonnage. Follow the math in the <a href=\"https:\/\/pavingestimator.com\/blog\/asphalt-tonnage-calculator-formula-guide\/\" class=\"text-blue-600 font-bold hover:underline\">Asphalt Tonnage Calculator Formula Guide<\/a> or use our step-by-step walkthrough: <a href=\"https:\/\/pavingestimator.com\/blog\/how-do-i-calculate-how-much-asphalt-i-need\/\" class=\"text-blue-600 font-bold hover:underline\">How Do I Calculate How Much Asphalt I Need<\/a>.\n    <\/p>\n  <\/div>\n\n  <div class=\"mb-16 bg-slate-50 p-8 rounded-xl border border-slate-200\">\n    <h2 class=\"text-2xl font-bold text-slate-900 mb-4\">When Repaving Is Better Than Expansion<\/h2>\n    <p class=\"text-slate-700 text-sm mb-4\">\n        Sometimes, widening a driveway exposes severe structural problems in the old pavement. If your original driveway is heavily oxidized, severely cracked, or nearing the end of its 20-year lifespan, adding a new pristine section next to it will highlight how bad the old section looks.\n    <\/p>\n    <p class=\"text-slate-700 text-sm\">\n        In these cases, completing the expansion and then repaving the entire driveway (overlay) is a better long-term aesthetic and structural solution. See the <a href=\"https:\/\/pavingestimator.com\/blog\/cost-to-repave-asphalt-driveway\/\" class=\"text-blue-600 font-bold hover:underline\">Cost to Repave an Existing Asphalt Driveway<\/a>.\n    <\/p>\n  <\/div>\n<div class=\"bg-gray-100 border-l-4 border-gray-500 p-4 my-6 rounded\">\n  <p class=\"text-sm leading-relaxed\">\n    Before repaving an existing asphalt driveway, it is important to verify whether a local \n    construction permit is required. In many municipalities, resurfacing or structural repairs \n    that modify driveway width, drainage flow, or curb access must be approved by the city or \n    county engineering department. Permit fees are usually small compared to the overall paving \n    cost, but failing to obtain one can lead to project delays or municipal fines. If you are not \n    sure whether your repaving project requires approval, review our detailed guide on \n    <a href=\"https:\/\/pavingestimator.com\/blog\/driveway-paving-permit-cost\/\" class=\"text-blue-600 font-semibold underline\">\n      driveway paving permit costs and requirements\n    <\/a> to understand when permits are required before resurfacing or reconstructing an asphalt driveway.\n  <\/p>\n<\/div>\n  <div class=\"mb-16\">\n    <h2 class=\"text-2xl font-bold text-slate-900 mb-4\">When Asphalt Removal Is Required<\/h2>\n    <p class=\"text-slate-700 text-sm\">\n        If portions of your old pavement or existing concrete walkways interfere with the new expansion footprint, heavy demolition is required. Ensure you budget for the machinery and disposal fees associated with this step. Learn more about the demolition phase in our guide on <a href=\"https:\/\/pavingestimator.com\/blog\/asphalt-removal-cost-per-square-foot\/\" class=\"text-blue-600 font-bold hover:underline\">Asphalt Removal Cost Per Square Foot<\/a>.\n    <\/p>\n  <\/div>\n\n  <div class=\"mb-16\">\n    <h2 class=\"text-2xl font-bold text-slate-900 mb-4\">Maintenance After Driveway Expansion<\/h2>\n    <p class=\"text-slate-700 text-sm mb-4\">\n        The most vulnerable part of an expanded driveway is the &#8220;seam&#8221; where the new material meets the old. Water intrusion here will cause the joint to split during freeze-thaw cycles. \n    <\/p>\n    <p class=\"text-slate-700 text-sm\">\n        Applying a commercial-grade sealcoat over the entire driveway (both old and new sections) will protect the joint and unify the color. Read our analysis on <a href=\"https:\/\/pavingestimator.com\/blog\/asphalt-sealcoating-cost-spray-vs-squeegee\/\" class=\"text-blue-600 font-bold hover:underline\">Asphalt Sealcoating Cost: Spray vs Squeegee<\/a>.\n    <\/p>\n  <\/div>\n\n  <div class=\"text-center py-12 bg-blue-900 rounded-2xl shadow-xl relative overflow-hidden\">\n    <h2 class=\"text-3xl font-bold text-white mb-4 relative z-10\">Calculate Your Expansion Tonnage<\/h2>\n    <p class=\"text-blue-100 mb-8 max-w-lg mx-auto relative z-10\">\n      Stop guessing material costs. Input your planned expansion dimensions into our calculator to get exact tonnage and pricing estimates.\n    <\/p>\n    <a href=\"https:\/\/pavingestimator.com\" class=\"inline-flex items-center justify-center px-10 py-5 text-lg font-bold text-blue-900 transition-all duration-200 bg-white rounded-lg hover:bg-slate-100 shadow-lg transform hover:-translate-y-1 relative z-10\">\n      <span>START CALCULATOR<\/span>\n      <svg class=\"w-5 h-5 ml-2\" fill=\"none\" stroke=\"currentColor\" viewBox=\"0 0 24 24\"><path stroke-linecap=\"round\" stroke-linejoin=\"round\" stroke-width=\"2\" d=\"M9 7h6m0 10v-3m-3 3h.01M9 17h.01M9 14h.01M12 14h.01M15 11h.01M12 11h.01M9 11h.01M7 21h10a2 2 0 002-2V5a2 2 0 00-2-2H7a2 2 0 00-2 2v14a2 2 0 002 2z\"><\/path><\/svg>\n    <\/a>\n  <\/div>\n\n<\/article>\n","protected":false},"excerpt":{"rendered":"<p>2026 DRIVEWAY EXPANSION GUIDE Cost to Expand a Driveway: (Asphalt, Concrete, or Gravel) Adding space for a second vehicle or [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":169,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_uag_custom_page_level_css":"","site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"disabled","ast-breadcrumbs-content":"","ast-featured-img":"disabled","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[3],"tags":[],"class_list":["post-168","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-cost-guides"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>How Much to Expand a Driveway? 2026 Pricing &amp; Cost Calculator<\/title>\n<meta name=\"description\" content=\"Adding a parking pad? See the 2026 engineer&#039;s guide on the cost to expand a driveway ($2 - $18\/sq ft). We cover asphalt, concrete, and gravel expansion.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/pavingestimator.com\/blog\/cost-to-expand-driveway\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"How Much to Expand a Driveway? 2026 Pricing &amp; Cost Calculator\" \/>\n<meta property=\"og:description\" content=\"Adding a parking pad? See the 2026 engineer&#039;s guide on the cost to expand a driveway ($2 - $18\/sq ft). 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